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c#-正确显示BusyIndicator

2019-11-19 04:07:34 作者：互联网

我有一个WPF C#应用程序.

我正在使用Xceeed.wpf工具包

用伪代码,我的函数将：

>显示忙碌指示器
>对我的服务器进行了REST API调用
> BusyIndicator停止显示

实际发生的是,直到REST API调用完成后,才显示BusyIndicator.有时确实会显示出来,但“标志性”影响并不是一帆风顺的.

我尝试了几种方法,这是我最近的尝试：

// raise event to invoke method call on main UI page
// event raised here

Task.Run(() =>
{
    // makes API call
    busyIndicator.IsBusy = false;

);

public void ShowBusy()
{
    this.InvokeOnMainThread(() =>
    {
        busyIndicator.IsBusy = true;
    });
}

public static void InvokeOnMainThread(this Control control, Action method)
{
    if (!control.Dispatcher.CheckAccess())
    {            Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Normal, method);
        return;
    }
    method();
}

标记：

    <xctk:BusyIndicator Name="busyIndicator" Grid.Column="1" Grid.Row="1" IsBusy="True" DisplayAfter="0" Background="White" BorderBrush="White">
        <xctk:BusyIndicator.BusyContentTemplate  >
            <DataTemplate>
                <StackPanel Height="50">
                    <TextBlock HorizontalAlignment="Center">Please wait...</TextBlock>
                    <WPFSpark:FluidProgressBar  Oscillate="True" Width="400"   Foreground="DarkGreen" BorderBrush="White" Opacity="1" />
                </StackPanel>                 
            </DataTemplate>
        </xctk:BusyIndicator.BusyContentTemplate>
        <xctk:BusyIndicator.OverlayStyle>
            <Style TargetType="Rectangle">
                <Setter Property="Fill" Value="White"/>                    
            </Style>
        </xctk:BusyIndicator.OverlayStyle>
        <xctk:BusyIndicator.ProgressBarStyle>
            <Style TargetType="ProgressBar">
                <Setter Property="BorderBrush" Value="white"></Setter>
                <Setter Property="Visibility" Value="Collapsed"/>
            </Style>
        </xctk:BusyIndicator.ProgressBarStyle>
        <xctk:BusyIndicator.Content>
               //my usercontrol which invokes the call
        </xctk:BusyIndicator.Content>
</xctk:BusyIndicator>

解决方法:

您必须等到任务完成后才能关闭BusyIndicator.目前,您只是启动任务并将忙碌指示灯设置为熄灭.

将您的方法标记为异步并等待API调用.

busyIndicator.IsBusy = true;
await Task.Run(() =>
{
    //makes api call
);
busyIndicator.IsBusy = false;

如果由于某种原因,您不能使用async / await,那么请使用延续.

  Task.Run(() =>
  {
      //makes api call
  }).ContinueWith(antecedent =>
  {
      busyIndicator.IsBusy = false;
  }, TaskScheduler.FromCurrentSynchronizationContext());

标签：xceed,wpf,c
来源： https://codeday.me/bug/20191119/2033123.html

c#-正确显示BusyIndi​​cator

c#-正确显示BusyIndicator