Gets or sets the declared message type.
Assembly: System.ServiceModel.Activities (in System.ServiceModel.Activities.dll)
is the data type that will appear on the service description and WSDL. You may want the service description to contain the base class type so that various derived classes can be sent and received by the service at runtime. must be either the same as the argument type of the Message property or its base type.
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.