Question

我正在通过委托进行异步方法调用。指向函数的委托是一个void函数。我怎么知道async函数已成功执行，如果没有再次调用该函数，直到我得到成功响应。这是我的代码 -

BillService bs = new BillService();
PayAdminCommisionDelegate payCom = new PayAdminCommisionDelegate(bs.PaySiteAdminByOrderNo);
payCom.BeginInvoke(OrderNo,null,null);

Answer 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace FewAsyncCalls
{
    class Program
    {
        static void Main(string[] args)
        {
            var d = new Action(LongErrorProneMethod);
            AsyncCallback callback = null;
            callback = new AsyncCallback(r =>
                {
                    try
                    {
                        d.EndInvoke(r);
                    }
                    catch
                    {
                        Console.WriteLine("Async call failed");
                        d.BeginInvoke(callback, null);
                    }
                });
            d.BeginInvoke(callback, null);
            Console.ReadLine();
        }

        private static void LongErrorProneMethod()
        {
            Console.WriteLine("Running long error prone method.");
            Thread.Sleep(1000);
            if (new Random().Next(100) > 10)
                throw new InvalidOperationException();
            else
                Console.WriteLine("Async call successful");
        }
    }
}

如何调用异步方法直到获得成功响应？

1 个答案: