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Editorial Team
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Asked: 2026-05-26T03:48:12+00:00

I’m using System.ComponentModel.BackgroundWorker to execute some longer running task that – in the end

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I’m using System.ComponentModel.BackgroundWorker to execute some longer running task that – in the end – will update some UI elements.

Questions regarding this:

  • Is BackgroundWorker.RunWorkerCompleted executed on the UI main thread, or in a separate thread? Or asked differently: do I have to embed my code in using(NSAutoReleasePool) and do I have to InvokeOnMainThread() like would have to when using a normal thread?
  • Do I have to use NSAutoReleasePool inside the BackgroundWorker.DoWork delegate?
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1 Answer

  1. Editorial Team

    BackgroundComponentWorker has not been adapted to work on MonoTouch or Mono for Android, so it does not do anything special with the UI thread.

    Any of the events raised are not raised on the UI thread so you need to manually wrap those in BeginInvokeOnMainThread.

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