WPF 精修篇 长时间线程加取消功能
2024-08-30 07:13:07
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<Grid>
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<Grid.RowDefinitions>
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<RowDefinition Height="11*"/>
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<RowDefinition Height="29*"/>
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</Grid.RowDefinitions>
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<StackPanel Orientation="Horizontal" Margin="0" VerticalAlignment="Center">
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<Label>开始数据</Label>
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<TextBox x:Name="beginText" HorizontalAlignment="Left" Height="31" TextWrapping="Wrap" Text="100" VerticalAlignment="Top" Width="100"/>
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<Label>结束数据</Label>
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<TextBox x:Name="endText" HorizontalAlignment="Left" Height="31" TextWrapping="Wrap" Text="1000000000" VerticalAlignment="Top" Width="100"/>
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<Button x:Name="button" Content="开始" HorizontalAlignment="Center" VerticalAlignment="Center" Width="75" Click="Button_Click"/>
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<Button x:Name="Cancel" Content="取消" HorizontalAlignment="Center" VerticalAlignment="Center" Width="75" Click="Cancel_Click"/>
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</StackPanel>
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<StackPanel Margin="0" Grid.Row="1">
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<TextBlock x:Name="odd" TextWrapping="Wrap" Text="奇数数量："/>
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<TextBlock x:Name="even" TextWrapping="Wrap" Text="偶数数量："/>
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</StackPanel>
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</Grid>
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private int oddcount =0;
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private int evencount =0;
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public void Make(int from ,int to)
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{
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for (int i = from; i < to; i++)
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{
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if (TokenSource.IsCancellationRequested)
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{
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evencount = -1;
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oddcount = -1;
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return;
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}
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if (i % 2 == 0)
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{
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evencount++;
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}
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else
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{
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oddcount++;
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}
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}
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}
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private void Button_Click(object sender, RoutedEventArgs e)
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{
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int from=0;
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int to = 0;
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if(int.TryParse(beginText.Text,out from)&&int.TryParse(endText.Text,out to) )
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{
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button.IsEnabled = false;
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ThreadPool.QueueUserWorkItem(_ =>
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{
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TokenSource = new CancellationTokenSource();
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Make(from, to);
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Dispatcher.BeginInvoke(new Action(() =>
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{
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if (oddcount < 0 || evencount < 0)
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{
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odd.Text = "操作取消";
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even.Text = "操作取消";
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}
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else
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{
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odd.Text = "奇数数量：" + oddcount;
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even.Text = "偶数数量：" + evencount;
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}
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button.IsEnabled = true;
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}));
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});
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}
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}
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public CancellationTokenSource TokenSource = null;
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private void Cancel_Click(object sender, RoutedEventArgs e)
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{
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if (TokenSource != null)
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{
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TokenSource.Cancel();
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TokenSource = null;
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}
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}
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