WPF BackgroundWorker finishing papers

Original: WPF BackgroundWorker finishing papers

effect

 

  
  
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height= "22*"/>
<RowDefinition Height= "11*"/>
<RowDefinition Height= "47*"/>
</Grid.RowDefinitions>
<StackPanel Orientation= "Horizontal" Margin= "0,28" 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" Grid.RowSpan= "2">
<TextBlock x:Name= "odd" TextWrapping= "Wrap" Text= "奇数数量："/>
<TextBlock x:Name= "even" TextWrapping= "Wrap" Text= "偶数数量："/>
<ProgressBar x:Name= "Prebar" Height= "20"/>
</StackPanel>
</Grid>
 
 

  
  
private int oddcount = 0;
private int evencount = 0;
public void Make(int from ,int to)
{
oddcount = 0;
evencount = 0;
int num = (to - from) / 100;
for ( int i = from; i < to; i++)
{
if (worker.CancellationPending == true)
{
return;
}

if (i % 2 == 0)
{
evencount++;
}
else
{
oddcount++;
}
if (i % num == 0 && (worker != null) && (worker.WorkerReportsProgress = true))
{
worker.ReportProgress(i / num);
}
}

}
BackgroundWorker worker = null;
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;
odd.Text = "奇数数量：0" ;
even.Text = "偶数数量：0" ;

worker = new BackgroundWorker();
//异步取消 需要增加这个 不然取消失效
worker.WorkerSupportsCancellation = true;
//支持报告进度
worker.WorkerReportsProgress = true;
//注册滚动条事件
worker.ProgressChanged+=worker_ProgressChanged;

//注册任务
worker.DoWork+=worker_DoWork;
//任务完毕触发
worker.RunWorkerCompleted += worker_RunWorkerCompleted;
//给任务传参
worker.RunWorkerAsync( new Tuple< int, int>( from, to));

}

}

private void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
Prebar.Value = e.ProgressPercentage;
}

void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
// throw new NotImplementedException();
if (sender is BackgroundWorker)
{

if (e.Cancelled == true)
{
odd.Text = "任务已取消";
even.Text = "";
}
else
{
odd.Text = "奇数数量：" + oddcount;
even.Text = "偶数数量：" + evencount;
}
BackgroundWorker k = (BackgroundWorker)sender;
k.DoWork -= worker_DoWork;
k.RunWorkerCompleted -= worker_RunWorkerCompleted;
k = null;
button.IsEnabled = true;
}

}

private void worker_DoWork(object sender, DoWorkEventArgs e)
{
var args = ( Tuple< int, int>)e.Argument;
Make(args.Item1, args.Item2);
if (worker.CancellationPending == true)
{
e.Cancel = true;
}
}


private void Cancel_Click(object sender, RoutedEventArgs e)
{

worker.CancelAsync();
}