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WorkflowApplication.BeginUnload Method (AsyncCallback, Object)

Persists and disposes a workflow instance asynchronously using the specified callback method and user-provided state.

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

member BeginUnload : 
        callback:AsyncCallback * 
        state:Object -> IAsyncResult


Type: System.AsyncCallback

The method to be called when the BeginUnload operation has completed.

Type: System.Object

An optional application-specific object that contains information about the asynchronous operation.

Return Value

Type: System.IAsyncResult
A reference to the asynchronous BeginUnload operation.

To determine whether the BeginUnload operation was successful, call EndUnload. EndUnload can be called from inside or outside of the method reference in the callback parameter. If EndUnload is called before the BeginUnload operation completes, it blocks until the BeginUnload operation completes. By default, the BeginUnload operation must complete in 30 seconds or a TimeoutException is thrown from EndUnload.

If the workflow instance was previously loaded from persistence, then the same InstanceStore used to load the workflow is used for persistence. If the workflow was created and has not yet been persisted, then an InstanceStore must be configured before calling this method or else an InvalidOperationException is thrown when this method is called.

This method persists and disposes a workflow instance asynchronously using the IAsyncResult asynchronous design pattern. For more information, seeAsynchronous Programming Overview.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4

.NET Framework Client Profile

Supported in: 4

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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