Handle DependencyPropertyChangedEventArgs (RCS1163) (dotnet#1068)

ChangeLog.md

@@ -31,7 +31,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - [CLI] Analyze command does not create the XML output file and returns incorrect exit code when only compiler diagnostics are reported ([#1056](https://github.com/JosefPihrt/Roslynator/pull/1056) by @PeterKaszab).
 - [CLI] Fix exit code when multiple projects are processed ([#1061](https://github.com/JosefPihrt/Roslynator/pull/1061) by @PeterKaszab).
 - Fix code fix for CS0164 ([#1031](https://github.com/JosefPihrt/Roslynator/pull/1031)).
-
+- Do not report `System.Windows.DependencyPropertyChangedEventArgs` as unused parameter ([RCS1163](https://github.com/JosefPihrt/Roslynator/blob/main/docs/analyzers/RCS1163.md)) ([#1068](https://github.com/JosefPihrt/Roslynator/pull/1068)).
 
 ## [4.2.0] - 2022-11-27
 

src/Core/MetadataNames.cs

@@ -66,6 +66,7 @@ internal static class MetadataNames
     public static readonly MetadataName System_Threading_Tasks_ValueTask_T = MetadataName.Parse("System.Threading.Tasks.ValueTask`1");
     public static readonly MetadataName System_TimeSpan = MetadataName.Parse("System.TimeSpan");
     public static readonly MetadataName System_ValueType = MetadataName.Parse("System.ValueType");
+    public static readonly MetadataName System_Windows_DependencyPropertyChangedEventArgs = MetadataName.Parse("System.Windows.DependencyPropertyChangedEventArgs");
 
     public static class WinRT
     {

src/Core/SymbolUtility.cs

@@ -82,7 +82,8 @@ public static bool IsEventHandlerMethod(IMethodSymbol methodSymbol)
                 if (type.Kind == SymbolKind.TypeParameter)
                     return type.Name.EndsWith("EventArgs", StringComparison.Ordinal);
 
-                return type.EqualsOrInheritsFrom(MetadataNames.System_EventArgs);
+                return type.EqualsOrInheritsFrom(MetadataNames.System_EventArgs)
+                    || type.HasMetadataName(MetadataNames.System_Windows_DependencyPropertyChangedEventArgs);
             }
         }
 

src/Tests/Analyzers.Tests/RCS1163UnusedParameterTests.cs

@@ -204,4 +204,37 @@ public static int GetCount(__arglist)
 }
 ");
     }
+
+    [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.UnusedParameter)]
+    public async Task TestNoDiagnostic_DependencyPropertyEventArgs()
+    {
+        await VerifyNoDiagnosticAsync(@"
+using System;
+using System.Windows;
+
+static class C
+{
+    public static void M(this Foo foo)
+    {
+        foo.Changed += Foo_Changed;
+
+        void Foo_Changed(object sender, DependencyPropertyChangedEventArgs e)
+        {
+        }
+    }
+}
+
+public class Foo
+{
+    public event EventHandler<DependencyPropertyChangedEventArgs> Changed;
+}
+
+namespace System.Windows
+{
+    public class DependencyPropertyChangedEventArgs
+    {
+    }
+}
+ ");
+    }
 }