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    <p>I have continued trying to find a solution, and the following is what I ended up doing. The code is cut and paste from various files and presented to give an idea of what I did. It demonstrates how I can call methods which are communicating with ArcGIS using a thread. The code allows me to update the GUI in the main thread, abort the operation, and do post-operation stuff. I ended up using the first threading part from the link I posted initially.</p> <p>The reason for the initial loss of performance is probably due to the single-threaded apartment (STA) which is required by ArcGIS. The Backgroundworker seems to be MTA, thus not appropriate for working with ArcGIS</p> <p>Well here it goes, I hope I haven't forgotten anything, and feel very free to edit my solution. It will both help me and probably also other people developing stuff for ArcGIS.</p> <pre><code>public class Program { private volatile bool AbortOperation; Func&lt;bool&gt; AbortOperationDelegate; FinishProcessDelegate finishDelegate; UpdateGUIDelegate updateGUIDelegate; private delegate void UpdateGUIDelegate(int progress, object message); private delegate void FinishProcessDelegate(); private void cmdBegin_Click(...) { // Create finish delegate, for determining when the thread is done. finishDelegate = new FinishProcessDelegate(ProcessFinished); // A delegate for updating the GUI. updateGUIDelegate = new UpdateGUIDelegate(UpdateGUI); // Create a delegate function for abortion. AbortOperationDelegate = () =&gt; AbortOperation; Thread BackgroundThread = new Thread(new ThreadStart(StartProcess)); // Force single apartment state. Required by ArcGIS. BackgroundThread.SetApartmentState(ApartmentState.STA); BackgroundThread.Start(); } private void StartProcess() { // Update GUI. updateGUIDelegate(0, "Beginning process..."); // Create object. Converter converter = new Converter(AbortOperationDelegate); // Parse the GUI update method to the converter, so it can update the GUI from within the converter. converter.Progress += new ProcessEventHandler(UpdateGUI); // Begin converting. converter.Execute(); // Tell the main thread, that the process has finished. FinishProcessDelegate finishDelegate = new FinishProcessDelegate(ProcessFinished); Invoke(finishDelegate); // Update GUI. updateGUIDelegate(100, "Process has finished."); } private void cmdAbort_Click(...) { AbortOperation = true; } private void ProcessFinished() { // Post processing. } private void UpdateGUI(int progress, object message) { // If the call has been placed at the local thread, call it on the main thread. if (this.pgStatus.InvokeRequired) { UpdateGUIDelegate guidelegate = new UpdateGUIDelegate(UpdateGUI); this.Invoke(guidelegate, new object[] { progress, message }); } else { // The call was made on the main thread, update the GUI. pgStatus.Value = progress; lblStatus.Text = (string)message; } } } public class Converter { private Func&lt;bool&gt; AbortOperation { get; set;} public Converter(Func&lt;bool&gt; abortOperation) { AbortOperation = abortOperation; } public void Execute() { // Calculations using ArcGIS are done here. while(...) // Insert your own criteria here. { // Update GUI, and replace the '...' with the progress. OnProgressChange(new ProgressEventArgs(..., "Still working...")); // Check for abortion at anytime here... if(AbortOperation) { return; } } } public event ProgressEventHandler Progress; private virtual void OnProgressChange(ProgressEventArgs e) { var p = Progress; if (p != null) { // Invoke the delegate. p(e.Progress, e.Message); } } } public class ProgressEventArgs : EventArgs { public int Progress { get; set; } public string Message { get; set; } public ProgressEventArgs(int _progress, string _message) { Progress = _progress; Message = _message; } } public delegate void ProgressEventHandler(int percentProgress, object userState); </code></pre>
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