WPF finishing piece for a long time threads, plus cancel function

Original: WPF finishing piece for a long time threads, plus cancel function

  
  
<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;
}

}