GetIUnknownForObjectInContext Method
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Marshal.GetIUnknownForObjectInContext Method (Object)


Returns an IUnknown interface from a managed object, if the caller is in the same context as that object.

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

public static IntPtr GetIUnknownForObjectInContext(
	object o


Type: System.Object

The object whose IUnknown interface is requested.

Return Value

Type: System.IntPtr

The IUnknown pointer for the specified object, or null if the caller is not in the same context as the specified object.

This method is the same as GetIUnknownForObject except that it returns null if the caller is not in the same context as the object.

The following example demonstrates how to retrieve an IUnknown interface for a managed object using the GetIUnknownForObjectInContext method.

using System;
using System.Runtime.InteropServices;

class Program

    static void Run()

        // Create an int object
        int obj = 1;

        Console.WriteLine("Calling Marshal.GetIUnknownForObjectInContext...");

        // Get the IUnKnown pointer for the Integer object
        IntPtr pointer = Marshal.GetIUnknownForObjectInContext(obj);

        Console.WriteLine("Calling Marshal.Release...");

        // Always call Marshal.Release to decrement the reference count.

    static void Main(string[] args)


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

.NET Framework
Available since 2.0
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