“System.Net.HttpWebRequest'不包含'GetRequestStream”的定义

问题描述

我是新来的两个C＃和Windows Phone，我试图做一个小的应用程序，执行一个JSON请求。我下面这个职位的例子

I am new to both C# and Windows phone and am trying to make a small app that performs a JSON request. I am following the example in this post http://stackoverflow.com/a/4988809/702638

我当前的代码是这样的：

My current code is this:

public string login()
{
    var httpWebRequest = (HttpWebRequest)WebRequest.Create(MY_URL);
    httpWebRequest.ContentType = "text/plain"; 
    httpWebRequest.Method      = "POST";

    using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
    {
       string text = MY_JSON_STRING;
       streamWriter.Write(text);
    }
}

但由于某些原因的Visual Studio的颓势 GetRequestStream（）一个错误信息：

错误CS1061：'System.Net.HttpWebRequest不包含'GetRequestStream'，没有扩展方法
A
定义'GetRequestStream接受式
'System.Net.HttpWebRequest'的第一个参数可以找到（是否缺少使用
指令或程序集引用？）

这是为什么这会是发生什么想法？我已经导入了<$​​ C $ C> System.Net 包。

Any thoughts on why this would be happening? I have already imported the System.Net package.

推荐答案

HttpWebRequest的的不WP8拥有的 GetRequestStream 或 GetRequestStreamAsync 的。最好的办法是创建一个任务并等待其上，像这样：使用（VAR流

HttpWebRequest doesn't have a GetRequestStream or GetRequestStreamAsync in WP8. Your best bet is to create a Task and await on it, like so:

using (var stream = await Task.Factory.FromAsync<Stream>(request.BeginGetRequestStream, request.EndGetRequestStream, null))
{
    // ...
}

编辑：正如您所提到的，你是新的C＃，你需要让你的登录方法是异步使用的await关键字：

as you've mentioned that you're new to C#, you would need to have your login method be async to use the await keyword:

public async Task<string> LoginAsync()
{
    // ...
}

呼叫者登录需要使用电话时的await关键字：

Callers to login would need to use the await keyword when calling:

string result = await foo.LoginAsync();

下面是关于这个问题的好底漆：的

Here's a good primer on the subject: http://msdn.microsoft.com/en-us/library/vstudio/hh191443.aspx

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