diff --git a/.travis.yml b/.travis.yml
index 46abbb9..7cfe0df 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,7 +14,6 @@
 env:
   - CONFIG=cpp
   - CONFIG=cpp_distcheck
-  - CONFIG=csharp
   - CONFIG=golang
   - CONFIG=java_jdk6
   - CONFIG=java_jdk7
@@ -52,10 +51,6 @@
       env: CONFIG=javanano_jdk7
     - os: osx
       env: CONFIG=javanano_oracle7
-    # Requires installing mono, currently travis.sh is doing that with apt-get
-    # which doesn't work on OS X.
-    - os: osx
-      env: CONFIG=csharp
     # Requires installing golang, currently travis.sh is doing that with apt-get
     # which doesn't work on OS X.
     - os: osx
@@ -70,6 +65,13 @@
       env: CONFIG=objectivec_osx
     - os: linux
       env: CONFIG=objectivec_cocoapods_integration
+  # The dotnet environment requires Ubuntu 14.04 or 16.04. This
+  # configuration is effectively an "extra" one, outside the
+  # autogenerated matrix.
+  include:
+    - os: linux
+      env: CONFIG=csharp
+      dist: trusty
   allow_failures:
     # These currently do not work on OS X but are being worked on by @haberman.
     - os: osx
diff --git a/Makefile.am b/Makefile.am
index 72cc914..80df335 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -59,22 +59,19 @@
   csharp/keys/README.md                                                      \
   csharp/protos/unittest_issues.proto                                        \
   csharp/src/AddressBook/AddPerson.cs                                        \
-  csharp/src/AddressBook/AddressBook.csproj                                  \
   csharp/src/AddressBook/Addressbook.cs                                      \
+  csharp/src/AddressBook/AddressBook.xproj                                   \
   csharp/src/AddressBook/ListPeople.cs                                       \
   csharp/src/AddressBook/Program.cs                                          \
-  csharp/src/AddressBook/Properties/AssemblyInfo.cs                          \
   csharp/src/AddressBook/SampleUsage.cs                                      \
-  csharp/src/AddressBook/app.config                                          \
-  csharp/src/Google.Protobuf.Conformance/App.config                          \
+  csharp/src/AddressBook/project.json                                        \
   csharp/src/Google.Protobuf.Conformance/Conformance.cs                      \
-  csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.csproj  \
+  csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.xproj   \
   csharp/src/Google.Protobuf.Conformance/Program.cs                          \
-  csharp/src/Google.Protobuf.Conformance/Properties/AssemblyInfo.cs          \
-  csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.csproj        \
+  csharp/src/Google.Protobuf.Conformance/project.json                        \
+  csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.xproj         \
   csharp/src/Google.Protobuf.JsonDump/Program.cs                             \
-  csharp/src/Google.Protobuf.JsonDump/Properties/AssemblyInfo.cs             \
-  csharp/src/Google.Protobuf.JsonDump/app.config                             \
+  csharp/src/Google.Protobuf.JsonDump/project.json                           \
   csharp/src/Google.Protobuf.Test/ByteStringTest.cs                          \
   csharp/src/Google.Protobuf.Test/CodedInputStreamExtensions.cs              \
   csharp/src/Google.Protobuf.Test/CodedInputStreamTest.cs                    \
@@ -87,13 +84,11 @@
   csharp/src/Google.Protobuf.Test/EqualityTester.cs                          \
   csharp/src/Google.Protobuf.Test/FieldCodecTest.cs                          \
   csharp/src/Google.Protobuf.Test/GeneratedMessageTest.cs                    \
-  csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj                \
+  csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.xproj                 \
   csharp/src/Google.Protobuf.Test/IssuesTest.cs                              \
   csharp/src/Google.Protobuf.Test/JsonFormatterTest.cs                       \
   csharp/src/Google.Protobuf.Test/JsonParserTest.cs                          \
   csharp/src/Google.Protobuf.Test/JsonTokenizerTest.cs                       \
-  csharp/src/Google.Protobuf.Test/Properties/AppManifest.xml                 \
-  csharp/src/Google.Protobuf.Test/Properties/AssemblyInfo.cs                 \
   csharp/src/Google.Protobuf.Test/Reflection/DescriptorsTest.cs              \
   csharp/src/Google.Protobuf.Test/Reflection/FieldAccessTest.cs              \
   csharp/src/Google.Protobuf.Test/Reflection/TypeRegistryTest.cs             \
@@ -110,7 +105,7 @@
   csharp/src/Google.Protobuf.Test/WellKnownTypes/DurationTest.cs             \
   csharp/src/Google.Protobuf.Test/WellKnownTypes/TimestampTest.cs            \
   csharp/src/Google.Protobuf.Test/WellKnownTypes/WrappersTest.cs             \
-  csharp/src/Google.Protobuf.Test/packages.config                            \
+  csharp/src/Google.Protobuf.Test/project.json                               \
   csharp/src/Google.Protobuf.sln                                             \
   csharp/src/Google.Protobuf/ByteArray.cs                                    \
   csharp/src/Google.Protobuf/ByteString.cs                                   \
@@ -124,8 +119,7 @@
   csharp/src/Google.Protobuf/Compatibility/TypeExtensions.cs                 \
   csharp/src/Google.Protobuf/FieldCodec.cs                                   \
   csharp/src/Google.Protobuf/FrameworkPortability.cs                         \
-  csharp/src/Google.Protobuf/Google.Protobuf.csproj                          \
-  csharp/src/Google.Protobuf/Google.Protobuf.nuspec                          \
+  csharp/src/Google.Protobuf/Google.Protobuf.xproj                           \
   csharp/src/Google.Protobuf/IDeepCloneable.cs                               \
   csharp/src/Google.Protobuf/IMessage.cs                                     \
   csharp/src/Google.Protobuf/InvalidJsonException.cs                         \
@@ -183,7 +177,7 @@
   csharp/src/Google.Protobuf/WellKnownTypes/Wrappers.cs                      \
   csharp/src/Google.Protobuf/WellKnownTypes/WrappersPartial.cs               \
   csharp/src/Google.Protobuf/WireFormat.cs                                   \
-  csharp/src/Google.Protobuf/packages.config                                 \
+  csharp/src/Google.Protobuf/project.json                                    \
   csharp/src/packages/repositories.config
 
 java_EXTRA_DIST=                                                                   \
diff --git a/appveyor.bat b/appveyor.bat
index 9a46b92..0e6dd52 100644
--- a/appveyor.bat
+++ b/appveyor.bat
@@ -19,9 +19,12 @@
 :build_csharp
 echo Building C#
 cd csharp\src
-nuget restore
-msbuild Google.Protobuf.sln /p:Platform="Any CPU" /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll" || goto error
-nunit-console Google.Protobuf.Test\bin\%configuration%\Google.Protobuf.Test.dll || goto error
+dotnet restore
+dotnet build -c %configuration% Google.Protobuf Google.Protobuf.Test Google.Protobuf.Conformance || goto error
+
+echo Testing C#
+dotnet test -c %configuration% Google.Protobuf.Test || goto error
+
 goto :EOF
 
 :error
diff --git a/appveyor.yml b/appveyor.yml
index c84ecae..ce797c6 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -14,10 +14,16 @@
 
     - language: csharp
 
+# Our build scripts run tests automatically; we don't want AppVeyor
+# to try to detect them itself.
+test: off
+
 install:
   - ps: Start-FileDownload https://googlemock.googlecode.com/files/gmock-1.7.0.zip
   - 7z x gmock-1.7.0.zip
   - rename gmock-1.7.0 gmock
+  - ps: Start-FileDownload https://go.microsoft.com/fwlink/?LinkID=809122 -FileName dotnetsdk.exe
+  - dotnetsdk.exe /install /quiet /norestart
 
 before_build:
   - if %platform%==Win32 set generator=Visual Studio 12
diff --git a/conformance/Makefile.am b/conformance/Makefile.am
index 5538cc7..78be9c8 100644
--- a/conformance/Makefile.am
+++ b/conformance/Makefile.am
@@ -246,7 +246,7 @@
 conformance-csharp: $(other_language_protoc_outputs)
 	@echo "Writing shortcut script conformance-csharp..."
 	@echo '#! /bin/sh' > conformance-csharp
-	@echo 'mono ../csharp/src/Google.Protobuf.Conformance/bin/Release/Google.Protobuf.Conformance.exe "$$@"' >> conformance-csharp
+	@echo 'dotnet ../csharp/src/Google.Protobuf.Conformance/bin/Release/netcoreapp1.0/Google.Protobuf.Conformance.dll "$$@"' >> conformance-csharp
 	@chmod +x conformance-csharp
 
 # Targets for actually running tests.
diff --git a/csharp/.gitignore b/csharp/.gitignore
index c88f741..8ba8849 100644
--- a/csharp/.gitignore
+++ b/csharp/.gitignore
@@ -1,16 +1,10 @@
-#
-# 	Untracked directories
-#
-src/AddressBook/bin
-src/AddressBook/obj
-src/Google.Protobuf/bin/
-src/Google.Protobuf/obj/
-src/Google.Protobuf.Conformance/bin/
-src/Google.Protobuf.Conformance/obj/
-src/Google.Protobuf.Test/bin/
-src/Google.Protobuf.Test/obj/
-src/Google.Protobuf.JsonDump/bin/
-src/Google.Protobuf.JsonDump/obj/
+# Output
+bin
+obj
+project.lock.json
+TestResult.xml
+
+# Possibly legacy now?
 mono/bin
 mono/tmp
 mono/protoc
@@ -23,6 +17,7 @@
 #
 # 	Untracked files
 #
+.vs
 *.user
 *.suo
 *.nupkg
diff --git a/csharp/build_packages.bat b/csharp/build_packages.bat
index 1502f06..37732e7 100644
--- a/csharp/build_packages.bat
+++ b/csharp/build_packages.bat
@@ -1,10 +1,7 @@
 @rem Builds Google.Protobuf NuGet packages
 
-@rem Adjust the location of nuget.exe
-set NUGET=C:\nuget\nuget.exe
-
-@rem Build src/Google.Protobuf.sln solution in Release configuration first.
-%NUGET% pack src\Google.Protobuf\Google.Protobuf.nuspec -Symbols || goto :error
+dotnet restore src
+dotnet pack -c Release src\Google.Protobuf || goto :error
 
 goto :EOF
 
diff --git a/csharp/buildall.sh b/csharp/buildall.sh
index 45af705..cab3222 100755
--- a/csharp/buildall.sh
+++ b/csharp/buildall.sh
@@ -1,17 +1,16 @@
 #!/bin/bash
-# Use mono to build solution and run all tests.
 
-# Adjust these to reflect the location of nunit-console in your system.
-NUNIT_CONSOLE=nunit-console
-
-# The rest you can leave intact
 CONFIG=Release
 SRC=$(dirname $0)/src
 
 set -ex
 
-echo Building the solution.
-xbuild /p:Configuration=$CONFIG $SRC/Google.Protobuf.sln
+echo Building relevant projects.
+dotnet build -c $CONFIG $SRC/Google.Protobuf $SRC/Google.Protobuf.Test $SRC/Google.Protobuf.Conformance
 
