System.__ComObject.CreateIUnknown C# (CSharp) Method

		internal static IntPtr CreateIUnknown(Type t)
		{
			System.Runtime.CompilerServices.RuntimeHelpers.RunClassConstructor (t.TypeHandle);

			IntPtr iunknown;
			ObjectCreationDelegate ocd = ExtensibleClassFactory.GetObjectCreationCallback (t);
			if (ocd != null) {
				iunknown = ocd (IntPtr.Zero);
				if (iunknown == IntPtr.Zero)
					throw new COMException (string.Format("ObjectCreationDelegate for type {0} failed to return a valid COM object", t));
			}
			else {
				int hr = CoCreateInstance (GetCLSID (t), IntPtr.Zero, 0x1 | 0x4 | 0x10, IID_IUnknown, out iunknown);
				Marshal.ThrowExceptionForHR (hr);
			}

			return iunknown;
		}