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POPausing a new BackGroundWorker until previous completes
 

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    <p>I am struggling with threading. The problem is when I am iterating trough foreach loop.</p> <p>When setting <code>this.Document</code>, the application performs login, that is triggered with an event and takes few seconds to complete. In the <code>worker_RunWorkerCompleted</code> method I need to perform some actions that depend on current login information.</p> <p>The problem is that before I can perform this action for the first file, the <code>this.Document</code> already changes making the application perform another login. This way I can never actually perform my actions.</p> <p>My question is: How can I pause the next thread until previous thread has completed. Is there any other solution to my problem?</p> <p>I tried with <code>AutoResetEvent</code> but I got no luck. I set <code>waitOne()</code> just after the RunWorkerAsync call and <code>.Set()</code> in the RunWorkerCompleted. The code never gets to <code>RunWorkerCompleted</code>...</p> <p>Here is the code:</p> <pre><code> public void Start(object obj) { try { foreach (KeyValuePair&lt;string, Stream&gt; pair in this.CollectionOfFiles) { Worker = new BackgroundWorker(); Worker.DoWork += new DoWorkEventHandler(worker_DoWork); Worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted); using (Stream stream = pair.Value) { primaryDocument = new Document(stream); DataHolderClass dataHolder = new DataHolderClass(); dataHolder.FileName = pair.Key; dataHolder.Doc = secondaryDocument; //background thread call Worker.RunWorkerAsync(dataHolder); } } } catch (Exception ex) { // exception logic } finally { // complete logic } } private void worker_DoWork(object sender, DoWorkEventArgs e) { DataHolderClass dataHolder = ((DataHolderClass)e.Argument); // setting this attribute triggers execution of login event this.Document = dataHolder.Doc; e.Result = (dataHolder); } private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { // here I need to perform some actions that are depending on the current login DataHolderClass dataHolder = ((DataHolderClass)e.Result); this.eventAggregator.GetEvent&lt;ActionEvent&gt;().Publish(new Message(EMessageType.Info) { Title = dataHolder.FileName }); } </code></pre>
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    1. COIt was buisy when Worker.RunWorkerAsync(dataHolder); was hit again...
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    2. CODo I get this right? Setting Document triggers Start somehow?
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    3. COnot... setting Document triggers login action (it is not shown here). And when I am in the worker_RunWorkerCompleted i need to do some action that check login. Login takes few seconds to complete and its an event based call. My situation is that when I get to worker_RunWorkerCompleted the login already changes since another item in collection sets this.Document...
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