C# 任务、线程、同步（二）

取消架构

1、Parallel.For()方法的取消

  static void CancelParallelLoop()
         {
             var cts = new CancellationTokenSource();
             cts.Token.Register(() => Console.WriteLine("*** token canceled"));
 
             cts.CancelAfter();
 
             try
             {
                 ParallelLoopResult result = Parallel.For(, , new ParallelOptions() { CancellationToken = cts.Token },
                     x => {
                         Console.WriteLine("loop {0} started", x);
                         int sum = ;
                         for (int i = ; i < ; i++)
                         {
                             Thread.Sleep();
                             sum += i;
                         }
                         Console.WriteLine("loop {0} finished", x);
                     });
             }
             catch (Exception ex)
             {
                 Console.WriteLine(ex.Message);
             }
         }

2、任务的取消

  static void CancelTask()
         {
             var cts = new CancellationTokenSource();
             cts.Token.Register(() => Console.WriteLine("*** task cancelled"));
             cts.CancelAfter();
 
             Task t1 = Task.Run(() => {
                 Console.WriteLine("in task ");
                 for (int i = ; i < ; i++)
                 {
                     Thread.Sleep();
                     CancellationToken token = cts.Token;
                     if(token.IsCancellationRequested)
                     {
                         Console.WriteLine("cancelling was requested, cancelling from within the task");
                         token.ThrowIfCancellationRequested();
                         break;
                     }
                     Console.WriteLine("in loop");
                 }
                 Console.WriteLine("task finished without cancellation");
             },cts.Token);
             try
             {
                 t1.Wait();
             }
             catch (AggregateException ex)
             {
                 Console.WriteLine("exception: {0}, {1}", ex.GetType().Name, ex.Message);
                 foreach (var innerException in ex.InnerExceptions)
                 {
                     Console.WriteLine("inner excepion: {0}, {1}", ex.InnerException.GetType().Name, ex.InnerException.Message);
                 }
             }
         }