Question

我有一个C＃WPF桌面应用程序。

我想做'某些'工作'，当我这样做时，我想在等待完成时显示进度条/信息。

所以，为了模仿这个，我有这个UI：

<Window xmlns:mui="http://firstfloorsoftware.com/ModernUI"  x:Class="WpfApplication3.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApplication3"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid HorizontalAlignment="Center" VerticalAlignment="Center">
        <StackPanel x:Name="frm" Orientation="Horizontal" >
            <Button Click="Button_Click" Content="Press Me!" />
            <Label Content="this is my test stuff"></Label>
        </StackPanel>
        <TextBox Text="Hello Andy" x:Name="prog" Visibility="Collapsed"></TextBox>
    </Grid>
</Window>

我的守则背后：

public MainWindow()
{
    InitializeComponent();
}

private void ShowBusy()
{
    Application.Current.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal,
        new Action(() =>
        {
            frm.Visibility = Visibility.Collapsed;
            prog.Visibility = Visibility.Visible;
        }));
}

private void HideBusy()
{


    Application.Current.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Send,
        new Action(() =>
        {
            frm.Visibility = System.Windows.Visibility.Visible;
            prog.Visibility = System.Windows.Visibility.Collapsed;
        }));
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    System.Threading.Thread th = new System.Threading.Thread(ShowBusy);
    th.Start();

    while (true)
    {
        System.Threading.Thread.Sleep(100);
    }

    HideBusy();
}

当我运行时，没有显示'Hello Andy'并且无限循环正在运行..

Answer 1

private void Button_Click(object sender, RoutedEventArgs e)
{
    Thread th = new Thread(DoSomething);
    th.Start();
}

private void DoSomething()
{
    ShowBusy();
    while (true)  // No Exit Clause ???
    {
        System.Threading.Thread.Sleep(100);
    }
    HideBusy();
}

Answer 2

异步任务有IProgress<T>，可让您了解长时间运行方法的进度。

private async void Button_Click(object sender, RoutedEventArgs e)
{
    IProgress<int> progress = new Progress<int>();
    progress.ProgressChanged += progress_ProgressChanged;

    await DoSomething(progress);
}

private void progress_ProgressChanged(object sender, int e)
{
    if(e < 100)
    {
        ShowBusy(e);  //Show busy with progress percentage
    }
    else
    {
        HideBusy();
    }
}

private async Task DoSomething(IProgress<int> progress)
{
    progress.Report(0)
    longMethod1();
    progress.Report(50)
    longMethod2();
    progress.Report(100)
}

如何在“工作”“工作”时显示进度条

2 个答案: