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[This documentation is preliminary and is subject to change.]
method ContainsKey - Check to see if a filter key is in the filter list.
Syntax
HRESULT ContainsKey(
  [in]           BSTR key,
  [out, retval]  VARIANT_BOOL *pRetVal
);
Parameters
key [in]
Key to look up in the collection.pRetVal [out, retval]
True if key is found in the collection, else false.
Return value
If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.
Remarks
TBD.
Examples
Requirements
Minimum supported client  | 
Windows Developer Preview | 
Minimum supported server  | 
Windows Server Developer Preview | 
IDL  | 
Windows.Help.Runtime.idl | 
See also
Build date: 9/7/2011