Convert C# tuples to VB tuples - fixes #120

Author: GrahamTheCoder

ICSharpCode.CodeConverter/VB/NodesVisitor.cs

@@ -636,6 +636,26 @@ public override VisualBasicSyntaxNode VisitBracketedParameterList(CSS.BracketedP
             return SyntaxFactory.ParameterList(SyntaxFactory.SeparatedList(node.Parameters.Select(p => (ParameterSyntax)p.Accept(TriviaConvertingVisitor))));
         }
 
+        public override VisualBasicSyntaxNode VisitTupleType(CSS.TupleTypeSyntax node)
+        {
+            var elements = node.Elements.Select(e => (TupleElementSyntax)e.Accept(TriviaConvertingVisitor));
+            return SyntaxFactory.TupleType(SyntaxFactory.SeparatedList(elements));
+        }
+
+        public override VisualBasicSyntaxNode VisitTupleElement(CSS.TupleElementSyntax node)
+        {
+            return SyntaxFactory.TypedTupleElement((TypeSyntax)node.Type.Accept(TriviaConvertingVisitor));
+        }
+
+        public override VisualBasicSyntaxNode VisitTupleExpression(CSS.TupleExpressionSyntax node)
+        {
+            var args = node.Arguments.Select(a => {
+                var expr = (ExpressionSyntax)a.Expression.Accept(TriviaConvertingVisitor);
+                return SyntaxFactory.SimpleArgument(expr);
+            });
+            return SyntaxFactory.TupleExpression(SyntaxFactory.SeparatedList(args));
+        }
+
         public override VisualBasicSyntaxNode VisitParameter(CSS.ParameterSyntax node)
         {
             var id = CommonConversions.ConvertIdentifier(node.Identifier);

Tests/VB/ExpressionTests.cs

@@ -339,6 +339,19 @@ Return New Object() Is New Object()
 End Function");
         }
 
+        [Fact]
+        public void TupleType()
+        {
+            TestConversionCSharpToVisualBasic(@"public interface ILanguageConversion 
+{
+    IReadOnlyCollection<(string, string)> GetProjectTypeGuidMappings();
+    IEnumerable<(string, string)> GetProjectFileReplacementRegexes();
+}", @"Public Interface ILanguageConversion
+    Function GetProjectTypeGuidMappings() As IReadOnlyCollection(Of (String, String))
+    Function GetProjectFileReplacementRegexes() As IEnumerable(Of (String, String))
+End Interface");
+        }
+
         [Fact]
         public void DelegateExpression()
         {