GetUniqueObjectForIUnknown Method
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Marshal.GetUniqueObjectForIUnknown Method (IntPtr)


Creates a unique Runtime Callable Wrapper (RCW) object for a given IUnknown interface.

Namespace:   System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)

public static object GetUniqueObjectForIUnknown(
	IntPtr unknown


Type: System.IntPtr

A managed pointer to an IUnknown interface.

Return Value

Type: System.Object

A unique RCW for the specified IUnknown interface.

The GetUniqueObjectForIUnknown method ensures that you receive a unique RCW, because it does not match an IUnknown pointer to an existing object. Use this method when you have to create a unique RCW that is not impacted by other code that calls the ReleaseComObject method.


requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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