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VB -> C#: Conversion functions are not correctly translated #343

tverweij opened this issue Aug 2, 2019 · 2 comments


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commented Aug 2, 2019

Input code

Dim x As Integer = CInt(SomeObject)

Erroneous output

private int MyInt = System.Convert.ToInt32(SomeObject);

Expected output

private int MyInt = Microsoft.VisualBasic.CompilerServices.Conversions.ToGenericParameter<int>(SomeObject);;


Product in use: web converter

Version in use:

This is not really convertable (as far as I know not documented anywhere), so the only way to convert this correctly is to use the Microsoft.VisualBasic.dll


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commented Aug 2, 2019

Thanks! Other test cases #327 and #331, I'll consolidate those issues into this more generally titled one


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commented Aug 3, 2019

If someone else wants to work on this, it's this method which determines the method invoked:

var systemDotConvert = ConvertType.FullName;
var convertMethods = semanticModel.Compilation.GetTypeByMetadataName(systemDotConvert).GetMembers().Where(m =>
m.Name.StartsWith("To", StringComparison.Ordinal) && m.GetParameters().Length == 1);
var methodsByType = convertMethods.Where(m => m.Name != nameof(Convert.ToBase64String))
.GroupBy(m => new { ReturnType = m.GetReturnType(), Name = $"{systemDotConvert}.{m.Name}" })
.ToDictionary(m => m.Key.ReturnType, m => m.Key.Name);
return methodsByType;

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