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

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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<>))

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