/// <summary>
/// <para>Observe on UIDispatcherScheduler.</para>
/// <para>UIDIspatcherScheduler is created when access to UIDispatcher.Default first in the whole application.</para>
/// <para>If you want to explicitly initialize, call UIDispatcherScheduler.Initialize() in App.xaml.cs.</para>
/// If a new value arrives before the selector is finished calculated the old one then it is canceled.
///
/// This will also raise a message box if an exception is thrown downstream.
/// </summary>
public static IObservableExceptional <U> ObserveOnSolidworksThread <T, U>(this IObservableExceptional <T> source, Func <T, CancellationToken, U> selector)
{
return(source
.StartWith(default(T))
.Select(s => new { s, cts = new CancellationTokenSource() })
.Buffer(2, 1).Where(b => b.Count == 2)
.Select
(b =>
{
b[0].cts.Cancel();
return b[1];
})
.ObserveOn(UiDispatcherScheduler.Default)
.Select(b => selector(b.s, b.cts.Token)));
}
public static IObservableExceptional <Task> ObserveOnSolidworksThread <T>(this IObservableExceptional <T> source, Func <T, CancellationToken, Task> selector)
{
return(source
.StartWith(default(T))
.Select(s => new { s, cts = new CancellationTokenSource() })
.Buffer(2, 1).Where(b => b.Count == 2)
.Select(b =>
{
b[0].cts.Cancel();
return b[1];
})
.ObserveOn(UiDispatcherScheduler.Default)
.Select(async b =>
{
try
{
await selector(b.s, b.cts.Token);
}
catch (OperationCanceledException)
{
Console.WriteLine("Operation cancelled");
}
}));
}