All entries for Monday 03 October 2005

October 03, 2005

Breaking Generics in .NET

Consider this simple VB.NET console application:
Module Module1

Sub Main()
Dim baseType As Type = GetType(BaseTest(Of IParameter))
Dim childType As Type = GetType(SubTest)
Dim foo As Boolean = baseType.IsAssignableFrom(childType)
If foo Then
Console.WriteLine("Everything is fine")
Console.WriteLine("WTF?! baseType is NOT assignable from childType!")
End If

End Sub

End Module

Interface ITest

End Interface

Class BaseTest(Of T As IParameter)
Implements ITest

End Class

Class SubTest
Inherits BaseTest(Of Parameter)

End Class

Interface IParameter

End Interface

Class Parameter
Implements IParameter
End Class

Some how SubTest cannot be casted to BaseTest(Of IParameter)

Any ideas?

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