How to check that current type (object of Type) has needed interface (or parent type)

Question

I've a some type (object of Type). Need to check that this type has interface IList.
How I can do this?

Answer 1

You can use the Type.GetInterface method.

if (object.GetType().GetInterface("IList") != null)
{
    // object implements IList
}

Answer 2

I think the easiest way is to use IsAssignableFrom.

So from your example:

Type customListType = new YourCustomListType().GetType();

if (typeof(IList).IsAssignableFrom(customListType))
{
    //Will be true if "YourCustomListType : IList"
}

Answer 3

Assuming you have an object type with the type System.Type (what I gathered from the OP),

Type type = ...;
typeof(IList).IsAssignableFrom(type)