task code

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using System; using System.Collections.Generic; using System.Threading; using System.Threading.Tasks;   public class Example {     public static void Main()     {         var qTasks = new List<Task<string>>();         var paralist = new List<int> { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };         foreach (var para in paralist)         {             //StartNew 只接受输入参数是object类型的Func             var fun = new Func<object, string>(                 (pa) =>                 {                     //pa 是Func的定义参数                     Console.WriteLine("para is {0}", pa);                     //Thread.Sleep(new Random().Next(500, 3000));                     int ipa = Convert.ToInt32(pa);                     int result = ipa * 5;                     return result.ToString();                 }                 );               var task = Task.Factory.StartNew(fun, para); //para是传入参数             qTasks.Add(task);             Console.WriteLine(" task id is {0}", task.Id);         }           Task.WaitAll(qTasks.ToArray());  //等待所有线程执行完毕           //收集所有task返回的数据         foreach (var task in qTasks)         {             if (task.Result != null)             {                 Console.WriteLine("task id : {0} , result : {1} ", task.Id, task.Result);             }         }           Console.ReadKey();     } }

　　

有时候会需要用到ManualResetEvent来等待其他线程是否执行完毕，用法如下:

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using System; using System.Collections.Generic; using System.Threading; using System.Threading.Tasks;   public class Example {     static ManualResetEvent manualEvent = new ManualResetEvent(false);       public static void Main()     {         manualEvent.Reset(); //等同于将initialState设置为false           Console.WriteLine("In main ..");         LongTimeFunc();           manualEvent.WaitOne(10000);           Console.WriteLine("wait thread finish...");           Console.ReadKey();     }         private static void LongTimeFunc()     {         //Thread 多数时候可以使用Task代替，此刻thread设置为STA，所以这么用         Thread thread = new Thread(new ParameterizedThreadStart(ExecuteFunc));         thread.SetApartmentState(ApartmentState.STA);         thread.IsBackground = true;         thread.Start("real parameters");    //ExecuteFunc 函数从此处传入参数     }       private static void ExecuteFunc(object obj)     {         //long time operation         Thread.Sleep(2000);         Console.WriteLine(obj.ToString());         manualEvent.Set();     } }