NGWS SDK Documentation  

This is preliminary documentation and subject to change.
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20.1.15 The NoIDispatch attribute

The presence of the NoIDispatch attribute indicates that the class or interface should derive from IUnknown rather than IDispatch when exported to COM.

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Interface)]
public class NoIDispatchAttribute: System.Attribute
{
   public NoIDispatchAttribute() {…}
}