Question

I am having a small issue converting some C# code to VB.NET. I am working with this online blog: http://refactorthis.wordpress.com/2011/05/31/mock-faking-dbcontext-in-entity-framework-4-1-with-a-generic-repository/

In the part about creating a fake in memory IDBSet, it has the following code:

System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
    return _data.GetEnumerator();
}

IEnumerator<T> IEnumerable<T>.GetEnumerator()
{
    return _data.GetEnumerator();
}

Using a code translator renders the following:

Private Function GetEnumerator() As IEnumerator Implements System.Collections.IEnumerable.GetEnumerator
    Return _data.GetEnumerator()
End Function

Private Function GetEnumerator() As IEnumerator(Of T) Implements IEnumerable(Of T).GetEnumerator
    Return _data.GetEnumerator()
End Function

It appears to me as a correct translation, but DB.Net is complaing with the following error: Private Function GetEnumerator … and Private Function GetEnumerator … cannot overload each other because they differ only by return types. Both are required to implement IDBSet.

Any ideas on how to correctly convert this code?

Answer 1

Since they’re both Private, just change the name of one of them. The important part is that they implement their respective interface methods. This would work:

Private Function IEnumerator_GetEnumerator() As IEnumerator Implements System.Collections.IEnumerable.GetEnumerator
    Return _data.GetEnumerator()
End Function

Private Function GetEnumerator() As IEnumerator(Of T) Implements IEnumerable(Of T).GetEnumerator
    Return _data.GetEnumerator()
End Function