如何在ASP.NET中以编程方式模拟HTTP POST? [英] How to simulate HTTP POST programmatically in ASP.NET?

问题描述

我需要以编程方式模拟HTTP POST，即，我需要生成带有一些POST变量的Request，然后将其发送到页面.

I need to simulate an HTTP POST programmatically, i.e., I need to generate a Request with some POST variables and then send it to a page.

为澄清起见，我需要模拟常规POST的行为，而不是通过编程来完成全部操作.因此，基本上，我需要以与发生表单POST时相同的方式来填充请求，然后将浏览器发送到需要POST的页面.

To clarify, I need to simulate the behaviour of a regular POST, not do the whole thing programmatically. So basically I need to fill in a Request in the same way it would be filled if a form POST was happening, and then send the browser to the page that expects the POST.

推荐答案

这是一种实现方法.

您以NameValueCollection的形式向此方法发送url和name/value参数.该方法在端点上发出Http Post并以字符串形式返回响应.

You send this method the url and the name/value parameters in the form of a NameValueCollection. The method makes a Http Post on the endpoint and returns the response as a string.

当然，这取决于您执行此操作的方式/原因以及此方法将被调用多少次，也许还有其他选择.但是，除非您提供有关特定需求的更多信息，否则此方法就足够了.

Of course depending on what/why you're doing this and how many times this method will be called, there maybe other alternatives. But until you provide more information on your specific needs, this method is good enough.

下面的方法使用Tasks(.NET 4.0)和async方法，因此，例如，如果您在循环中进行多个调用，它将比下一个代码清单所示的同步方法更快.

The method below uses Tasks (.NET 4.0) and the async methods so it will be faster then a synchronous method like the next code listing if you're making multiple calls in a loop for example.

static string GetWebResponse(string url, NameValueCollection parameters)
{
  var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
  httpWebRequest.ContentType = "application/x-www-form-urlencoded";
  httpWebRequest.Method = "POST";

  var sb = new StringBuilder();
  foreach (var key in parameters.AllKeys)
    sb.Append(key + "=" + parameters[key] + "&");
  sb.Length = sb.Length - 1;

  byte[] requestBytes = Encoding.UTF8.GetBytes(sb.ToString());
  httpWebRequest.ContentLength = requestBytes.Length;

  using (var requestStream = httpWebRequest.GetRequestStream())
  {
    requestStream.Write(requestBytes, 0, requestBytes.Length);
    requestStream.Close();
  }

  Task<WebResponse> responseTask = Task.Factory.FromAsync<WebResponse>(httpWebRequest.BeginGetResponse, httpWebRequest.EndGetResponse, null);
  using (var responseStream = responseTask.Result.GetResponseStream())
  {
    var reader = new StreamReader(responseStream);
    return reader.ReadToEnd();
  }
}

您还可以使用WebClient(这有点简单).此方法期望post参数为以下形式的字符串

you could also use WebClient (it's bit simpler). This method expects the post parameters as a string in the form

name1=value1&name2=value2&name3=value3

等因此，如果您使用此方法，请确保按原样传递参数或将实现修改为类似于上面的代码.

etc. So if you use this method be sure to pass in your parameters as such or modify the implementation to be like the code above.

static string HttpPost(string url, string Parameters) 
{
   var req = System.Net.WebRequest.Create(url);       

   req.ContentType = "application/x-www-form-urlencoded";
   req.Method = "POST";
   byte[] bytes = System.Text.Encoding.ASCII.GetBytes(Parameters);
   req.ContentLength = bytes.Length;
   System.IO.Stream os = req.GetRequestStream ();
   os.Write (bytes, 0, bytes.Length);
   os.Close ();
   System.Net.WebResponse resp = req.GetResponse();
   if (resp== null)
     return null;
   var sr = new StreamReader(resp.GetResponseStream());
   return sr.ReadToEnd().Trim();
}

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