 echo Running tests.
-$NUNIT_CONSOLE $SRC/Google.Protobuf.Test/bin/$CONFIG/Google.Protobuf.Test.dll
+# Only test netcoreapp1.0, which uses the .NET Core runtime.
+# If we want to test the .NET 4.5 version separately, we could
+# run Mono explicitly. However, we don't have any differences between
+# the .NET 4.5 and netstandard1.0 assemblies.
+dotnet test -c $CONFIG -f netcoreapp1.0 $SRC/Google.Protobuf.Test
diff --git a/csharp/src/AddressBook/AddressBook.csproj b/csharp/src/AddressBook/AddressBook.csproj
deleted file mode 100644
index 8f8ca7e..0000000
--- a/csharp/src/AddressBook/AddressBook.csproj
+++ /dev/null
@@ -1,75 +0,0 @@
-﻿<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup>
-    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
-    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProductVersion>9.0.30729</ProductVersion>
-    <SchemaVersion>2.0</SchemaVersion>
-    <ProjectGuid>{A31F5FB2-4FF3-432A-B35B-5CD203606311}</ProjectGuid>
-    <OutputType>Exe</OutputType>
-    <AppDesignerFolder>Properties</AppDesignerFolder>
-    <RootNamespace>Google.Protobuf.Examples.AddressBook</RootNamespace>
-    <AssemblyName>AddressBook</AssemblyName>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
-    <FileAlignment>512</FileAlignment>
-    <StartupObject>Google.Protobuf.Examples.AddressBook.Program</StartupObject>
-    <TargetFrameworkProfile>
-    </TargetFrameworkProfile>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
-    <DebugSymbols>true</DebugSymbols>
-    <DebugType>full</DebugType>
-    <Optimize>false</Optimize>
-    <OutputPath>bin\Debug</OutputPath>
-    <IntermediateOutputPath>obj\Debug\</IntermediateOutputPath>
-    <DefineConstants>DEBUG;TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-    <NoStdLib>true</NoStdLib>
-    <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
-    <Prefer32Bit>false</Prefer32Bit>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <DebugType>pdbonly</DebugType>
-    <Optimize>true</Optimize>
-    <OutputPath>bin\Release</OutputPath>
-    <IntermediateOutputPath>obj\Release\</IntermediateOutputPath>
-    <DefineConstants>TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-    <NoStdLib>true</NoStdLib>
-    <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
-    <Prefer32Bit>false</Prefer32Bit>
-  </PropertyGroup>
-  <ItemGroup>
-    <Reference Include="mscorlib" />
-    <Reference Include="System" />
-    <Reference Include="System.Data" />
-    <Reference Include="System.Xml" />
-  </ItemGroup>
-  <ItemGroup>
-    <Compile Include="AddPerson.cs" />
-    <Compile Include="Addressbook.cs" />
-    <Compile Include="SampleUsage.cs" />
-    <Compile Include="ListPeople.cs" />
-    <Compile Include="Program.cs" />
-    <Compile Include="Properties\AssemblyInfo.cs" />
-  </ItemGroup>
-  <ItemGroup>
-    <ProjectReference Include="..\Google.Protobuf\Google.Protobuf.csproj">
-      <Project>{6908BDCE-D925-43F3-94AC-A531E6DF2591}</Project>
-      <Name>Google.Protobuf</Name>
-    </ProjectReference>
-  </ItemGroup>
-  <ItemGroup>
-    <None Include="app.config" />
-  </ItemGroup>
-  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
-       Other similar extension points exist, see Microsoft.Common.targets.
-  <Target Name="BeforeBuild">
-  </Target>
-  <Target Name="AfterBuild">
-  </Target>
-  -->
-</Project>
\ No newline at end of file
diff --git a/csharp/src/AddressBook/AddressBook.xproj b/csharp/src/AddressBook/AddressBook.xproj
new file mode 100644
index 0000000..4c9925e
--- /dev/null
+++ b/csharp/src/AddressBook/AddressBook.xproj
@@ -0,0 +1,19 @@
+﻿<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0</VisualStudioVersion>
+    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
+  </PropertyGroup>
+  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.Props" Condition="'$(VSToolsPath)' != ''" />
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>afb63919-1e05-43b4-802a-8fb8c9b2f463</ProjectGuid>
+    <RootNamespace>AddressBook</RootNamespace>
+    <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.\obj</BaseIntermediateOutputPath>
+    <OutputPath Condition="'$(OutputPath)'=='' ">.\bin\</OutputPath>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <SchemaVersion>2.0</SchemaVersion>
+  </PropertyGroup>
+  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.targets" Condition="'$(VSToolsPath)' != ''" />
+</Project>
\ No newline at end of file
diff --git a/csharp/src/AddressBook/Properties/AssemblyInfo.cs b/csharp/src/AddressBook/Properties/AssemblyInfo.cs
deleted file mode 100644
index 9cb014c..0000000
--- a/csharp/src/AddressBook/Properties/AssemblyInfo.cs
+++ /dev/null
@@ -1,18 +0,0 @@
-using System.Reflection;
-using System.Runtime.InteropServices;
-
-// General Information about an assembly is controlled through the following 
-// set of attributes. Change these attribute values to modify the information
-// associated with an assembly.
-
-[assembly: AssemblyTitle("AddressBook")]
-[assembly: AssemblyDescription("")]
-[assembly: AssemblyConfiguration("")]
-[assembly: AssemblyCompany("")]
-[assembly: AssemblyProduct("AddressBook")]
-[assembly: AssemblyCopyright("Copyright ©  2015")]
-[assembly: AssemblyTrademark("")]
-[assembly: AssemblyCulture("")]
-
-[assembly: AssemblyVersion("3.0.0.0")]
-[assembly: AssemblyFileVersion("3.0.0.0")]
diff --git a/csharp/src/AddressBook/SampleUsage.cs b/csharp/src/AddressBook/SampleUsage.cs
index aaaedda..941d865 100644
--- a/csharp/src/AddressBook/SampleUsage.cs
+++ b/csharp/src/AddressBook/SampleUsage.cs
@@ -66,7 +66,7 @@
             // The message performs a deep-comparison on equality:
             if (restored.People.Count != 1 || !person.Equals(restored.People[0]))
             {
-                throw new ApplicationException("There is a bad person in here!");
+                throw new Exception("There is a bad person in here!");
             }
         }
     }
diff --git a/csharp/src/AddressBook/app.config b/csharp/src/AddressBook/app.config
deleted file mode 100644
index a80813a..0000000
--- a/csharp/src/AddressBook/app.config
+++ /dev/null
@@ -1,3 +0,0 @@
-<?xml version="1.0"?>
-<configuration>
-	<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/></startup></configuration>
diff --git a/csharp/src/AddressBook/project.json b/csharp/src/AddressBook/project.json
new file mode 100644
index 0000000..c500bdc
--- /dev/null
+++ b/csharp/src/AddressBook/project.json
@@ -0,0 +1,20 @@
+{
+  "buildOptions": {
+    "debugType": "portable",
+    "emitEntryPoint": true,
+    "additionalArguments": [ "/main:Google.Protobuf.Examples.AddressBook.Program" ]
+  },
+  "dependencies": {
+    "Google.Protobuf": { "target": "project" }
+  },
+  "frameworks": {
+    "netcoreapp1.0": {
+      "dependencies": {
+        "Microsoft.NETCore.App": {
+          "type": "platform",
+          "version": "1.0.0"
+        }
+      }
+    }
+  }
+}
diff --git a/csharp/src/Google.Protobuf.Conformance/App.config b/csharp/src/Google.Protobuf.Conformance/App.config
deleted file mode 100644
index 8e15646..0000000
--- a/csharp/src/Google.Protobuf.Conformance/App.config
+++ /dev/null
@@ -1,6 +0,0 @@
-﻿<?xml version="1.0" encoding="utf-8" ?>
-<configuration>
-    <startup> 
-        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
-    </startup>
-</configuration>
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.csproj b/csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.csproj
deleted file mode 100644
index 82f728d..0000000
--- a/csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.csproj
+++ /dev/null
@@ -1,61 +0,0 @@
-﻿<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
-  <PropertyGroup>
-    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
-    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProjectGuid>{0607D1B8-80D6-4B35-9857-1263C1B32B94}</ProjectGuid>
-    <OutputType>Exe</OutputType>
-    <AppDesignerFolder>Properties</AppDesignerFolder>
-    <RootNamespace>Google.Protobuf.Conformance</RootNamespace>
-    <AssemblyName>Google.Protobuf.Conformance</AssemblyName>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
-    <FileAlignment>512</FileAlignment>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
