How do i convert a List to List in c#

Question

I have an interface defined as

public interface IReaderInfo
{
    string Displayname {get;}
}

and a class that implements that interface

Answer 1

You have to create a new list with casted items:

var readers = Ireaders.Cast().ToList();

Or, if there is a possibility to have incompatible IReaderInfo entries and you only want the actual ReaderInfo objects in the result:

var readers = Ireaders.OfType().ToList();