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ICustomQueryInterface Interface

Enables developers to provide a custom, managed implementation of the IUnknown::QueryInterface(REFIID riid, void **ppvObject) method.

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

[ComVisibleAttribute(false)]
public interface ICustomQueryInterface

The ICustomQueryInterface type exposes the following members.

  NameDescription
Public methodGetInterfaceReturns an interface according to a specified interface ID.
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This class permits advanced users to provide a customized managed implementation of the QueryInterface method.

Managed and native applications can use the customized implementation to return a specific interface for a specified interface ID, except for IID_IUnknown. That is, when QueryInterface is called, it will ignore custom implementations if its riid parameter is set to IID_IUnknown. However, you may still return IUnknown as the ppvObject.

Developers can provide custom implementations for all interfaces (except for IUnknown) if they define and implement a valid corresponding interface.

A valid user-defined interface has a v-table layout that matches the unmanaged COM interface exactly, and its InterfaceTypeAttribute is InterfaceIsIUnknown.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, 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.

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