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Marshal.FinalReleaseComObject Method

Releases all references to a Runtime Callable Wrapper (RCW) by setting its reference count to 0.

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

public static int FinalReleaseComObject(
	Object o
)

Parameters

o
Type: System.Object

The RCW to be released.

Return Value

Type: System.Int32
The new value of the reference count of the RCW associated with the oparameter, which is 0 (zero) if the release is successful.

ExceptionCondition
ArgumentException

o is not a valid COM object.

ArgumentNullException

o is null.

The FinalReleaseComObject method releases the managed reference to a COM object. Calling this method is equivalent to calling the ReleaseComObject method in a loop until it returns 0 (zero).

When the reference count on the COM object becomes 0, the COM object is usually freed, although this depends on the COM object's implementation and is beyond the control of the runtime. However, the RCW can still exist, waiting to be garbage-collected.

The COM object cannot be used after it has been separated from its underlying RCW. If you try to call a method on the RCW after its reference count becomes 0, a InvalidComObjectException will be thrown.

.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

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.

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