-    <PlatformTarget>AnyCPU</PlatformTarget>
-    <DebugSymbols>true</DebugSymbols>
-    <DebugType>full</DebugType>
-    <Optimize>false</Optimize>
-    <OutputPath>bin\Debug\</OutputPath>
-    <DefineConstants>DEBUG;TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <PlatformTarget>AnyCPU</PlatformTarget>
-    <DebugType>pdbonly</DebugType>
-    <Optimize>true</Optimize>
-    <OutputPath>bin\Release\</OutputPath>
-    <DefineConstants>TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-  </PropertyGroup>
-  <ItemGroup>
-    <Reference Include="System" />
-    <Reference Include="System.Core" />
-    <Reference Include="Microsoft.CSharp" />
-  </ItemGroup>
-  <ItemGroup>
-    <Compile Include="Conformance.cs" />
-    <Compile Include="Program.cs" />
-    <Compile Include="Properties\AssemblyInfo.cs" />
-  </ItemGroup>
-  <ItemGroup>
-    <None Include="App.config" />
-  </ItemGroup>
-  <ItemGroup>
-    <ProjectReference Include="..\Google.Protobuf\Google.Protobuf.csproj">
-      <Project>{6908bdce-d925-43f3-94ac-a531e6df2591}</Project>
-      <Name>Google.Protobuf</Name>
-    </ProjectReference>
-  </ItemGroup>
-  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
-       Other similar extension points exist, see Microsoft.Common.targets.
-  <Target Name="BeforeBuild">
-  </Target>
-  <Target Name="AfterBuild">
-  </Target>
-  -->
-</Project>
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.xproj b/csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.xproj
new file mode 100644
index 0000000..99ff146
--- /dev/null
+++ b/csharp/src/Google.Protobuf.Conformance/Google.Protobuf.Conformance.xproj
@@ -0,0 +1,19 @@
+﻿<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0</VisualStudioVersion>
+    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
+  </PropertyGroup>
+  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.Props" Condition="'$(VSToolsPath)' != ''" />
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>dddc055b-e185-4181-bab0-072f0f984569</ProjectGuid>
+    <RootNamespace>Google.Protobuf.Conformance</RootNamespace>
+    <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.\obj</BaseIntermediateOutputPath>
+    <OutputPath Condition="'$(OutputPath)'=='' ">.\bin\</OutputPath>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <SchemaVersion>2.0</SchemaVersion>
+  </PropertyGroup>
+  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.targets" Condition="'$(VSToolsPath)' != ''" />
+</Project>
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf.Conformance/Properties/AssemblyInfo.cs b/csharp/src/Google.Protobuf.Conformance/Properties/AssemblyInfo.cs
deleted file mode 100644
index d22e90f..0000000
--- a/csharp/src/Google.Protobuf.Conformance/Properties/AssemblyInfo.cs
+++ /dev/null
@@ -1,48 +0,0 @@
-﻿#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2015 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System.Reflection;
-
-// General Information about an assembly is controlled through the following 
-// set of attributes. Change these attribute values to modify the information
-// associated with an assembly.
-[assembly: AssemblyTitle("Google.Protobuf.Conformance")]
-[assembly: AssemblyDescription("")]
-[assembly: AssemblyConfiguration("")]
-[assembly: AssemblyCompany("")]
-[assembly: AssemblyProduct("Google.Protobuf.Conformance")]
-[assembly: AssemblyCopyright("Copyright ©  2015")]
-[assembly: AssemblyTrademark("")]
-[assembly: AssemblyCulture("")]
-
-[assembly: AssemblyVersion("3.0.0.0")]
-[assembly: AssemblyFileVersion("3.0.0.0")]
diff --git a/csharp/src/Google.Protobuf.Conformance/project.json b/csharp/src/Google.Protobuf.Conformance/project.json
new file mode 100644
index 0000000..84b23c4
--- /dev/null
+++ b/csharp/src/Google.Protobuf.Conformance/project.json
@@ -0,0 +1,19 @@
+{
+  "buildOptions": {
+    "debugType": "portable",
+    "emitEntryPoint": true
+  },
+  "dependencies": {
+    "Google.Protobuf": { "target": "project" }
+  },
+  "frameworks": {
+    "netcoreapp1.0": {
+      "dependencies": {
+        "Microsoft.NETCore.App": {
+          "type": "platform",
+          "version": "1.0.0"
+        }
+      }
+    }
+  }
+}
diff --git a/csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.csproj b/csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.csproj
deleted file mode 100644
index ede1f77..0000000
--- a/csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.csproj
+++ /dev/null
@@ -1,68 +0,0 @@
-﻿<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup>
-    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
-    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProductVersion>9.0.30729</ProductVersion>
-    <SchemaVersion>2.0</SchemaVersion>
-    <ProjectGuid>{D7282E99-2DC3-405B-946F-177DB2FD2AE2}</ProjectGuid>
-    <OutputType>Exe</OutputType>
-    <AppDesignerFolder>Properties</AppDesignerFolder>
-    <RootNamespace>Google.Protobuf.JsonDump</RootNamespace>
-    <AssemblyName>Google.Protobuf.JsonDump</AssemblyName>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
-    <FileAlignment>512</FileAlignment>
-    <TargetFrameworkProfile>
-    </TargetFrameworkProfile>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
-    <DebugSymbols>true</DebugSymbols>
-    <DebugType>full</DebugType>
-    <Optimize>false</Optimize>
-    <OutputPath>bin\Debug</OutputPath>
-    <IntermediateOutputPath>obj\Debug\</IntermediateOutputPath>
-    <DefineConstants>DEBUG;TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-    <NoStdLib>true</NoStdLib>
-    <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
-    <Prefer32Bit>false</Prefer32Bit>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <DebugType>pdbonly</DebugType>
-    <Optimize>true</Optimize>
-    <OutputPath>bin\Release</OutputPath>
-    <IntermediateOutputPath>obj\Release\</IntermediateOutputPath>
-    <DefineConstants>TRACE</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-    <NoStdLib>true</NoStdLib>
-    <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
-    <Prefer32Bit>false</Prefer32Bit>
-  </PropertyGroup>
-  <ItemGroup>
-    <Reference Include="mscorlib" />
-    <Reference Include="System" />
-  </ItemGroup>
-  <ItemGroup>
-    <Compile Include="Program.cs" />
-    <Compile Include="Properties\AssemblyInfo.cs" />
-  </ItemGroup>
-  <ItemGroup>
-    <ProjectReference Include="..\Google.Protobuf\Google.Protobuf.csproj">
-      <Project>{6908BDCE-D925-43F3-94AC-A531E6DF2591}</Project>
-      <Name>Google.Protobuf</Name>
-    </ProjectReference>
-  </ItemGroup>
-  <ItemGroup>
-    <None Include="app.config" />
-  </ItemGroup>
-  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
-       Other similar extension points exist, see Microsoft.Common.targets.
-  <Target Name="BeforeBuild">
-  </Target>
-  <Target Name="AfterBuild">
-  </Target>
-  -->
-</Project>
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.xproj b/csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.xproj
new file mode 100644
index 0000000..27095be
--- /dev/null
+++ b/csharp/src/Google.Protobuf.JsonDump/Google.Protobuf.JsonDump.xproj
@@ -0,0 +1,19 @@
+﻿<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0</VisualStudioVersion>
+    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
+  </PropertyGroup>
+  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.Props" Condition="'$(VSToolsPath)' != ''" />
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>9695e08f-9829-497d-b95c-b38f28d48690</ProjectGuid>
+    <RootNamespace>Google.Protobuf.JsonDump</RootNamespace>
+    <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.\obj</BaseIntermediateOutputPath>
+    <OutputPath Condition="'$(OutputPath)'=='' ">.\bin\</OutputPath>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <SchemaVersion>2.0</SchemaVersion>
+  </PropertyGroup>
+  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.targets" Condition="'$(VSToolsPath)' != ''" />
+</Project>
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf.JsonDump/Program.cs b/csharp/src/Google.Protobuf.JsonDump/Program.cs
index 99e60e9..296b2f3 100644
--- a/csharp/src/Google.Protobuf.JsonDump/Program.cs
+++ b/csharp/src/Google.Protobuf.JsonDump/Program.cs
@@ -32,6 +32,7 @@
 
