WPF 精修篇 BackgroundWorker

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效果

   




        




            "22*"/>




            "11*"/>




            "47*"/>




        



        "Horizontal" Margin="0,28" VerticalAlignment="Center">




            开始数据




            "beginText" HorizontalAlignment="Left" Height="31" TextWrapping="Wrap" Text="100" VerticalAlignment="Top" Width="100"/>




            结束数据




            "endText" HorizontalAlignment="Left" Height="31" TextWrapping="Wrap" Text="1000000000" VerticalAlignment="Top" Width="100"/>




            "button" Content="开始" HorizontalAlignment="Center" VerticalAlignment="Center" Width="75" Click="Button_Click"/>




            "Cancel" Content="取消" HorizontalAlignment="Center" VerticalAlignment="Center" Width="75" Click="Cancel_Click"/>




        



        "0" Grid.Row="1" Grid.RowSpan="2">




            "odd" TextWrapping="Wrap"  Text="奇数数量："/>




            "even" TextWrapping="Wrap" Text="偶数数量："/>




            "Prebar" Height="20"/>




        



    

      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 


            {



                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 Tupleint, 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 = ( Tupleint, 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();



        }



 
WPF 精修篇 BackgroundWorker
标签：imp   title   label   cal   keyword   ndt   登录   ble   run   
原文地址：https://www.cnblogs.com/lonelyxmas/p/12075538.html