CODEWITHSUNDEEP
c#wpfasynchronousmvvmtask
user1058637
user1058637

Reputation: 151

Check completion of async task from a different thread

I'm using async tasks to upload files and update the database. I need to know when the application is closed to update the upload status in the DB.

My task is in a ViewModel class.

private async void OnUpload(object param)
{
    await Task.Factory.StartNew(() =>
    {
        try
        {
            ...
        }
        catch (Exception ex)
        {
            ...
        }
    }
}

What should I put in my MainWindow OnClosing Event?

protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
{
    ....

    base.OnClosing(e);
}

Upvotes: 3

Views: 272

Answers (2)

Contango
Contango

Reputation: 80272

Personally, I'd publish an event from the OnClosing using Reactive Extensions (RX) and a Subject.

Everywhere in the program that I need it, I'd subscribe to the event and perform any cleanup.

This would decouple the OnClosing event from all of the subscribers that do the cleanup, and would let you place the cleanup code for the database and the heavy lifting code for the database close to each other.

Upvotes: 1

Nitin Joshi
Nitin Joshi

Reputation: 1668

Take a bool variable IsTaskCompleted in your class and keep default value to false. As a last statement in the try block of your task, set IsTaskCompleted to true.

Check this variable in the closing event handler, if value is false that means task isn't got completed.

Upvotes: 1

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