“Interface not implemented” when Returning Derived Type

Question

The following code:

public interface ISomeData
{
    IEnumerable Data { get; }
}

public class MyData : ISomeData
{
    private List

        

Answer 1

Hmm, is it a shortcoming, I would say no.

In either way, I would work around it like darin's answer, or, if you explicitly want a List accessor as well, you could do it like this:

public class MyData : ISomeData
{

    IEnumerable ISomeData.Data
    {
        get
        {
              return _myData;
        }
    }

    public List Data
    {
          get
          {
             return (List)((ISomeData)this).Data;
          }
    }

}