// THIS METHOD RUNS ON A SECONDARY UI THREAD (THREAD WITH A DISPATCHER)
private void MethodRunningOnSecondaryUIThread()
{
var secondaryUiThreadId = Thread.CurrentThread.ManagedThreadId;
try
{
// On secondary thread, show a new Window before starting a new Dispatcher
// ie turn secondary thread into a UI thread
var window = new SecondaryUIThreadWindow();
window.Show();
Dispatcher.Run();
}
catch (Exception ex)
{
// Dispatch the exception back to the main ui thread and reraise it
Application.Current.Dispatcher.Invoke(
DispatcherPriority.Send,
(DispatcherOperationCallback) delegate
{
// THIS CODE RUNS BACK ON THE MAIN UI THREAD
string msg = $"Exception forwarded from secondary UI thread {secondaryUiThreadId}.";
throw new Exception(msg, ex);
}
, null);
// NOTE - Application execution will only continue from this point
// onwards if the exception was handled on the main UI thread
// by Application.DispatcherUnhandledException
}
}
// THIS METHOD RUNS ON A SECONDARY UI THREAD (THREAD WITH A DISPATCHER)
private void MethodRunningOnSecondaryUIThread()
{
var secondaryUiThreadId = Thread.CurrentThread.ManagedThreadId;
try
{
// On secondary thread, show a new Window before starting a new Dispatcher
// ie turn secondary thread into a UI thread
var window = new SecondaryUIThreadWindow();
window.Show();
Dispatcher.Run();
}
catch (Exception ex)
{
// Dispatch the exception back to the main ui thread and reraise it
Application.Current.Dispatcher.Invoke(
DispatcherPriority.Send,
(DispatcherOperationCallback) delegate
{
// THIS CODE RUNS BACK ON THE MAIN UI THREAD
string msg = $"Exception forwarded from secondary UI thread {secondaryUiThreadId}.";
throw new Exception(msg, ex);
}
, null);
// NOTE - Application execution will only continue from this point
// onwards if the exception was handled on the main UI thread
// by Application.DispatcherUnhandledException
}
}
