Add NoCodeFixAttribute

Author: sharwell

AsyncUsageAnalyzers/AsyncUsageAnalyzers/AsyncUsageAnalyzers.csproj

@@ -45,6 +45,7 @@
     <Compile Include="AnalyzerConstants.cs" />
     <Compile Include="AnalyzerExtensions.cs" />
     <Compile Include="GeneratedCodeAnalysisExtensions.cs" />
+    <Compile Include="NoCodeFixAttribute.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Resources.Designer.cs">
       <AutoGen>True</AutoGen>

AsyncUsageAnalyzers/AsyncUsageAnalyzers/NoCodeFixAttribute.cs

@@ -0,0 +1,40 @@
+namespace AsyncUsageAnalyzers
+{
+    using System;
+    using Microsoft.CodeAnalysis.Diagnostics;
+
+    /// <summary>
+    /// This attribute is applied to <see cref="DiagnosticAnalyzer"/>'s if will not get a code fix.
+    /// Reasons for this would be:
+    /// <list type="bullet">
+    /// <item>Visual Studio provides a built-in code fix.</item>
+    /// <item>A code fix could not provide a useful solution.</item>
+    /// </list>
+    /// The reason should be provided.
+    /// </summary>
+    [AttributeUsage(System.AttributeTargets.Class, Inherited = false, AllowMultiple = false)]
+    public sealed class NoCodeFixAttribute : System.Attribute
+    {
+        private readonly string reason;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="NoCodeFixAttribute"/> class.
+        /// </summary>
+        /// <param name="reason">The reason why the <see cref="DiagnosticAnalyzer"/> does not have a code fix.</param>
+        public NoCodeFixAttribute(string reason)
+        {
+            this.reason = reason;
+        }
+
+        /// <summary>
+        /// Gets the reason why the <see cref="DiagnosticAnalyzer"/> does not have a code fix.
+        /// </summary>
+        /// <value>
+        /// The reason why the <see cref="DiagnosticAnalyzer"/> does not have a code fix.
+        /// </value>
+        public string Reason
+        {
+            get { return this.reason; }
+        }
+    }
+}