 using System;
 using System.IO;
+using System.Reflection;
 
 namespace Google.Protobuf.ProtoDump
 {
@@ -55,7 +56,7 @@
                 Console.Error.WriteLine("Unable to load type {0}.", args[0]);
                 return 1;
             }
-            if (!typeof(IMessage).IsAssignableFrom(type))
+            if (!typeof(IMessage).GetTypeInfo().IsAssignableFrom(type))
             {
                 Console.Error.WriteLine("Type {0} doesn't implement IMessage.", args[0]);
                 return 1;
diff --git a/csharp/src/Google.Protobuf.JsonDump/Properties/AssemblyInfo.cs b/csharp/src/Google.Protobuf.JsonDump/Properties/AssemblyInfo.cs
deleted file mode 100644
index d980b01..0000000
--- a/csharp/src/Google.Protobuf.JsonDump/Properties/AssemblyInfo.cs
+++ /dev/null
@@ -1,19 +0,0 @@
-using System.Reflection;
-using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
-
-// General Information about an assembly is controlled through the following 
-// set of attributes. Change these attribute values to modify the information
-// associated with an assembly.
-
-[assembly: AssemblyTitle("ProtoDump")]
-[assembly: AssemblyDescription("")]
-[assembly: AssemblyConfiguration("")]
-[assembly: AssemblyCompany("")]
-[assembly: AssemblyProduct("ProtoDump")]
-[assembly: AssemblyCopyright("Copyright ©  2015")]
-[assembly: AssemblyTrademark("")]
-[assembly: AssemblyCulture("")]
-
-[assembly: AssemblyVersion("3.0.0.0")]
-[assembly: AssemblyFileVersion("3.0.0.0")]
diff --git a/csharp/src/Google.Protobuf.JsonDump/app.config b/csharp/src/Google.Protobuf.JsonDump/app.config
deleted file mode 100644
index 51278a4..0000000
--- a/csharp/src/Google.Protobuf.JsonDump/app.config
+++ /dev/null
@@ -1,3 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<configuration>
-<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/></startup></configuration>
diff --git a/csharp/src/Google.Protobuf.JsonDump/project.json b/csharp/src/Google.Protobuf.JsonDump/project.json
new file mode 100644
index 0000000..84b23c4
--- /dev/null
+++ b/csharp/src/Google.Protobuf.JsonDump/project.json
@@ -0,0 +1,19 @@
+{
+  "buildOptions": {
+    "debugType": "portable",
+    "emitEntryPoint": true
+  },
+  "dependencies": {
+    "Google.Protobuf": { "target": "project" }
+  },
+  "frameworks": {
+    "netcoreapp1.0": {
+      "dependencies": {
+        "Microsoft.NETCore.App": {
+          "type": "platform",
+          "version": "1.0.0"
+        }
+      }
+    }
+  }
+}
diff --git a/csharp/src/Google.Protobuf.Test/FieldCodecTest.cs b/csharp/src/Google.Protobuf.Test/FieldCodecTest.cs
index c616470..0e2bad5 100644
--- a/csharp/src/Google.Protobuf.Test/FieldCodecTest.cs
+++ b/csharp/src/Google.Protobuf.Test/FieldCodecTest.cs
@@ -32,6 +32,7 @@
 
 using System.Collections.Generic;
 using System.IO;
+using System.Reflection;
 using Google.Protobuf.TestProtos;
 using NUnit.Framework;
 
