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Marshal.GetComObjectData Method

Retrieves data that is referenced by the specified key from the specified COM object.

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

public static Object GetComObjectData(
	Object obj,
	Object key


Type: System.Object
The COM object that contains the data that you want.
Type: System.Object
The key in the internal hash table of obj to retrieve the data from.

Return Value

Type: System.Object
The data represented by the key parameter in the internal hash table of the obj parameter.


obj is null.


key is null.


obj is not a COM object.

All COM objects wrapped in a Runtime Callable Wrapper have an associated hash table, which GetComObjectData retrieves. Marshal.SetComObjectData adds data to the hash table. You should never have to call either method from your code.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

  • SecurityCriticalAttribute 

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

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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