ValidateValueCallback

Author: JohanLarsson

WpfAnalyzers/Analyzers/RegistrationAnalyzer.cs

@@ -36,7 +36,7 @@ context.Node is InvocationExpressionSyntax invocation &&
             register.PropertyName(context.SemanticModel, context.CancellationToken) is { } registeredName)
         {
             if (register.FindArgument(KnownSymbols.ValidateValueCallback) is { } validateValueCallback &&
-                Callback.Match(validateValueCallback, KnownSymbols.ValidateValueCallback, context.SemanticModel, context.CancellationToken) is { Identifier: { } identifier, Target: { } target })
+                ValidateValueCallback.Match(validateValueCallback, context.SemanticModel, context.CancellationToken) is { Identifier: { } identifier, Target: { } target })
             {
                 if (TypeSymbolComparer.Equal(target.ContainingType, context.ContainingSymbol.ContainingType) &&
                     !MatchesValidateValueCallbackName(validateValueCallback, target, context))

WpfAnalyzers/Helpers/ValidateValueCallback.cs

@@ -0,0 +1,27 @@
+namespace WpfAnalyzers;
+
+using System.Threading;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+
+internal readonly struct ValidateValueCallback
+{
+    internal readonly IdentifierNameSyntax Identifier;
+    internal readonly IMethodSymbol Target;
+
+    internal ValidateValueCallback(IdentifierNameSyntax identifier, IMethodSymbol target)
+    {
+        this.Identifier = identifier;
+        this.Target = target;
+    }
+
+    internal static ValidateValueCallback? Match(ArgumentSyntax callback, SemanticModel semanticModel, CancellationToken cancellationToken)
+    {
+        if (Callback.Match(callback, KnownSymbols.ValidateValueCallback, semanticModel, cancellationToken) is { } match)
+        {
+            return new ValidateValueCallback(match.Identifier, match.Target);
+        }
+
+        return null;
+    }
+}