在 Xamarin Forms C# 中发送 HTTP Post 请求

问题描述

在我开始之前，我想说我已经用谷歌搜索了这个问题的解决方案，但要么不理解它们(我是新手)要么它们不起作用.

Before I start, I would like to say that I have googled solutions to this problem but have either not understood them (I am a newbie) or they do not work.

我想要做的是将 JSON 数据发送到 localhost:8000 上的 REST API，格式如下:

What I want to do is send JSON data to a REST API on localhost:8000, in this format:

{
    "username" : "myusername",
    "password" : "mypass"
}

然后，我期望一个包含字符串标记的响应，如下所示，

Then, I expect a response which holds a string token, like the following,

{
    "token" : "rgh2ghgdsfds"
}

如何发送json数据，然后从响应中解析token?我见过这样做的同步方法，但由于某种原因，它们不起作用(或者仅仅是因为我不知道它在哪个命名空间中).如果您采用异步方式来执行此操作，能否请您向我解释一下它是如何工作的?

How do send the json data and then parse the token from the response?I have seen synchronous methods of doing this but for some reason, they do not work (or simply because I do not know what namespace it is in). If you apply an async way of doing this, could you please explain to me how it works?

提前致谢.

推荐答案

我使用 HttpClient.一个简单的例子:

I use HttpClient. A simple example:

var client = new HttpClient();
client.BaseAddress = new Uri("localhost:8080");

string jsonData = @"{""username"" : ""myusername"", ""password"" : ""mypassword""}"

var content = new StringContent (jsonData, Encoding.UTF8, "application/json");
HttpResponseMessage response = await client.PostAsync("/foo/login", content);

// this result string should be something like: "{"token":"rgh2ghgdsfds"}"
var result = await response.Content.ReadAsStringAsync();

其中 "/foo/login" 需要指向您的 HTTP 资源.例如，如果您有一个带有 Login 方法的 AccountController，那么您将使用类似 "/foo/login" 的东西代替 "/foo/login">"/账户/登录".

Where "/foo/login" will need to point to your HTTP resource. For example, if you have an AccountController with a Login method, then instead of "/foo/login" you would use something like "/Account/Login".

一般来说，为了处理序列化和反序列化，我建议使用像 Json.Net 这样的工具.

In general though, to handle the serializing and deserializing, I recommend using a tool like Json.Net.

至于它如何工作的问题，这里有很多事情要做.如果您对 async/await 的工作原理有疑问，那么我建议您阅读 Asynchronous Programming在 MSDN 上使用异步和等待

As for the question about how it works, there is a lot going on here. If you have questions about how the async/await stuff works then I suggest you read Asynchronous Programming with Async and Await on MSDN

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