Marshal.GetActiveObject Method

Obtains a running instance of the specified object from the Running Object Table (ROT).

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

public static Object GetActiveObject (
	string progID
public static Object GetActiveObject (
	String progID
public static function GetActiveObject (
	progID : String
) : Object



The ProgID of the object being requested.

Return Value

The object requested. You can cast this object to any COM interface that it supports.

Marshal.GetActiveObject exposes the GetActiveObject COM API method from OLEAUT32.DLL; however, the latter expects a class identifier (CLSID) instead of the programmatic identifier (ProgID) expected by this method. To obtain a running instance of a COM object without a registered ProgID, use platform invoke to define the GetActivateObject COM method. For a description of platform invoke, see Consuming Unmanaged DLL Functions. For additional information about the GetActiveObject COM method, see the MSDN Library.


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

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

.NET Framework

Supported in: 2.0, 1.1, 1.0