@@ -162,7 +163,7 @@
                 codedOutput.Flush();
                 Assert.AreEqual(0, stream.Position);
                 Assert.AreEqual(0, codec.CalculateSizeWithTag(codec.DefaultValue));
-                if (typeof(T).IsValueType)
+                if (typeof(T).GetTypeInfo().IsValueType)
                 {
                     Assert.AreEqual(default(T), codec.DefaultValue);
                 }
diff --git a/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj b/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj
deleted file mode 100644
index 4f37c5e..0000000
--- a/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.csproj
+++ /dev/null
@@ -1,143 +0,0 @@
-﻿<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup>
-    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
-    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
-    <ProductVersion>9.0.30729</ProductVersion>
-    <SchemaVersion>2.0</SchemaVersion>
-    <ProjectGuid>{DD01ED24-3750-4567-9A23-1DB676A15610}</ProjectGuid>
-    <OutputType>Library</OutputType>
-    <AppDesignerFolder>Properties</AppDesignerFolder>
-    <RootNamespace>Google.Protobuf</RootNamespace>
-    <AssemblyName>Google.Protobuf.Test</AssemblyName>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
-    <FileAlignment>512</FileAlignment>
-    <OldToolsVersion>3.5</OldToolsVersion>
-    <TargetFrameworkProfile>
-    </TargetFrameworkProfile>
-    <NuGetPackageImportStamp>
-    </NuGetPackageImportStamp>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
-    <DebugSymbols>true</DebugSymbols>
-    <DebugType>full</DebugType>
-    <Optimize>false</Optimize>
-    <OutputPath>bin\Debug</OutputPath>
-    <IntermediateOutputPath>obj\Debug\</IntermediateOutputPath>
-    <DefineConstants>DEBUG;TRACE;$(EnvironmentFlavor);$(EnvironmentTemplate)</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-    <NoStdLib>true</NoStdLib>
-    <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
-    <Prefer32Bit>false</Prefer32Bit>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <DebugType>pdbonly</DebugType>
-    <Optimize>true</Optimize>
-    <OutputPath>bin\Release</OutputPath>
-    <IntermediateOutputPath>obj\Release\</IntermediateOutputPath>
-    <DefineConstants>TRACE;$(EnvironmentFlavor);$(EnvironmentTemplate)</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-    <NoStdLib>true</NoStdLib>
-    <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
-    <Prefer32Bit>false</Prefer32Bit>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'ReleaseSigned|AnyCPU' ">
-    <DebugType>pdbonly</DebugType>
-    <Optimize>true</Optimize>
-    <OutputPath>bin\ReleaseSigned</OutputPath>
-    <IntermediateOutputPath>obj\ReleaseSigned\</IntermediateOutputPath>
-    <DefineConstants>TRACE;$(EnvironmentFlavor);$(EnvironmentTemplate)</DefineConstants>
-    <ErrorReport>prompt</ErrorReport>
-    <WarningLevel>4</WarningLevel>
-    <NoStdLib>true</NoStdLib>
-    <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
-    <Prefer32Bit>false</Prefer32Bit>
-    <SignAssembly>True</SignAssembly>
-    <AssemblyOriginatorKeyFile>..\..\keys\Google.Protobuf.snk</AssemblyOriginatorKeyFile>
-  </PropertyGroup>
-  <ItemGroup>
-    <Reference Include="mscorlib" />
-    <Reference Include="nunit.core, Version=2.6.4.14350, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77, processorArchitecture=MSIL">
-      <HintPath>..\packages\NUnitTestAdapter.2.0.0\lib\nunit.core.dll</HintPath>
-      <Private>True</Private>
-    </Reference>
-    <Reference Include="nunit.core.interfaces, Version=2.6.4.14350, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77, processorArchitecture=MSIL">
-      <HintPath>..\packages\NUnitTestAdapter.2.0.0\lib\nunit.core.interfaces.dll</HintPath>
-      <Private>True</Private>
-    </Reference>
-    <Reference Include="nunit.framework, Version=2.6.4.14350, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77, processorArchitecture=MSIL">
-      <HintPath>..\packages\NUnit.2.6.4\lib\nunit.framework.dll</HintPath>
-      <Private>True</Private>
-    </Reference>
-    <Reference Include="nunit.util, Version=2.6.4.14350, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77, processorArchitecture=MSIL">
-      <HintPath>..\packages\NUnitTestAdapter.2.0.0\lib\nunit.util.dll</HintPath>
-      <Private>True</Private>
-    </Reference>
-    <Reference Include="NUnit.VisualStudio.TestAdapter, Version=2.0.0.0, Culture=neutral, PublicKeyToken=4cb40d35494691ac, processorArchitecture=MSIL">
-      <HintPath>..\packages\NUnitTestAdapter.2.0.0\lib\NUnit.VisualStudio.TestAdapter.dll</HintPath>
-      <Private>True</Private>
-    </Reference>
-    <Reference Include="System" />
-    <Reference Include="System.Xml" />
-  </ItemGroup>
-  <ItemGroup>
-    <Compile Include="ByteStringTest.cs" />
-    <Compile Include="CodedInputStreamExtensions.cs" />
-    <Compile Include="CodedInputStreamTest.cs" />
-    <Compile Include="CodedOutputStreamTest.cs" />
-    <Compile Include="Compatibility\PropertyInfoExtensionsTest.cs" />
-    <Compile Include="Compatibility\TypeExtensionsTest.cs" />
-    <Compile Include="EqualityTester.cs" />
-    <Compile Include="FieldCodecTest.cs" />
-    <Compile Include="GeneratedMessageTest.cs" />
-    <Compile Include="Collections\MapFieldTest.cs" />
-    <Compile Include="Collections\RepeatedFieldTest.cs" />
-    <Compile Include="JsonFormatterTest.cs" />
-    <Compile Include="JsonParserTest.cs" />
-    <Compile Include="JsonTokenizerTest.cs" />
-    <Compile Include="Reflection\DescriptorsTest.cs" />
-    <Compile Include="Reflection\FieldAccessTest.cs" />
-    <Compile Include="Reflection\TypeRegistryTest.cs" />
-    <Compile Include="SampleEnum.cs" />
-    <Compile Include="SampleMessages.cs" />
-    <Compile Include="TestProtos\ForeignMessagePartial.cs" />
-    <Compile Include="TestProtos\MapUnittestProto3.cs" />
-    <Compile Include="TestProtos\UnittestImportProto3.cs" />
-    <Compile Include="TestProtos\UnittestImportPublicProto3.cs" />
-    <Compile Include="TestProtos\UnittestIssues.cs" />
-    <Compile Include="TestProtos\UnittestProto3.cs" />
-    <Compile Include="DeprecatedMemberTest.cs" />
-    <Compile Include="IssuesTest.cs" />
-    <Compile Include="Properties\AssemblyInfo.cs" />
-    <Compile Include="TestCornerCases.cs" />
-    <Compile Include="TestProtos\UnittestWellKnownTypes.cs" />
-    <Compile Include="WellKnownTypes\AnyTest.cs" />
-    <Compile Include="WellKnownTypes\DurationTest.cs" />
-    <Compile Include="WellKnownTypes\FieldMaskTest.cs" />
-    <Compile Include="WellKnownTypes\TimestampTest.cs" />
-    <Compile Include="WellKnownTypes\WrappersTest.cs" />
-  </ItemGroup>
-  <ItemGroup>
-    <ProjectReference Include="..\Google.Protobuf\Google.Protobuf.csproj">
-      <Project>{6908BDCE-D925-43F3-94AC-A531E6DF2591}</Project>
-      <Name>Google.Protobuf</Name>
-    </ProjectReference>
-  </ItemGroup>
-  <ItemGroup>
-    <None Include="packages.config" />
-  </ItemGroup>
-  <ItemGroup>
-    <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
-  </ItemGroup>
-  <ItemGroup />
-  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
-       Other similar extension points exist, see Microsoft.Common.targets.
-  <Target Name="BeforeBuild">
-  </Target>
-  <Target Name="AfterBuild">
-  </Target>
-  -->
-</Project>
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.xproj b/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.xproj
new file mode 100644
index 0000000..a9a1cc0
--- /dev/null
+++ b/csharp/src/Google.Protobuf.Test/Google.Protobuf.Test.xproj
@@ -0,0 +1,19 @@
+﻿<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0</VisualStudioVersion>
+    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
+  </PropertyGroup>
+  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.Props" Condition="'$(VSToolsPath)' != ''" />
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>580eb013-d3c7-4578-b845-015f4a3b0591</ProjectGuid>
+    <RootNamespace>Google.Protobuf.Test</RootNamespace>
+    <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.\obj</BaseIntermediateOutputPath>
+    <OutputPath Condition="'$(OutputPath)'=='' ">.\bin\</OutputPath>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <SchemaVersion>2.0</SchemaVersion>
+  </PropertyGroup>
+  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.targets" Condition="'$(VSToolsPath)' != ''" />
+</Project>
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf.Test/Properties/AppManifest.xml b/csharp/src/Google.Protobuf.Test/Properties/AppManifest.xml
deleted file mode 100644
index a955232..0000000
--- a/csharp/src/Google.Protobuf.Test/Properties/AppManifest.xml
+++ /dev/null
@@ -1,6 +0,0 @@
-﻿<Deployment xmlns="http://schemas.microsoft.com/client/2007/deployment"
-        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
->
-    <Deployment.Parts>
-    </Deployment.Parts>
-</Deployment>
diff --git a/csharp/src/Google.Protobuf.Test/Properties/AssemblyInfo.cs b/csharp/src/Google.Protobuf.Test/Properties/AssemblyInfo.cs
deleted file mode 100644
index d00acf8..0000000
--- a/csharp/src/Google.Protobuf.Test/Properties/AssemblyInfo.cs
+++ /dev/null
@@ -1,20 +0,0 @@
-using System;
-using System.Reflection;
-using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
-
-// General Information about an assembly is controlled through the following 
-// set of attributes. Change these attribute values to modify the information
-// associated with an assembly.
-
-[assembly: AssemblyTitle("Google.Protobuf.Test")]
-[assembly: AssemblyDescription("")]
-[assembly: AssemblyConfiguration("")]
-[assembly: AssemblyCompany("")]
-[assembly: AssemblyProduct("Google.Protobuf.Test")]
-[assembly: AssemblyCopyright("Copyright ©  2015")]
-[assembly: AssemblyTrademark("")]
-[assembly: AssemblyCulture("")]
-
-[assembly: AssemblyVersion("3.0.0.0")]
-[assembly: AssemblyFileVersion("3.0.0.0")]
diff --git a/csharp/src/Google.Protobuf.Test/WellKnownTypes/AnyTest.cs b/csharp/src/Google.Protobuf.Test/WellKnownTypes/AnyTest.cs
index f21be7d..4aecc99 100644
--- a/csharp/src/Google.Protobuf.Test/WellKnownTypes/AnyTest.cs
+++ b/csharp/src/Google.Protobuf.Test/WellKnownTypes/AnyTest.cs
@@ -96,7 +96,7 @@
             var message = SampleMessages.CreateFullTestAllTypes();
             var any = Any.Pack(message);
             var text = any.ToString();
-            Assert.That(text, Is.StringContaining("\"@value\": \"" + message.ToByteString().ToBase64() + "\""));
+            Assert.That(text, Does.Contain("\"@value\": \"" + message.ToByteString().ToBase64() + "\""));
         }
 
