How to determine if a type implements an interface with C# reflection

You have a few choices:

1. typeof(IMyInterface).IsAssignableFrom(typeof(MyType))

2. typeof(MyType).GetInterfaces().Contains(typeof(IMyInterface))

For a generic interface, it’s a bit different.

typeof(MyType).GetInterfaces().Any(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IMyInterface<>))

Use Type.IsAssignableFrom:

typeof(IMyInterface).IsAssignableFrom(typeof(MyType));

typeof(IMyInterface).IsAssignableFrom(someclass.GetType());

or

typeof(IMyInterface).IsAssignableFrom(typeof(MyType));