ICustomQueryInterface Interface
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Enables developers to provide a custom, managed implementation of the IUnknown::QueryInterface(REFIID riid, void **ppvObject) method.
Assembly: mscorlib (in mscorlib.dll)
The ICustomQueryInterface type exposes the following members.
| Name | Description | |
|---|---|---|
 | GetInterface | Security Critical. Returns an interface according to a specified interface ID. |
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.