.net IAsyncResult 非同步作業

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<br>        //定義一個委託         public delegate int DoSomething(int count);           //BeginInvoke 的回呼函數         private static void Execute(IAsyncResult async)         {             DoSomething temp = (DoSomething)async.AsyncState;             int sum = temp.EndInvoke(async);             Console.WriteLine("線程結束：值為" + sum);         }                  /// <summary>         /// 判斷輸入的整數是不是素數         /// </summary>         /// <param name="candidate">輸入的整數</param>         /// <returns>為素數返回true,否則返回false</returns>         public static bool IsPrime(int candidate)         {             bool retVal = true;             //使用遞增方式會更有效率，             //但是在示範取消功能時，使用遞減的數字會更好。             //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);             //這裡還有100行代碼                     Console.WriteLine("訊息擷取成功");                  Console.ReadLine();         }