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

Does reflection in C# offer a way to determine if some given System.Type type models some interface?

public interface IMyInterface {}

public class MyType : IMyInterface {}

// should yield 'true'
typeof(MyType)./* ????? */MODELS_INTERFACE(IMyInterface);
over 4 years ago · Santiago Trujillo
3 answers
Answer question

0

You have a few choices:

  1. typeof(IMyInterface).IsAssignableFrom(typeof(MyType))
  2. typeof(MyType).GetInterfaces().Contains(typeof(IMyInterface))
  3. With C# 6 you can use typeof(MyType).GetInterface(nameof(IMyInterface)) != null

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

typeof(MyType).GetInterfaces().Any(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IMyInterface<>))
over 4 years ago · Santiago Trujillo Report

0

Use Type.IsAssignableFrom:

typeof(IMyInterface).IsAssignableFrom(typeof(MyType));
over 4 years ago · Santiago Trujillo Report

0

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

or

typeof(IMyInterface).IsAssignableFrom(typeof(MyType));
over 4 years ago · Santiago Trujillo Report
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