Remove usage of TypeSwitch.

src/Workspaces/Core/Portable/Shared/Extensions/ObjectExtensions.TypeSwitch.cs

@@ -8,22 +8,6 @@ internal static partial class ObjectExtensions
     {
         #region TypeSwitch on Func<T>
 
-        public static TResult TypeSwitch<TBaseType, TDerivedType1, TResult>(this TBaseType obj, Func<TDerivedType1, TResult> matchFunc1, Func<TBaseType, TResult> defaultFunc = null) where TDerivedType1 : TBaseType
-        {
-            if (obj is TDerivedType1)
-            {
-                return matchFunc1((TDerivedType1)obj);
-            }
-            else if (defaultFunc != null)
-            {
-                return defaultFunc(obj);
-            }
-            else
-            {
-                return default(TResult);
-            }
-        }
-
         public static TResult TypeSwitch<TBaseType, TDerivedType1, TDerivedType2, TResult>(this TBaseType obj, Func<TDerivedType1, TResult> matchFunc1, Func<TDerivedType2, TResult> matchFunc2, Func<TBaseType, TResult> defaultFunc = null)
             where TDerivedType1 : TBaseType
             where TDerivedType2 : TBaseType

src/Workspaces/VisualBasic/Portable/CodeCleanup/Providers/AddMissingTokensCodeCleanupProvider.vb

@@ -521,9 +521,14 @@ Namespace Microsoft.CodeAnalysis.CodeCleanup.Providers
 
             Private Function ProcessOmittedToken(originalToken As SyntaxToken, token As SyntaxToken, parent As SyntaxNode) As SyntaxToken
                 ' multiline if statement with missing then keyword case
-                If parent.TypeSwitch(Function(p As IfStatementSyntax) Exist(p.Condition) AndAlso p.ThenKeyword = originalToken) Then
-                    Return If(parent.GetAncestor(Of MultiLineIfBlockSyntax)() IsNot Nothing, CreateOmittedToken(token, SyntaxKind.ThenKeyword), token)
-                ElseIf TryCast(parent, IfDirectiveTriviaSyntax)?.ThenKeyword = originalToken Then
+                If TypeOf parent Is IfStatementSyntax Then
+                    Dim ifStatement = DirectCast(parent, IfStatementSyntax)
+                    If Exist(ifStatement.Condition) AndAlso ifStatement.ThenKeyword = originalToken Then
+                        Return If(parent.GetAncestor(Of MultiLineIfBlockSyntax)() IsNot Nothing, CreateOmittedToken(token, SyntaxKind.ThenKeyword), token)
+                    End If
+                End If
+
+                If TryCast(parent, IfDirectiveTriviaSyntax)?.ThenKeyword = originalToken Then
                     Return CreateOmittedToken(token, SyntaxKind.ThenKeyword)
                 ElseIf TryCast(parent, ElseIfStatementSyntax)?.ThenKeyword = originalToken Then
                     Return If(parent.GetAncestor(Of ElseIfBlockSyntax)() IsNot Nothing, CreateOmittedToken(token, SyntaxKind.ThenKeyword), token)