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ServiceHostBase.UnknownMessageReceived Event

Occurs when an unknown message is received.

Namespace:  System.ServiceModel
Assembly:  System.ServiceModel (in System.ServiceModel.dll)
public event EventHandler<UnknownMessageReceivedEventArgs> UnknownMessageReceived
Caution noteCaution

When using WorkflowServiceHost, exposing a hosting endpoint, and a UnknownMessageReceived exception is thrown, the host passes the message to the event handler. If an attempt is made to read this message an InvalidOperationException is thrown. The description of the exception will say “This message cannot support the operation because it has been read.” The WCF infrastructure reads the message while extracting the message parameters. This message is then passed to the event handler and any attempt to read it causes an exception. If you need to access message parameters in your InvalidOperationException handler from a hosting endpoint, define the hosting endpoint contract using MessageContract and place the needed data into a message header. For more information about hosting endpoints see Workflow Service Host Extensibility

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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