Wait for ActivateItem close?

[michasacuer]

I have a question. I have button where i launch ActivateItem:

    public void LoadTaskManagerPage()
    {
        this.ActivateItem(new TaskManagerViewModel(this.LoggedUser, this.repository));

        if (this.LoggedUser.GetUserTask() != null)
        {
            this.IsActiveTaskButtonVisible = Visibility.Visible;
            this.NotifyOfPropertyChange(() => this.IsActiveTaskButtonVisible);
        }
    }

Is it possible to hang an app and go to if statement only, if ActivateItem ends?

How to wait for end of ActivateItem in Caliburn.Micro?

I tried something like:

    public void LoadTaskManagerPage()
    {
        var taskManagerTask = Task.Run(() => this.ActivateItem(new TaskManagerViewModel(this.LoggedUser, this.repository)));
        taskManagerTask.Wait();

        if (!this.LoggedUser.GetUserTask().IsTaskTakenByUser())
        {
            this.IsActiveTaskButtonVisible = Visibility.Visible;
            this.NotifyOfPropertyChange(() => this.IsActiveTaskButtonVisible);
        }
    }

With Tasks, but when i click on LoadTaskManagerPage() it wont show any window, application hangs forever

[nigel-sampson]

You will "soon" with the 4.0.0 builds which make ActivateItem into ActivateItemAsync that you can await.

It's still in development, but the in progress packages are available from MyGet (link in the readme.md).

[michasacuer]

@nigel-sampson Thansk for your advice. But after changing my code to:

public void LoadTaskManagerPage()
{
    this.ActivateItemAsync(new TaskManagerViewModel(this.LoggedUser, this.repository));

    if (this.LoggedUser.GetUserTask() != null)
    {
        this.IsActiveTaskButtonVisible = Visibility.Visible;
        this.NotifyOfPropertyChange(() => this.IsActiveTaskButtonVisible);
    }
}

Its still hitting if before ActivateItem close (im using TryCloseAsync() for closing Screen. Have you any advice, how to achive what i want to? (activate if statement only, if activeItem close. Thanks for suggestions

[nigel-sampson]

ActivateItemAsync is asynchronous which means it needs to be awaited. I'd suggest reading up on The Task asynchronous programming model in C#.