Define list of a specific type (not object)

Question

I have: - an interface : IMyType - some classes implementing it : MyType1 , MyType2 , MyType3

How can I define a list of type IMyType?

var myList = new List<Type> {typeof (MyType1), typeof (MyType2)};

The above list does not force types to be IMyType type, and I can add any type to the list

Haris Hasan · Accepted Answer · 2011-11-22 07:00:12Z

3

Simply

List<IMyType> list = new List<IMyType>();

Will do the trick you don't need any fancy stuff

answered Nov 22, 2011 at 7:00

Haris Hasan

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Comments

Peter PAD · Accepted Answer · 2011-11-22 07:01:30Z

1

class Program
{
    static void Main(string[] args)
    {
        IList<IMyType> lst = new List<IMyType>();
        lst.Add(new MyType1());
        lst.Add(new MyType2());
        lst.Add(new MyType3());

        foreach (var lstItem in lst)
        {
            Console.WriteLine(lstItem.GetType());
        }
    }
}
public interface IMyType { }
public class MyType1 : IMyType { }
public class MyType2 : IMyType { }
public class MyType3 : IMyType { }

If you want determine what's implementation class, you can use obj.GetType() or operator obj is MyType1

answered Nov 22, 2011 at 7:01

Peter PAD

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2 Comments

Mehrdad Over a year ago

Thank's Peter.Actually I want a list of types, not a list of objects of that type

Peter PAD Over a year ago

You must customize your list and catch exceptions on Add method and Index Property. Because you determine every type in C# inherited Type base

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