WPF工具包BusyIndi​​cator

Question

我在尝试更新UI时遇到问题。 我需要的是在显示BusyIndicator ，需要更改消息，并且在5秒钟完成后，显示另一条消息2秒钟，然后隐藏BusyIndicator 。 谢谢！

XAML

<xctk:BusyIndicator IsBusy="{Binding IsBusy}" DisplayAfter="0">
    <xctk:BusyIndicator.BusyContentTemplate>
        <DataTemplate>
            <StackPanel>
                <mahApps:ProgressRing IsActive="{Binding IsBusy}"/>
                <Label Content="{Binding ShowMessage}"/>
            </StackPanel>
        </DataTemplate>
    </xctk:BusyIndicator.BusyContentTemplate>

    ...

</xctk:BusyIndicator>

XAML ViewModel

public string ShowMessage
{
    get { return _showMessage; }
    set
    {
        _showMessage = value;
        RaisePropertyChanged("ShowMessage");
    }
}

private void Save()
{
    ShowMessage = "Wait please...";

    Task.Factory.StartNew(() =>
    {
        IsBusy = true; // Show busyindicator and ProgressRing

        Thread.Sleep(5000); // 5 seconds to see the animation (Here is a SQL insert)

        /// Hide ProgressRing only

        ShowMessage = "Save complete.";

        Thread.Sleep(2000); // 2 seconds to see "ShowMessage"

    }).ContinueWith(x =>
    {
        IsBusy = false; // hide busyindicator and ProgressRing

        ...

    }, TaskScheduler.FromCurrentSynchronizationContext());
}

Answer 1

有点晚了，但是ShowMessage =“保存完成。”; 不在UI线程上运行。 为了使RaisePropertyChanged正常工作，因此您需要插入另一个Continuation and Task以使用FromCurrentSynchronizationContext执行ShowMessage。