异步HttpWebRequest的呼叫使用C＃

我有以下代码：异步HttpWebRequest的呼叫使用C＃

//ids are a list of strings 
foreach (string id in ids) 
{ 
    string serviceurl = "https://xxx.xx.xxx/internal/v2/idsearch?id=" + id; 
    List<string> lst = new List<string>(); 
    var task = WebUtil.MakeAsyncRequest("GET", serviceurl, "application/json"); 
    string val = task.Result; 
    if (val != "") 
     lst.Add(val); 
} 

public static Task<string> MakeAsyncRequest(string method,string url, string contentType) 
{ 
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); 
    request.ContentType = contentType; 
    request.Method = method; 
    request.Timeout = 20000; 
    request.Proxy = null; 

    string clientId = ConfigManager.GetClientId; 
    string clientSecret = ConfigManager.GetClientSecret; 
    request.Headers.Add(HttpRequestHeader.Authorization, ConfigManager.GetServiceKey); 
    request.Headers.Add("client_id", clientId); 
    request.Headers.Add("client_secret", clientSecret); 

    Task<WebResponse> task = Task.Factory.FromAsync(
     request.BeginGetResponse, 
     asyncResult => request.EndGetResponse(asyncResult), 
     (object)null); 

    return task.ContinueWith(t => ReadStreamFromResponse(t.Result)); 
} 

private static string ReadStreamFromResponse(WebResponse response) 
{ 
    using (Stream responseStream = response.GetResponseStream()) 
    using (StreamReader sr = new StreamReader(responseStream)) 
    { 
     //Need to return this response 
     string strContent = sr.ReadToEnd(); 
     return strContent; 
    } 
}

这一切工作正常，但我只是不知道如果我正确地实施该async过程，因为它看起来就像是同步做。我真的很感激任何能够帮助我识别我做错什么的人......谢谢！

编辑：

这是我如何解决它....

var taskList = new List<Task<string>>(); 
foreach (string id in ids) 
{ 
    string serviceurl = "https://xxx.xx.xxx/internal/v2/idsearch?id=" + id; 
    taskList.Add(WebUtil.MakeAsyncRequest(serviceurl, "application/json"));  
} 
try 
{ 
    string[] val = await Task.WhenAll(taskList.ToArray()); 
} 
catch (Exception) 
{     
    throw; 
} 

public static async Task<string> MakeAsyncRequest(string url, string contentType) 
    { 

     using (HttpClient client = new HttpClient()) 
     { 
      var requestMessage = new HttpRequestMessage() 
      { 
       RequestUri = new Uri(url), 
       Method = HttpMethod.Get, 
      }; 

      // Add our custom headers 
      requestMessage.Headers.Add("client_id", ConfigManager.GetClientId); 
      requestMessage.Headers.Add("client_secret", ConfigManager.GetClientSecret); 
      requestMessage.Headers.Authorization = new AuthenticationHeaderValue(ConfigManager.GetServiceKey); 
      requestMessage.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue(contentType)); 


      HttpResponseMessage response = await client.SendAsync(requestMessage); 


      var result = await response.Content.ReadAsStringAsync(); 
      string res = result.ToString(); 

      return res; 
     } 

    }

来源

2016-12-07 hialu

你不觉得HttpClient？它包含框中的异步方法 – Egorikas

我想制作async请求的最佳方法是HttpClient。你可以这样写：

var client = new HttpClient(); 
var request = new HttpRequestMessage() 
{ 
    RequestUri = new Uri("xxxxxx"), 
    Method = HttpMethod.Get, 
}; 

request.Headers.Accept.Add(new ....); 
var response = await client.SendAsync(request); 
//read a result from the repsonse

来源

2016-12-07 17:25:00 Egorikas

ReadToEnd是同步的，是的。有异步的等价物。

另请注意，DNS解析在这里是同步的。这是一个始终没有解决的错误。

也许最好的解决方法是使用HttpClient这使得一个字符串异步下载一个字符串。

来源

2016-12-07 17:19:47 usr

异步HttpWebRequest的呼叫使用C＃

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