C＃异步IO：有没有确保任务排序的方法？(C# Asynchronous IO: Is there a way of ensuring ordering of tasks?)

 我想使用异步io与分布式哈希服务器进行套接字通信。 环境是C＃3.5，但如果需要可以使用4.0。 
 
 假设我发出以下异步命令（伪代码）： 
 
socket.set_asynch("FOO","bar");
string rc = socket.get_asynch("FOO");
 
 由于异步io使用系统线程池，因此这两个命令可以在两个不同的线程上运行。 我如何确保rc等于“bar”？ 即第一个命令是在第二个命令发布之前发出的？ 
 
 谢谢！ 

I would like to use asynchronous io for socket communication with a distributed hash server. Environment is C# 3.5, but could use 4.0 if necessary.
 
Suppose I issue the following asynchronous commands (in pseudocode):
 
socket.set_asynch("FOO","bar");
string rc = socket.get_asynch("FOO");
 
Since asynchronous io uses the system thread pool, the two commands may be run on two different threads. How can I ensure that rc equals "bar"? i.e. that the first command is issued before the second command is issued?
 
Thanks! 

原文：https://stackoverflow.com/questions/4362158