GetComInterfaceForObjectInContext Method
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Marshal.GetComInterfaceForObjectInContext Method

Returns an interface pointer that represents the specified interface for an object, if the caller is in the same context as that object.

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

[SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
public static IntPtr GetComInterfaceForObjectInContext(
	Object o,
	Type t


Type: System.Object

The object that provides the interface.

Type: System.Type

The Type of interface that is requested.

Return Value

Type: System.IntPtr
The interface pointer specified by t that represents the interface for the specified object, or null if the caller is not in the same context as the object.


t is not an interface.


The type is not visible to COM.


o does not support the requested interface.


o is null.


t is null.

This method is the same as GetComInterfaceForObject except that it returns null if the caller is not in the same context as the object. It is particularly useful if you have an unmanaged method that expects to be passed an interface pointer.


This method uses SecurityAction.LinkDemand to prevent it from being called from untrusted code; only the immediate caller is required to have SecurityPermissionAttribute.UnmanagedCode permission. If your code can be called from partially trusted code, do not pass user input to Marshal class methods without validation. For important limitations on using the LinkDemand member, see Demand vs. LinkDemand.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0

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