“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

What if you changed your interface to extend IEnumerable so you can enumerate the object and edit the data via the class property.

public interface ISomeData : IEnumerable
{
    IEnumerable Data { get; }
}

public class MyData : ISomeData
{
    private List m_MyData = new List();
    public List Data { get { return m_MyData; }

    public IEnumerator GetEnumerator()
    {
        return Data;
    }

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