使用异步代理+IAsyncResult 调用函数

这是一个使用异步代理+IAsyncResult 调用函数的例子:

namespace PTTool
{
    class DownloadUpdate
    {
        public static string download(string Kbnumber)
        {
            FileOperation.CopyUpdates(Kbnumber);
            return String.Format("{0} download complete...", Kbnumber);
        }
    }

    public delegate string AsyncMethodCaller(string Kbnumber);
}

namespace PTTool
{
    partial class Program
    {        
        static void Main(string[] args)
        {
 AsyncMethodCaller caller = new AsyncMethodCaller(DownloadUpdate.download);

            string num = Console.ReadLine();
            IAsyncResult result = caller.BeginInvoke(num, null, null);

            while (!result.IsCompleted)
            {
                Thread.Sleep(100);
                Console.Write(".");
            }
            Console.Write(caller.EndInvoke(result));
            result.AsyncWaitHandle.Close();
    }
   }
}