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Marshal.SetComObjectData Method

Sets data referenced by the specified key in the specified COM object.

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

Public Shared Function SetComObjectData ( _
	obj As Object, _
	key As Object, _
	data As Object _
) As Boolean


Type: System.Object
The COM object in which to store the data.
Type: System.Object
The key in the internal hash table of the COM object in which to store the data.
Type: System.Object
The data to set.

Return Value

Type: System.Boolean
true if the data was set successfully; otherwise, false.


obj is Nothing.


key is Nothing.


obj is not a COM object.

All COM objects wrapped in a Runtime Callable Wrapper (RCW) have an associated hash table, to which SetComObjectData adds data. Marshal.GetComObjectData retrieves data from 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.