// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
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="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)]
#if SYSTEM_PRIVATE_CORELIB
    public
#else
    internal
#endif
        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; }
    }
}