Merge pull request #1250 from GrahamTheCoder/claude/fix-issue-1091-default-member-strip

Add regression test for issue #1091: interface DefaultMember Value access

Author: GrahamTheCoder

Tests/CSharp/MemberTests/DefaultMemberAttributeTests.cs

@@ -49,6 +49,45 @@ public void S()
         y.Caption = ""World"";
     }
 }
+");
+    }
+
+    /// <summary>
+    /// Regression test for https://github.com/icsharpcode/CodeConverter/issues/1091
+    /// When an interface has [DefaultMember(""Value"")] and VB code explicitly accesses .Value,
+    /// the converter must NOT strip the .Value member access in the C# output.
+    /// </summary>
+    [Fact]
+    public async Task Issue1091_ExplicitAccessToDefaultMemberPropertyIsPreservedAsync()
+    {
+        await TestConversionVisualBasicToCSharpAsync(
+            @"
+<System.Reflection.DefaultMember(""Value"")>
+Public Interface IWithDefaultValue
+    Property Value As Object
+End Interface
+
+Public Module Module1
+    Sub Test(p As IWithDefaultValue)
+        Dim v = p.Value
+        p.Value = v
+    End Sub
+End Module", @"using System.Reflection;
+
+[DefaultMember(""Value"")]
+public partial interface IWithDefaultValue
+{
+    object Value { get; set; }
+}
+
+public static partial class Module1
+{
+    public static void Test(IWithDefaultValue p)
+    {
+        var v = p.Value;
+        p.Value = v;
+    }
+}
 ");
     }
 }