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ExternalDataEventArgs Class

Represents the data sent when an event is raised using the HandleExternalEventActivity activity.

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

public class ExternalDataEventArgs : EventArgs

A local communication interface marked with ExternalDataExchangeAttribute must declare a type that derives from ExternalDataEventArgs in the interface definition for the corresponding event to be handled in a workflow with a HandleExternalEventActivity activity.

An event class that inherits from ExternalDataEventArgs must implement a constructor that uses the :base(instanceId) constructor. In addition, the new event class must be marked as Serializable as shown in the following code.

public class TaskEventArgs : ExternalDataEventArgs
    private string orderName;

    public TaskEventArgs(Guid instanceId, string id)
        orderName = id;

    public string Id
        get { return orderName; }
        set { orderName = value; }


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

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0