Assembly: mscorlib (in mscorlib.dll)
'Declaration Public Shared Function Release ( _ pUnk As IntPtr _ ) As Integer 'Usage Dim pUnk As IntPtr Dim returnValue As Integer returnValue = Marshal.Release(pUnk)
The interface to release.
Return ValueThe new value of the reference count on the interface specified by the pUnk parameter.
The common language runtime manages the reference count of a COM object for you, making it unnecessary to use this method directly. Use this value only for testing purposes. In rare cases, such as testing a custom marshaler, you might find it necessary to manipulate an object's lifetime manually. Only programs that call Marshal.AddRef should call Release. Calling Release after the reference count has reached zero causes undefined behavior.
You can call Marshal.GetComInterfaceForObject, Marshal.GetIUnknownForObject, or Marshal.GetIDispatchForObject to obtain an IntPtr value that represents a IUnknown interface pointer to release. You can also use these methods and the Release method on managed objects to release the COM interfaces represented by the managed object's COM callable wrapper. If you are not familiar with the details of this wrapper type, see COM Callable Wrapper.
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.
The following code example demonstrates how to retrieve an IUnknown interface for a managed object using the GetIUnknownForObject method. The code example then releases the interface pointer by calling the Release method.
Imports System.Runtime.InteropServices Module Program Sub Run() ' Dim an Integer object Dim IntegerObject As Integer = 1 ' Dim a pointer Dim pointer As IntPtr Console.WriteLine("Calling Marshal.GetIUnknownForObject...") ' Get the IUnKnown pointer for the Integer object pointer = Marshal.GetIUnknownForObject(IntegerObject) Console.WriteLine("Calling Marshal.Release...") ' Always call Marshal.Release to decrement the reference count. Marshal.Release(pointer) End Sub Sub Main(ByVal args() As String) Run() End Sub End Module
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.