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lang: ja-jp
breaks: true
---
# WPF 処理状況ダイヤログを表示して重たい処理を Task で実行する。 2021-05-26


## ProgressDialog.xaml

<Window
    ・・・
    xmlns:metro="http://metro.mahapps.com/winfx/xaml/controls"
    xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
    ・・・
    />
    <Grid
        Margin="0,0,0,10">
        <metro:ProgressRing />
        <Button
            
            Width="100"
            Style="{DynamicResource MaterialDesignRaisedButton}"
            materialDesign:ShadowAssist.ShadowDepth="Depth2"
            Content="キャンセル"
            VerticalAlignment="Bottom"
            Click="Button_Click"
            />

    </Grid>
</Window>

## ProgressDialog.xaml.cs

        bool m_doCancel = false;

        public ProgressDialog()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            m_doCancel = true;
        }

        public bool DoCancel
        {
            get { return this.m_doCancel; }
        }

## MainWindow.xaml

<metro:MetroWindow 
    ・・・
    xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
    ・・・
    />
    <Grid>

        <StackPanel
            Orientation="Vertical">
        </StackPanel>

        <Button
            Width="300"
            Style="{DynamicResource MaterialDesignRaisedButton}"
            materialDesign:ShadowAssist.ShadowDepth="Depth2"
            Content="処理実行"
            Click="Button_Click"
            VerticalAlignment="Center" />

    </Grid>
</metro:MetroWindow>

## MainWindow.xaml.cs

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            ProgressDialog progress = new ProgressDialog();
            progress.Owner = this;
            progress.WindowStartupLocation = WindowStartupLocation.CenterOwner;

            Task tsk = new Task(() => DoWork(progress));
            tsk.Start();

            progress.ShowDialog();
        }

        private void DoWork(ProgressDialog progress)
        {
            // 重たい処理
            while (progress.DoCancel == false)
            {
                Thread.Sleep(10);
            }
            progress.Dispatcher.Invoke(() => progress.Close());
        }

###### tags: `WPF` `ProgressRing` `MahApps.Metro.Controls` `MahApps.Metro`