introduce local variable for parameter list node

src/Features/Core/Portable/ReplaceMethodWithProperty/AbstractReplaceMethodWithPropertyService.cs

@@ -48,14 +48,15 @@ private static bool OverridesMetadataSymbol(IMethodSymbol method)
             var getMethodDeclaration = getAndSetMethods.GetMethodDeclaration;
             var setMethodDeclaration = getAndSetMethods.SetMethodDeclaration;
             var finalLeadingTrivia = getAndSetMethods.GetMethodDeclaration.GetLeadingTrivia().ToList();
+            var paramList = syntaxFacts.GetParameterList(getMethodDeclaration);
 
             //If there is a comment on the same line as the method it is contained in trailing trivia for the parameter list
             //If it's there we need to add it to the final comments
             //this is to fix issue 42699, https://github.com/dotnet/roslyn/issues/42699
-            if (getMethodDeclaration.ChildNodes().Any(n => n.RawKind == syntaxFacts.SyntaxKinds.ParameterList && n.GetTrailingTrivia().Any(t => !syntaxFacts.IsWhitespaceOrEndOfLineTrivia(t))))
+            if (paramList.GetTrailingTrivia().Any(t => !syntaxFacts.IsWhitespaceOrEndOfLineTrivia(t)))
             {
                 //we have a meaningful comment on the parameter list so add it to the trivia list
-                finalLeadingTrivia.AddRange(getMethodDeclaration.ChildNodes().Where(n => n.RawKind == syntaxFacts.SyntaxKinds.ParameterList).First().GetTrailingTrivia());
+                finalLeadingTrivia.AddRange(paramList.GetTrailingTrivia());
             }
 
             if (setMethodDeclaration == null)
@@ -70,10 +71,11 @@ private static bool OverridesMetadataSymbol(IMethodSymbol method)
 
             //If there is a comment on the same line as the method it is contained in trailing trivia for the parameter list
             //If it's there we need to add it to the final comments
-            if (setMethodDeclaration.ChildNodes().Any(n => n.RawKind == syntaxFacts.SyntaxKinds.ParameterList && n.GetTrailingTrivia().Any(t => !syntaxFacts.IsWhitespaceOrEndOfLineTrivia(t))))
+            paramList = syntaxFacts.GetParameterList(setMethodDeclaration);
+            if (paramList.GetTrailingTrivia().Any(t => !syntaxFacts.IsWhitespaceOrEndOfLineTrivia(t)))
             {
                 //we have a meaningful comment on the parameter list so add it to the trivia list
-                finalLeadingTrivia.AddRange(setMethodDeclaration.ChildNodes().Where(n => n.RawKind == syntaxFacts.SyntaxKinds.ParameterList).First().GetTrailingTrivia());
+                finalLeadingTrivia.AddRange(paramList.GetTrailingTrivia());
             }
 
             return property.WithLeadingTrivia(finalLeadingTrivia);