WPF工具包BusyIndicator

Question

我在试图更新UI时遇到了问题。我需要的是，在显示BusyIndicator之后，需要更改消息，完成5秒后，再显示另一条消息2秒，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 = "Save“；没有在UI线程上运行。为了使RaisePropertyChanged工作，它必须工作，因此您需要插入另一个延续和任务来使用ShowMessage执行FromCurrentSynchronizationContext。