Fix int -> enum parameters

Author: mrmonday

ICSharpCode.CodeConverter/CSharp/TypeConversionAnalyzer.cs

@@ -105,6 +105,10 @@ private TypeConversionKind AnalyzeConversion(Microsoft.CodeAnalysis.VisualBasic.
                 }
                 return TypeConversionKind.Implicit;
             }
+            else if (csConversion.IsExplicit && csConversion.IsEnumeration)
+            {
+                return TypeConversionKind.Implicit;
+            }
             else if (csConversion.IsExplicit && vbConversion.IsNumeric && vbType.TypeKind != TypeKind.Enum)
             {
                 return TypeConversionKind.Explicit;

Tests/CSharp/ExpressionTests.cs

@@ -407,6 +407,34 @@ public void Bar(int x)
 }");
         }
 
+        [Fact]
+        public void IntToEnumArg()
+        {
+            TestConversionVisualBasicToCSharpWithoutComments(@"Public Class Class1
+    Sub Foo(ByVal arg As TriState)
+    End Sub
+
+    Sub Main()
+        Foo(0)
+    End Sub
+End Class",
+@"using Microsoft.VisualBasic;
+
+public class Class1
+{
+    public void Foo(TriState arg)
+    {
+    }
+
+    public void Main()
+    {
+        Foo((TriState)0);
+    }
+}");
+        }
+
+
+
         [Fact]
         public void EnumSwitch()
         {