.net IAsyncResult 异步操作

浏览数：22 / 时间：2015年06月09日

<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();
        }