网络API异步方法AngularJS [英] Web API async method with AngularJS

问题描述

我是新来使用 AngularJS 与 MVC 5，我一直在考虑使用的Web API 与 AngularJS ，因为它似乎是一个很好的解决方案将数据加载到您的客户端模式。

I'm new to using AngularJS with MVC 5 and I've been looking at using Web API with AngularJS since it seems like a good solution for loading data into your client side models.

不过，我注意到，不少导游使用返回异步操作任务＆LT;型号＆GT; ，我不明白什么好处，这给你比只使用标准的Web API 的操作（例如：<一href="http://monox.mono-software.com/blog/post/Mono/233/Async-upload-using-angular-file-upload-directive-and-net-WebAPI-service/" rel="nofollow">http://monox.mono-software.com/blog/post/Mono/233/Async-upload-using-angular-file-upload-directive-and-net-WebAPI-service/和<一href="http://www.asp.net/web-api/overview/getting-started-with-aspnet-web-api/build-a-single-page-application-%28spa%29-with-aspnet-web-api-and-angularjs" rel="nofollow">http://www.asp.net/web-api/overview/getting-started-with-aspnet-web-api/build-a-single-page-application-%28spa%29-with-aspnet-web-api-and-angularjs).

However I've noticed that quite a few guides use async actions that returns Task<Model> and I don't understand what benefit this gives you over using just standard Web API actions (examples: http://monox.mono-software.com/blog/post/Mono/233/Async-upload-using-angular-file-upload-directive-and-net-WebAPI-service/ and http://www.asp.net/web-api/overview/getting-started-with-aspnet-web-api/build-a-single-page-application-%28spa%29-with-aspnet-web-api-and-angularjs).

由于这些调用的Web API是异步反正我不知道为什么我们需要让这些方法调用异步的。那岂不是更好地只使用标准的Web API调用？

Since these calls to Web API are asynchronous anyway I don't know why we need to make these method calls asynchronous. Wouldn't it be better to use just standard Web API calls?

我不知道，如果计算器是正确的地方，但我所期待的，为什么呼叫做这样一个解释。

I don't know if stackoverflow is the right place for this but I was hoping for an explanation on why calls are done this way.

推荐答案

的的好处异步等待在服务器上的可扩展性和性能。当使用异步（非阻塞）换上同步（阻塞）操作你腾出是previously阻塞等待，你可以用它来同时处理其他请求的线程。

The benefit of async-await on the server is scalability and performance. When you replace synchronous (blocking) operations with asynchronous (non-blocking) ones you free up threads that were previously blocked waiting which you can use to handle other requests concurrently.

异步计谋使您能够以更少的资源做更多的。

async-await enables you to do more with less resources.

让我们假设有这种同步方式：

Let's assume we have this synchronous method:

public void Process()
{
    for (int i = 0; i < 1000; i++)
    {
        Math.Sqrt(i);
    }

    Thread.Sleep(3000); // sync I/O
}

通过使异步：

public async Task ProcessAsync()
{
    for (int i = 0; i < 1000; i++)
    {
        Math.Sqrt(i);
    }

    await Task.Delay(3000) // async I/O
}

我们可以使用一个线程来处理相同的方法的多个请求，因为该线程处理该请求被释放，当你等待的异步操作。

We can use a single thread to process multiple requests of the same method because the thread handling the request is freed up when you await the asynchronous operation.

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