         [Test]
diff --git a/csharp/src/Google.Protobuf.Test/WellKnownTypes/FieldMaskTest.cs b/csharp/src/Google.Protobuf.Test/WellKnownTypes/FieldMaskTest.cs
index 89bc827..1d9908b 100644
--- a/csharp/src/Google.Protobuf.Test/WellKnownTypes/FieldMaskTest.cs
+++ b/csharp/src/Google.Protobuf.Test/WellKnownTypes/FieldMaskTest.cs
@@ -46,8 +46,8 @@
             var mask = new FieldMask { Paths = { input } };
             var text = mask.ToString();
             // More specific test below
-            Assert.That(text, Is.StringContaining("@warning"));
-            Assert.That(text, Is.StringContaining(input));
+            Assert.That(text, Does.Contain("@warning"));
+            Assert.That(text, Does.Contain(input));
         }
 
         [Test]
diff --git a/csharp/src/Google.Protobuf.Test/packages.config b/csharp/src/Google.Protobuf.Test/packages.config
deleted file mode 100644
index c765399..0000000
--- a/csharp/src/Google.Protobuf.Test/packages.config
+++ /dev/null
@@ -1,5 +0,0 @@
-﻿<?xml version="1.0" encoding="utf-8"?>
-<packages>
-  <package id="NUnit" version="2.6.4" targetFramework="net45" userInstalled="true" />
-  <package id="NUnitTestAdapter" version="2.0.0" targetFramework="net45" userInstalled="true" />
-</packages>
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf.Test/project.json b/csharp/src/Google.Protobuf.Test/project.json
new file mode 100644
index 0000000..87b732c
--- /dev/null
+++ b/csharp/src/Google.Protobuf.Test/project.json
@@ -0,0 +1,44 @@
+{
+  "buildOptions": {
+    "debugType": "portable",
+    "keyFile": "../../keys/Google.Protobuf.snk"
+  },
+
+  "configurations": {
+    "Debug": {
+      "buildOptions": {
+        "define": [ "DEBUG", "TRACE" ]
+      }
+    },
+    "Release": {
+      "buildOptions": {
+        "define": [ "RELEASE", "TRACE" ],
+        "optimize": true
+      }
+    }
+  },
+
+  "dependencies": {
+    "Google.Protobuf": { "target": "project" },
+    "NUnit": "3.4.0",
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deleted file mode 100644
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new file mode 100644
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+    <SchemaVersion>2.0</SchemaVersion>
+  </PropertyGroup>
+  <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.targets" Condition="'$(VSToolsPath)' != ''" />
+</Project>
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf/Properties/AssemblyInfo.cs b/csharp/src/Google.Protobuf/Properties/AssemblyInfo.cs
index 0516f18..9b179bd 100644
--- a/csharp/src/Google.Protobuf/Properties/AssemblyInfo.cs
+++ b/csharp/src/Google.Protobuf/Properties/AssemblyInfo.cs
@@ -30,7 +30,6 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #endregion
 
-using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Security;
 
@@ -38,30 +37,13 @@
 // set of attributes. Change these attribute values to modify the information
 // associated with an assembly.
 
