# System.Runtime.InteropServices

``` diff
 namespace System.Runtime.InteropServices {
+    public sealed class DynamicInterfaceCastableImplementationAttribute : Attribute {
+        public DynamicInterfaceCastableImplementationAttribute();
+    }
+    public interface IDynamicInterfaceCastable {
+        RuntimeTypeHandle GetInterfaceImplementation(RuntimeTypeHandle interfaceType);
+        bool IsInterfaceImplemented(RuntimeTypeHandle interfaceType, bool throwIfNotImplemented);
+    }
 }
```

