Windows Phone 8与AWAIT异步JSON

我正在尝试为Windows Phone 8编写一个库，并且想知道是否可以使用不使用回调而使用await关键字来使用JSON？或者我误解了这是如何工作的？Windows Phone 8与AWAIT异步JSON

基本上我想要的应用可以说：

string result = Library.Ping(var1, var2);

库连接到Web服务和反序列化JSON的动态对象的内容。然后它将其返回到已将请求发送到库的主应用程序。

来源

2012-12-13 Omar Mir

见的情况下，联答案的网站宕机：

using System; 
using System.Collections.Generic; 
using System.IO; 
using System.Linq; 
using System.Net; 
using System.Text; 
using System.Threading.Tasks; 
using System.ComponentModel; 

namespace Win8WinPhone.CodeShare.Extensions 
{ 
    public static class HttpExtensions 
    { 
     public static Task<Stream> GetRequestStreamAsync(this HttpWebRequest request) 
     { 
      var taskComplete = new TaskCompletionSource<Stream>(); 
      request.BeginGetRequestStream(ar => 
      { 
       Stream requestStream = request.EndGetRequestStream(ar); 
       taskComplete.TrySetResult(requestStream); 
      }, request); 
      return taskComplete.Task; 
     } 

     public static Task<HttpWebResponse> GetResponseAsync(this HttpWebRequest request) 
     { 
      var taskComplete = new TaskCompletionSource<HttpWebResponse>(); 
      request.BeginGetResponse(asyncResponse => 
      { 
       try 
       { 
        HttpWebRequest responseRequest = (HttpWebRequest)asyncResponse.AsyncState; 
        HttpWebResponse someResponse = (HttpWebResponse)responseRequest.EndGetResponse(asyncResponse); 
        taskComplete.TrySetResult(someResponse); 
       } 
       catch (WebException webExc) 
       { 
        HttpWebResponse failedResponse = (HttpWebResponse)webExc.Response; 
        taskComplete.TrySetResult(failedResponse); 
       } 
      }, request); 
      return taskComplete.Task; 
     } 
    } 

    public static class HttpMethod 
    { 
     public static string Head { get{return "HEAD";} } 
     public static string Post { get{return "POST";} } 
     public static string Put { get{return "PUT";} } 
     public static string Get { get{return "GET";} } 
     public static string Delete { get{return "DELETE";} } 
     public static string Trace { get{return "TRACE";} } 
     public static string Options { get{return "OPTIONS";} } 
     public static string Connect { get{return "CONNECT";} } 
     public static string Patch { get{return "PATCH";} } 
    } 

}

然后，你可以写你的函数为：

public async Task<string> GetMyData(string urlToCall) 
{ 
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(urlToCall); 
    request.Method = HttpMethod.Get; 
    HttpWebResponse response = (HttpWebResponse)await request.GetResponseAsync(); 
    using (var sr = new StreamReader(response.GetResponseStream())) 
    { 
     return sr.ReadToEnd(); 
    } 
}

而且然后称之为：

Tweet myTweet = await GetTweet(tweetID);

所有功劳分到： @robertftw谁链接到：http://www.windowsphonegeek.com/news/windows-8---windows-phone-code-sharing-httpwebrequest-getresponseasync

来源

2012-12-17 00:27:03

您也可以立即安装预发行版便携式HttpClient程序包。然后你可以使用本地的异步友好的HttpClient。 – kamranicus

@subkamran - 可下载的链接？ –

@Robert Oschler https://www.nuget.org/packages/Microsoft.Net.Http –

你可以非常接近。你最终会得到的是：

string result = await Library.PingAsync(var1, var2);

首先，安装Microsoft.Bcl.Async。你Library.PingAsync会有这样的结构：

public static async Task<string> PingAsync(MyType1 var1, MyType2 var2) 
{ 
    var client = new WebClient(); 
    var stringResult = client.DownloadStringTaskAsync(..); 
    return JSON.Parse(stringResult).Whatever; 
}

来源

2012-12-14 02:15:53

据我所知，Windows Phone 8不支持HttpClient。任何其他想法？ –

WebClient或者HttpWebRequest。 http://www.windowsphonegeek.com/news/windows-8---windows-phone-code-sharing-httpwebrequest-getresponseasync – robertk

查看更新的答案。 –

Windows Phone 8与AWAIT异步JSON

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