c#异步线程：同步调用，异步调用，异步回调

定义一个异步线程类：

  public class AsyEventClass
    {
        private static ILog logger = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
        //异步线程，委托
        public delegate string AsyncEventHandler(long num1, long num2);
        public string ToDealData(long num1, long num2)
        {
            logger.Error("异步处理数据开始：num1:" + mainDigitalId + ",num2:");
             //处理数据或其他操作return "异步成功，num1:" + mainDigitalId + ",num2:" + bindDigitalId;
        }

        public void Callback(IAsyncResult result)
        {
            AsyncEventHandler handler = (AsyncEventHandler)((AsyncResult)result).AsyncDelegate;
            logger.Error(handler.EndInvoke(result));
        }
    }

第一 同步调用

public class Program
{
        static void Main()
        {
           Console.WriteLine("===== 同步调用，阻塞当前线程  =====");
             AsyEventClass ac = new AsyEventClass();
             AsyEventClass.AsyncEventHandler asy = new AsyEventClass.AsyncEventHandler(ac.ToDealData);
            string result =  asy.Invoke(num1,num2);
            Console.WriteLine("此处会等上一步执行完再执行");
            Console.WriteLine(result);
        }
        
}

第二  异步调用

public class Program
{
        static void Main()
        {
           Console.WriteLine("=====异步调用，不会阻塞 ，但EndInvoke会因等待结果而阻塞====");
             AsyEventClass ac = new AsyEventClass();
             AsyEventClass.AsyncEventHandler asy = new AsyEventClass.AsyncEventHandler(ac.ToDealData);
            IAsyncResult result  =  asy.BeginInvoke(num1,num2,null,null);
            Console.WriteLine("此处不受影响，继续执行");
            Console.WriteLine(asy.EndInvoke(result));// 如果异步处理时间过长，此处会阻塞线程，知道等到结果
        }
        
}

第三  异步回调

public class Program
{
        static void Main()
        {
           Console.WriteLine("=====异步回调，不会阻塞，自动回调 ====");
             AsyEventClass ac = new AsyEventClass();
             AsyEventClass.AsyncEventHandler asy = new AsyEventClass.AsyncEventHandler(ac.ToDealData);
             IAsyncResult result=asy.BeginInvoke(num1, num2, new AsyncCallback(ac.Callback), asy);//处理完自动回调callback方法，不会造成线程阻塞
            Console.WriteLine("此处不受影响，继续执行");
        }
        
}