How to resolve the issue of WPF calling thread unable to access this object?

In a WPF application, an error will occur stating “The calling thread cannot access this object because a different thread owns it” when trying to access UI elements from a non-UI thread.

There are two methods to solve this problem:

  1. Utilize the Dispatcher object:
    In a non-UI thread, utilize the Dispatcher object to schedule UI operations. The Dispatcher object is a reference to the UI thread, which can be used to send operations to the UI thread for execution. For example:
  2. Execute the operation on the UI thread using Application.Current.Dispatcher.Invoke.
  3. Alternatively, you can use the BeginInvoke method of the Dispatcher, which is asynchronous.
  4. Invoke an action on the UI thread using Application.Current.Dispatcher.
  5. Update the UI with a background thread:
    For long-running non-UI operations, you can use a background thread to perform the operation and then update the results to the UI thread using a Dispatcher object once the operation is complete. For example:
  6. Run a task on a background thread and then continue with updating the UI on the UI thread by invoking Application.Current.Dispatcher.

It is important to avoid performing time-consuming tasks on the UI thread, as it can lead to the blocking of the UI thread and cause the application to become unresponsive.

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