Fix: Cast Enum to integer when assigning to non-convertible types

- Update TypeConversionAnalyzer to only use EnumCastThenConversion if the target type is not an Enum and does not have a defined Conversions.To method.
- Add tests covering the reported issue (implicitly casting Enum to custom struct expecting int) and ensuring Enum-to-Boolean logic remains intact without extra (long) casts.

Co-authored-by: GrahamTheCoder <2490482+GrahamTheCoder@users.noreply.github.com>

Author: google-labs-jules[bot]

CodeConverter/CSharp/TypeConversionAnalyzer.cs

@@ -165,9 +165,14 @@ public TypeConversionKind AnalyzeConversion(VBSyntax.ExpressionSyntax vbNode, bo
                 return TypeConversionKind.Identity;
             }
 
-            if (!vbConvertedType.IsEnumType()) {
+            if (vbConvertedType.SpecialType == SpecialType.System_String) {
                 return TypeConversionKind.EnumCastThenConversion;
             }
+
+            if (!vbConvertedType.IsEnumType() && !ExpressionEvaluator.ConversionsTypeFullNames.ContainsKey(vbConvertedType.GetFullMetadataName())) {
+                return TypeConversionKind.EnumCastThenConversion;
+            }
+
             return TypeConversionKind.Conversion;
         }
 

Tests/CSharp/ExpressionTests/ExpressionTests.cs

@@ -1,4 +1,4 @@
-using System.Threading.Tasks;
+using System.Threading.Tasks;
 using ICSharpCode.CodeConverter.Tests.TestRunners;
 using Xunit;
 
@@ -2931,7 +2931,6 @@ public object Edit(bool flag2 = false, CrashEnum? crashEnum = default)
     }
 }");
     }
-
     [Fact]
     public async Task Issue1211_EnumToCustomTypeImplicitConversionAsync()
     {
@@ -2999,4 +2998,32 @@ public void Foo()
 }");
     }
 
+    [Fact]
+    public async Task EnumToBooleanAsync()
+    {
+        await TestConversionVisualBasicToCSharpAsync(
+            @"Public Class C
+    Public Sub M(e As ESByte)
+        Dim vBooleanSByte As Boolean = e
+    End Sub
+End Class
+
+Public Enum ESByte As Long
+    M1 = 1
+End Enum",
+            @"using Microsoft.VisualBasic.CompilerServices; // Install-Package Microsoft.VisualBasic
+
+public partial class C
+{
+    public void M(ESByte e)
+    {
+        bool vBooleanSByte = Conversions.ToBoolean(e);
+    }
 }
+
+public enum ESByte : long
+{
+    M1 = 1L
+}");
+    }
+}