-[assembly: AssemblyTitle("Google.Protobuf")]
-[assembly: AssemblyDescription("")]
-[assembly: AssemblyConfiguration("")]
-[assembly: AssemblyCompany("")]
-[assembly: AssemblyProduct("Google.Protobuf")]
-[assembly: AssemblyCopyright("Copyright ©  2015")]
-[assembly: AssemblyTrademark("")]
-[assembly: AssemblyCulture("")]
-
 #if !NCRUNCH
 [assembly: AllowPartiallyTrustedCallers]
 #endif
 
-#if SIGNED
 [assembly: InternalsVisibleTo("Google.Protobuf.Test, PublicKey=" +
     "002400000480000094000000060200000024000052534131000400000100010025800fbcfc63a1" +
     "7c66b303aae80b03a6beaa176bb6bef883be436f2a1579edd80ce23edf151a1f4ced97af83abcd" +
     "981207041fd5b2da3b498346fcfcd94910d52f25537c4a43ce3fbe17dc7d43e6cbdb4d8f1242dc" +
     "b6bd9b5906be74da8daa7d7280f97130f318a16c07baf118839b156299a48522f9fae2371c9665" +
     "c5ae9cb6")]
-#else
-[assembly: InternalsVisibleTo("Google.Protobuf.Test")]
-#endif
-
-[assembly: AssemblyVersion("3.0.0.0")]
-[assembly: AssemblyFileVersion("3.0.0.0")]
-[assembly: AssemblyInformationalVersion("3.0.0-beta3")]
diff --git a/csharp/src/Google.Protobuf/packages.config b/csharp/src/Google.Protobuf/packages.config
deleted file mode 100644
index 40b8fd9..0000000
--- a/csharp/src/Google.Protobuf/packages.config
+++ /dev/null
@@ -1,4 +0,0 @@
-﻿<?xml version="1.0" encoding="utf-8"?>
-<packages>
-  <package id="NuSpec.ReferenceGenerator" version="1.4.1" targetFramework="portable45-net45+win8+wp8+wpa81" developmentDependency="true" />
-</packages>
\ No newline at end of file
diff --git a/csharp/src/Google.Protobuf/project.json b/csharp/src/Google.Protobuf/project.json
new file mode 100644
index 0000000..c8eae6d
--- /dev/null
+++ b/csharp/src/Google.Protobuf/project.json
@@ -0,0 +1,65 @@
+{
+  "version": "3.0.0-beta4",
+  "title": "Google Protocol Buffers",
+  "description": "See project site for more info.",
+  "authors": [ "Google Inc." ],
+  "copyright": "Copyright 2015, Google Inc.",
+
+  "packOptions": {
+    "summary": "C# runtime library for Protocol Buffers - Google's data interchange format.",
+    "tags": [ "Protocol", "Buffers", "Binary", "Serialization", "Format", "Google", "proto", "proto3" ],
+    "owners": [ "protobuf-packages" ],
+    "licenseUrl": "https://github.com/google/protobuf/blob/master/LICENSE",
+    "projectUrl": "https://github.com/google/protobuf",
+    "releaseNotes": "C# proto3 support",
+    "requireLicenseAcceptance": false,
+    "repository": {
+      "url": "https://github.com/nodatime/nodatime.git"
+    }
+  },
+
+  "buildOptions": {
+    "debugType": "portable",
+    "keyFile": "../../keys/Google.Protobuf.snk",
+    "xmlDoc": true
+  },
+
+  "configurations": {
+    "Debug": {
+      "buildOptions": {
+        "define": [ "DEBUG", "TRACE" ]
+      }
+    },
+    "Release": {
+      "buildOptions": {
+        "define": [ "RELEASE", "TRACE" ],
+        "optimize": true
+      }
+    }
+  },
+
+  "frameworks": {
+    // This target allows the package to be installed in a .NET 4.5+
+    // project without asking for myriad other dependencies.
+    "net45": {
+    },
+    "netstandard1.0": {
+      "dependencies": {
+        "System.Collections": "4.0.11",
+        "System.Diagnostics.Debug": "4.0.11",
+        "System.Globalization": "4.0.11",
+        "System.IO": "4.1.0",
+        "System.Linq": "4.1.0",
+        "System.Linq.Expressions": "4.1.0",
+        "System.ObjectModel": "4.0.12",
+        "System.Reflection": "4.1.0",
+        "System.Reflection.Extensions": "4.0.1",
+        "System.Runtime": "4.1.0",
+        "System.Runtime.Extensions": "4.1.0",
+        "System.Text.Encoding": "4.0.11",
+        "System.Text.RegularExpressions": "4.1.0",
+        "System.Threading": "4.0.11"
+      }
+    }
+  }
+}
diff --git a/jenkins/docker/Dockerfile b/jenkins/docker/Dockerfile
index 8467aef..c928ac7 100644
--- a/jenkins/docker/Dockerfile
+++ b/jenkins/docker/Dockerfile
@@ -23,6 +23,13 @@
   echo "deb http://download.mono-project.com/repo/debian wheezy-libjpeg62-compat main" | tee -a /etc/apt/sources.list.d/mono-xamarin.list && \
   apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
 
+# Install dotnet SDK based on https://www.microsoft.com/net/core#debian
+# (Ubuntu instructions need apt to support https)
+RUN apt-get update && apt-get install -y curl libunwind8 gettext && \
+  curl -sSL -o dotnet.tar.gz https://go.microsoft.com/fwlink/?LinkID=809130 && \
+  mkdir -p /opt/dotnet && tar zxf dotnet.tar.gz -C /opt/dotnet && \
+  ln -s /opt/dotnet/dotnet /usr/local/bin
+
 # Install dependencies.  We start with the basic ones require to build protoc
 # and the C++ build
 RUN apt-get update && apt-get install -y \
diff --git a/tests.sh b/tests.sh
index 72465a7..99e5df4 100755
--- a/tests.sh
+++ b/tests.sh
@@ -57,15 +57,27 @@
   if [ "$TRAVIS" == "true" ]; then
     # Install latest version of Mono
     sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
+    sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1397BC53640DB551
     echo "deb http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list
-    echo "deb http://download.mono-project.com/repo/debian wheezy-libtiff-compat main" | sudo tee -a /etc/apt/sources.list.d/mono-xamarin.list
     sudo apt-get update -qq
     sudo apt-get install -qq mono-devel referenceassemblies-pcl nunit
-    wget www.nuget.org/NuGet.exe -O nuget.exe
-    NUGET=../../nuget.exe
+    
+    # Then install the dotnet SDK as per Ubuntu 14.04 instructions on dot.net.
+    sudo sh -c 'echo "deb [arch=amd64] https://apt-mo.trafficmanager.net/repos/dotnet/ trusty main" > /etc/apt/sources.list.d/dotnetdev.list'
+    sudo apt-key adv --keyserver apt-mo.trafficmanager.net --recv-keys 417A0893
+    sudo apt-get update -qq
+    sudo apt-get install -qq dotnet-dev-1.0.0-preview2-003121
   fi
 
-  (cd csharp/src; mono $NUGET restore)
+  # Perform "dotnet new" once to get the setup preprocessing out of the
+  # way. That spews a lot of output (including backspaces) into logs
+  # otherwise, and can cause problems. It doesn't matter if this step
+  # is performed multiple times; it's cheap after the first time anyway.
+  mkdir dotnettmp
+  (cd dotnettmp; dotnet new > /dev/null)
+  rm -rf dotnettmp
+
+  (cd csharp/src; dotnet restore)
   csharp/buildall.sh
   cd conformance && make test_csharp && cd ..
 }