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SetStateEventArgs Class

Note: This API is now obsolete.

Represents a class that is used as an argument to set the state of a StateMachineWorkflowActivity.

Namespace:   System.Workflow.Activities
Assembly:  System.Workflow.Activities (in System.Workflow.Activities.dll)


[ObsoleteAttribute("The System.Workflow.* types are deprecated.  Instead, please use the new types from System.Activities.*")]
public class SetStateEventArgs : EventArgs


Initializes a new instance of the SetStateEventArgs class.


Gets the state to set the StateActivity to.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Serves as the default hash function. (Inherited from Object.)


Gets the Type of the current instance.(Inherited from Object.)


Creates a shallow copy of the current Object.(Inherited from Object.)


Returns a string that represents the current object.(Inherited from Object.)


This material discusses types and namespaces that are obsolete. For more information, see Deprecated Types in Windows Workflow Foundation 4.5.

The StateMachineWorkflowActivity allows for setting the state from the host application. This enables the host application to override the current state of a state machine. This can be accomplished by enqueuing an instance of the SetStateEventArgs class to the WorkflowQueue named by the constant StateMachineWorkflowActivity.SetStateQueueName.

A simpler way to accomplish this is to use the SetState method in the StateMachineWorkflowInstance class.

You can use the SetState method to perform a SetState operation from the host, or you can do it yourself by enqueuing an event to the state machine workflow as shown in the following example.

public void SetState(string targetStateName)
      if (targetStateName == null)
            throw new ArgumentNullException("targetStateName");
      SetStateEventArgs args1 = new SetStateEventArgs(targetStateName);
      this.WorkflowInstance.EnqueueItemOnIdle("SetStateQueue", args1, null, null);

The state machine workflow uses a special queue called SetStateQueue to listen to these special events.

.NET Framework
Available since 3.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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