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PODelegate, BeginInvoke. EndInvoke - How to clean up multiple Async threat calls to the same delegate?
 

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    <p>I've created a Delegate that I intend to call Async. </p> <h2>Module Level</h2> <pre><code>Delegate Sub GetPartListDataFromServer(ByVal dvOriginal As DataView, ByVal ProgramID As Integer) Dim dlgGetPartList As GetPartListDataFromServer </code></pre> <h2>The following code I use in a method</h2> <pre><code> Dim dlgGetPartList As New GetPartListDataFromServer(AddressOf AsyncThreadMethod_GetPartListDataFromServer) dlgGetPartList.BeginInvoke(ucboPart.DataSource, ucboProgram.Value, AddressOf AsyncCallback_GetPartListDataFromServer, Nothing) </code></pre> <p>The method runs and does what it needs to</p> <h2>The Asyn callback is fired upon completion where I do an EndInvoke</h2> <pre><code>Sub AsyncCallback_GetPartListDataFromServer(ByVal ar As IAsyncResult) dlgGetPartList.EndInvoke(Nothing) End Sub </code></pre> <p>It works as long as the method that starts the BeginInvoke on the delegate only ever runs while there is not a BeginInvoke/Thread operation already running. Problem is that the a new thread could be invoked while another thread on the delegate is still running and hasnt yet been EndInvoke'd. </p> <p>The program needs to be able to have the delegate run in more than one instance at a time if necessary and they all need to complete and have EndInvoke called. Once I start another BeginInvoke I lose the reference to the first BeginInvoke so I am unable to clean up the new thread with an EndInvoke. </p> <p>What is a clean solution and best practice to overcome this problem?</p>
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