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Marshal.GetUniqueObjectForIUnknown Method

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.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

  • SecurityCriticalAttribute 

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

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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