c# - Implementing a web service callback

Question

I have a winforms C# desktop application. I have a polling web service to my server to retrieve messages as and when they come in. Is there a way of implementing a callback web service from my desktop to the server instead of polling the web service? Is this what asynchronous web services are about?

Thanks

Answer 1

有几种方法可以实现这一点：一方面，您可以用很长的超时时间向服务器发起请求。让服务器等待一条新消息（并在服务器端断言请求不会超时），一旦有消息就返回请求。如果请求超时，则发出一个新请求。
在 WCF 中，还有一些其他技术，例如Duplex Services 来解决这个问题。