csharp/src/Google.Protobuf/Compatibility/RequiresUnreferencedCodeAttribute.cs

#region Copyright notice and license
// Protocol Buffers - Google's data interchange format
// Copyright 2015 Google Inc.  All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
#endregion

#if !NET5_0_OR_GREATER
// Copied with permission from https://github.com/dotnet/runtime/tree/8fbf206d0e518b45ca855832e8bfb391afa85972/src/libraries/System.Private.CoreLib/src/System/Diagnostics/CodeAnalysis
namespace System.Diagnostics.CodeAnalysis
{
    /// <summary>
    /// Indicates that the specified method requires dynamic access to code that is not referenced
    /// statically, for example through <see cref="System.Reflection"/>.
    /// </summary>
    /// <remarks>
    /// This allows tools to understand which methods are unsafe to call when removing unreferenced
    /// code from an application.
    /// </remarks>
    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Constructor | AttributeTargets.Class, Inherited = false)]
    internal sealed class RequiresUnreferencedCodeAttribute : Attribute
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="RequiresUnreferencedCodeAttribute"/> class
        /// with the specified message.
        /// </summary>
        /// <param name="message">
        /// A message that contains information about the usage of unreferenced code.
        /// </param>
        public RequiresUnreferencedCodeAttribute(string message)
        {
            Message = message;
        }

        /// <summary>
        /// Gets a message that contains information about the usage of unreferenced code.
        /// </summary>
        public string Message { get; }

        /// <summary>
        /// Gets or sets an optional URL that contains more information about the method,
        /// why it requires unreferenced code, and what options a consumer has to deal with it.
        /// </summary>
        public string Url { get; set; }
    }
}
#endif