WPF 精修篇 长时间线程加取消功能

原文:WPF 精修篇 长时间线程加取消功能

<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="11*"/>
<RowDefinition Height="29*"/>
</Grid.RowDefinitions>
<StackPanel Orientation="Horizontal" Margin="0" VerticalAlignment="Center">
<Label>开始数据</Label>
<TextBox x:Name="beginText" HorizontalAlignment="Left" Height="31" TextWrapping="Wrap" Text="100" VerticalAlignment="Top" Width="100"/>
<Label>结束数据</Label>
<TextBox x:Name="endText" HorizontalAlignment="Left" Height="31" TextWrapping="Wrap" Text="1000000000" VerticalAlignment="Top" Width="100"/>
<Button x:Name="button" Content="开始" HorizontalAlignment="Center" VerticalAlignment="Center" Width="75" Click="Button_Click"/>
<Button x:Name="Cancel" Content="取消" HorizontalAlignment="Center" VerticalAlignment="Center" Width="75" Click="Cancel_Click"/>
</StackPanel>
<StackPanel Margin="0" Grid.Row="1">
<TextBlock x:Name="odd" TextWrapping="Wrap"  Text="奇数数量："/>
<TextBlock x:Name="even" TextWrapping="Wrap" Text="偶数数量："/>
</StackPanel>
</Grid>

private int oddcount =0;
private int evencount =0;
public void Make(int from ,int to) 
{
for (int i = from; i < to; i++)
{
if (TokenSource.IsCancellationRequested) 
{
evencount = -1;
oddcount = -1;
return;
}
if (i % 2 == 0)
{
evencount++;
}
else 
{
oddcount++;
}
}
}
private void Button_Click(object sender, RoutedEventArgs e)
{
int from=0;
int to = 0;
if(int.TryParse(beginText.Text,out from)&&int.TryParse(endText.Text,out to) )
{
button.IsEnabled = false;
ThreadPool.QueueUserWorkItem(_ =>
{
TokenSource = new CancellationTokenSource();
Make(from, to);

Dispatcher.BeginInvoke(new Action(() =>
{
if (oddcount < 0 || evencount < 0)
{
odd.Text = "操作取消";
even.Text = "操作取消";
}
else
{
odd.Text = "奇数数量：" + oddcount;
even.Text = "偶数数量：" + evencount;
}
button.IsEnabled = true;
}));

});

}

}

public CancellationTokenSource TokenSource = null;
private void Cancel_Click(object sender, RoutedEventArgs e)
{
if (TokenSource != null) 
{
TokenSource.Cancel();
TokenSource = null;
}

}

原文地址：https://www.cnblogs.com/lonelyxmas/p/12075537.html