Assembly: System.ServiceModel (in system.servicemodel.dll)
MessageFilter is an abstract class that developers implement in order to specify the criteria to use for inspecting messages. Typically, filters are used by an endpoint application to determine what to do with a message based on an examination of some part of the message. A queuing process, for example, can use an XPath 1.0 query to check the priority element of a known header to determine whether to move a message to the front of the queue.
Filters are stored in a filter table that implements IMessageFilterTable. Each filter in the table is associated with specified filter data that can be used to indicate what actions to take if a message matches the filter. The Match methods are used to determine if a message satisfies a filter.
The criteria used by a filter cannot be changed once the filter is constructed because the filter tables have no way to detect a change. The only way to modify the criteria of a filter is to construct a new one and delete the existing filter.
The following classes implement the abstractMessageFilter class:
XPathMessageFilter uses an XPath 1.0 expression to specify the criteria for a match.
MatchAllMessageFilter matches all messages.
MatchNoneMessageFilter matches none of the messages.
ActionMessageFilter tests whether the action of a message is one of a specified set of actions.
EndpointAddressMessageFilter tests whether a message satisfies a specified endpoint address.
ChannelListenerBase is an abstract base class that you can use for writing non-queuing listeners.
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.