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private static Task<WebResponse> GetResponseAsync(WebRequest request)
{
    return Task.Run<WebResponse>(() =>
        {
            AutoResetEvent autoResetEvent = new AutoResetEvent(false);

            // BeginGetResponse で autoResetEvent を発火させる
            IAsyncResult asyncResult = request.BeginGetResponse(r => autoResetEvent.Set(), null);

            // autoResetEvent.Set() の発火を待つ。すなわちここでブロックする

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public static IList<参加者> Create()
{
    // …前略
    }).ToList();

    int count = list.Count;
    var rnd = new Random();
    for (int i = 0; i < count; i++)
    {
        int src = rnd.Next(0, count);

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private async void Button_Click_2(object sender, RoutedEventArgs e)
{
    _isContinue = false;
    while (!_isBreaking)
        await Task.Delay(50);

    itemListView.Background = new SolidColorBrush(Colors.DarkGray);


    int remain = 5000;

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private void Button_Click_1(object sender, RoutedEventArgs e)
{
    itemListView.Background = backButton.Background;
    Rotate();
}


private bool _isContinue;
private bool _isBreaking;

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public SampleDataSource()
{
    String ITEM_CONTENT = String.Format("Item Content: {0}\n\n{0}\n\n{0}\n\n{0}\n\n{0}\n\n{0}\n\n{0}",
                "Curabitur class …中略…");

    var group1 = new SampleDataGroup("Group-1",
            "Group Title: 1",
            "Group Subtitle: 1",
            "Assets/DarkGray.png",
            "Group Description: Lorem ipsum …中略… ante a ante");

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private  void NextButton_Click_1(object sender, RoutedEventArgs e)
{
    itemListView.Background = backButton.Background;

    var selected = itemListView.SelectedItem as Kujian.Data.SampleDataItem;

    var dataGroup = itemListView.DataContext as Kujian.Data.SampleDataGroup;
    dataGroup.Items.Remove(selected);
}

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public SampleDataSource()
{
    String ITEM_CONTENT = String.Format("Item Content: {0}\n\n{0}\n\n{0}\n\n{0}\n\n{0}\n\n{0}\n\n{0}",
                "Curabitur class …中略…");

    var group1 = new SampleDataGroup("Group-1",
            "くじ庵", //"Group Title: 1",
            "Group Subtitle: 1",
            "Assets/DarkGray.png",
            "Group Description: Lorem ipsum …中略… ante a ante");

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<Grid Grid.Column="1" x:Name="ControlGrid"  >
    <Grid.ColumnDefinitions>
        <ColumnDefinition />
        <ColumnDefinition />
        <ColumnDefinition />
    </Grid.ColumnDefinitions>
            
    <Button x:Name="StartButton" Content="START" Click="Button_Click_1"  />
    <Button x:Name="StopButton" Content="STOP" Click="Button_Click_2" Grid.Column="1"  />
    <Button x:Name="NextButton" Content="Next" Click="NextButton_Click_1" Grid.Column="2"  />

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<DataTemplate x:Key="DataTemplate1">
    <Grid Height="Auto" Margin="6" Opacity="{Binding DataContext.Content, RelativeSource={RelativeSource Mode=Self}}"  >
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Border Background="{StaticResource ListViewItemPlaceholderBackgroundThemeBrush}" Width="110" Height="110" 
            VerticalAlignment="Center"  >
            <Image Source="{Binding Image}" Stretch="UniformToFill"/>
        </Border>

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public class 参加者
{
    private const string OriginalData = @"…略(約40人分)…";

    public string Name { get; set; }
    public string ImageUrl { get; set; }

    public static IList<参加者> Create()
    {
        XName img = XName.Get("img");