Fix invalid cast converting Markdown code blocks

Fixes #42

Author: sharwell

DocumentationAnalyzers/DocumentationAnalyzers.Test/RefactoringRules/DOC900UnitTests.cs

@@ -225,6 +225,30 @@ void Method<T2>() { }
             await VerifyCodeFixAsync(testCode, fixedCode);
         }
 
+        [Fact]
+        [WorkItem(42, "https://github.com/DotNetAnalyzers/DocumentationAnalyzers/issues/42")]
+        public async Task TestPropertyDocumentationWithCodeBlockAsync()
+        {
+            var testCode = @"
+class TestClass {
+    ///$$ <summary>
+    /// Provide a `value`.
+    /// </summary>
+    int Method => 3;
+}
+";
+            var fixedCode = @"
+class TestClass {
+    ///$$ <summary>
+    /// Provide a <c>value</c>.
+    /// </summary>
+    int Method => 3;
+}
+";
+
+            await VerifyCodeFixAsync(testCode, fixedCode);
+        }
+
         private static async Task VerifyCodeFixAsync(string testCode, string fixedCode)
         {
             int iterations;

DocumentationAnalyzers/DocumentationAnalyzers/Helpers/SymbolExtensions.cs

@@ -43,15 +43,15 @@ public static bool HasAnyTypeParameter(this ISymbol symbol, string name, StringC
                 switch (currentSymbol.Kind)
                 {
                 case SymbolKind.NamedType:
-                    if (((INamedTypeSymbol)symbol).TypeParameters.Any(parameter => comparer.Equals(parameter.Name, name)))
+                    if (((INamedTypeSymbol)currentSymbol).TypeParameters.Any(parameter => comparer.Equals(parameter.Name, name)))
                     {
                         return true;
                     }
 
                     break;
 
                 case SymbolKind.Method:
-                    if (((IMethodSymbol)symbol).TypeParameters.Any(parameter => comparer.Equals(parameter.Name, name)))
+                    if (((IMethodSymbol)currentSymbol).TypeParameters.Any(parameter => comparer.Equals(parameter.Name, name)))
                     {
                         return true;
                     }