Contination not trigered

Question

Hi,

I've a problem with a continuation never called :

if i write 

Task.Factory.StartNew(() =>
    {
        this.importedBatchClasses = this.LoadImportedBatchClass();
    })
    .ContinueWith(
            this.HandleFailedTask,
            CancellationToken.None,
            TaskContinuationOptions.OnlyOnFaulted,
            uiSynchronisation)
    .ContinueWith(
        previous => this.RefreshDisplayedProperties(index),
        CancellationToken.None,
        TaskContinuationOptions.None,
        uiSynchronisation)
    .ContinueWith(previous => this.RefreshCompletedEvent.Set())

The RefreshCompletedEvent.Set is never called

But if i write it like this:

Task.Factory.StartNew(() =>
    {
        this.importedBatchClasses = this.LoadImportedBatchClass();
    })
    .ContinueWith(
            this.HandleFailedTask,
            CancellationToken.None,
            TaskContinuationOptions.OnlyOnFaulted,
            uiSynchronisation)
    .ContinueWith(previous => this.RefreshCompletedEvent.Set())
    .ContinueWith(
        previous => this.RefreshDisplayedProperties(index),
        CancellationToken.None,
        TaskContinuationOptions.None,
        uiSynchronisation)

The RefreshCompletedEvent.Set is called.

What's the difference between the twos ?

I need the event to be setted in last 

Thanks for any help

Answer 1

Your first code works for me: the last continuation is called. Could you include short, but complete example code that shows your issue?

Answer 2

Thanks for your help.

The issue occurs when the function is called from an unit test. I think the task is scheduled on the UT's thread which is blocked waiting the event.

So I've change my mind,  and made an another way to not use an event.