.Net中的异步Web请求是否有助于提高性能

Question

C＃.net中的常规请求与异步请求之间的性能差异（如果有）是什么？

Answer 1

Depends on your use case. While there is no immediate performance benefit from using async in simple scenarios, it can be crucial in more complex ones, and for scalability.

For instance, sending multiple requests to many servers is obviously best done in parallel, this can be handled using async.

Regarding scalability, consider a web application that uses sync web requests to communicate with slow external servers. Since IIS only allocates a limited amount of threads to serve requests from users, when the number of users grow, there is a risk that all user threads will be blocked while waiting for the external web requests. This means that some user requests will be rejected by IIS.

Answer 2

It depends, in asp.net you must use synchronous (until 4.5); but in a Windows Form or any other type of C# project though, it prevents the thread from being on hold. Calling the ASYNC complete event, would allow you to update the proper information without putting the UI or the Main thread on hold.

Answer 3

在异步模式下，服务器只能回复您想要的内容，这将最大程度地减少网络流量，然后最小化响应时间，改善用户体验。