Question

我在WPF中使用向导组件。单击向导的Finish按钮时，我会执行一些文件操作，大约需要5秒钟。

我想在文件操作期间显示进度条。

所以，我做了：

Thread t = new Thread(new ThreadStart(() =>
{
     MessageWithProgressBar progress = new MessageWithProgressBar(this);
     progress.Show();
}));
t.SetApartmentState(ApartmentState.STA);
t.Start();

来自MessageWithProgressBar.xaml的一些代码

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="60"/>
        <RowDefinition Height="60"/>
    </Grid.RowDefinitions>
    <Grid Grid.Row="0">
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Label Name="title" Content="Please wait while processing.." FontSize="17.333"/>
    </Grid>
    <Grid Grid.Row="1" Margin="0,0,0,20">
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <ProgressBar Name="progress" IsIndeterminate="True" Value="{Binding CurrentStep, Converter={StaticResource stepToProgress}}" />
        <TextBlock Name="progressLabel" Text="{Binding ElementName=progress, Path=Value, StringFormat={}{0:0}%}" HorizontalAlignment="Center" VerticalAlignment="Center" />
    </Grid>
</Grid>

来自MessageWithProgressBar.xaml.cs的一些代码

public partial class MessageWithProgressBar : Window
{
    public MessageWithProgressBar(MainWindow Mw)
    {
        InitializeComponent();
        this.DataContext = Mw;
    }
}

public class currentStepToProgressValue : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value is int)
        {
            if ((int)value <= GeneralProperties.General.thresholdStep)
                return (int)Math.Floor((decimal)(8 * (int)value));
        }
        return 0;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

我的问题是进度条立即消失，我看不到进度条。

有什么建议吗？

进度条在文件操作wpf期间作为线程

0 个答案: