. NET IAsyncResult Asynchronous operations

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<br>        //定义一个委托         public delegate int DoSomething(int count);         //BeginInvoke 的回调函数         private static void Execute(IAsyncResult async)         {             DoSomething temp = (DoSomething)async.AsyncState;             int sum = temp.EndInvoke(async);             Console.WriteLine("线程结束：值为" + sum);         }           /// <summary>         /// 判断输入的整数是不是素数         /// </summary>         /// <param name="candidate">输入的整数</param>         /// <returns>为素数返回true,否则返回false</returns>         public static bool IsPrime(int candidate)         {             bool retVal = true;             //使用递增方式会更有效率，             //但是在演示取消功能时，使用递减的数字会更好。             //for (int i = 2; i < candidate / 2; i++)             for (int i = candidate / 2 + 1; i > 1; i--)             {                 if (candidate % i == 0)                 {                     retVal = false;                     break;                 }             }             return retVal;         }          private static int maseggs(int count)         {             int result = 0;             for (int index = 0; index < count; index++)             {                 if (IsPrime(index + 1))                 {                     result++;                 }             }             return result;         }      static void Main(string[] args)         {             DoSomething hidands = new DoSomething(maseggs);             IAsyncResult async = hidands.BeginInvoke(100000, new AsyncCallback(Execute), hidands);             //这里还有100行代码                     Console.WriteLine("消息获取成功");              Console.ReadLine();         }