Question

我有一个简单的html文件，例如

<form action="http://www.someurl.com/page.php" method="POST">
   <input type="text" name="test"><br/>
   <input type="submit" name="submit">
</form>

编辑：我可能不太清楚

这个问题

我想编写C＃代码，提交此表单的方式与我将上述html粘贴到文件中时完全相同，用IE打开并用浏览器提交。

Answer 1

这是我最近在接收GET响应的Gateway POST事务中使用的示例脚本。您是否使用自定义C＃表单？无论您的目的是什么，只需使用表单中的参数替换字符串字段（用户名，密码等）。

private String readHtmlPage(string url)
   {

    //setup some variables

    String username  = "demo";
    String password  = "password";
    String firstname = "John";
    String lastname  = "Smith";

    //setup some variables end

      String result = "";
      String strPost = "username="+username+"&password="+password+"&firstname="+firstname+"&lastname="+lastname;
      StreamWriter myWriter = null;

      HttpWebRequest objRequest = (HttpWebRequest)WebRequest.Create(url);
      objRequest.Method = "POST";
      objRequest.ContentLength = strPost.Length;
      objRequest.ContentType = "application/x-www-form-urlencoded";

      try
      {
         myWriter = new StreamWriter(objRequest.GetRequestStream());
         myWriter.Write(strPost);
      }
      catch (Exception e) 
      {
         return e.Message;
      }
      finally {
         myWriter.Close();
      }

      HttpWebResponse objResponse = (HttpWebResponse)objRequest.GetResponse();
      using (StreamReader sr = 
         new StreamReader(objResponse.GetResponseStream()) )
      {
         result = sr.ReadToEnd();

         // Close and clean up the StreamReader
         sr.Close();
      }
      return result;
   }

Answer 2

您的HTML文件不会直接与C＃交互，但您可以编写一些C＃，就像它是HTML文件一样。

例如：有一个名为System.Net.WebClient的类，其方法很简单：

using System.Net;
using System.Collections.Specialized;

...
using(WebClient client = new WebClient()) {

    NameValueCollection vals = new NameValueCollection();
    vals.Add("test", "test string");
    client.UploadValues("http://www.someurl.com/page.php", vals);
}

有关更多文档和功能，请参阅MSDN page.

Answer 3

您可以使用HttpWebRequest类来执行此操作。

示例here：

using System;
using System.Net;
using System.Text;
using System.IO;


    public class Test
    {
        // Specify the URL to receive the request.
        public static void Main (string[] args)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create (args[0]);

            // Set some reasonable limits on resources used by this request
            request.MaximumAutomaticRedirections = 4;
            request.MaximumResponseHeadersLength = 4;
            // Set credentials to use for this request.
            request.Credentials = CredentialCache.DefaultCredentials;
            HttpWebResponse response = (HttpWebResponse)request.GetResponse ();

            Console.WriteLine ("Content length is {0}", response.ContentLength);
            Console.WriteLine ("Content type is {0}", response.ContentType);

            // Get the stream associated with the response.
            Stream receiveStream = response.GetResponseStream ();

            // Pipes the stream to a higher level stream reader with the required encoding format. 
            StreamReader readStream = new StreamReader (receiveStream, Encoding.UTF8);

            Console.WriteLine ("Response stream received.");
            Console.WriteLine (readStream.ReadToEnd ());
            response.Close ();
            readStream.Close ();
        }
    }

/*
The output from this example will vary depending on the value passed into Main 
but will be similar to the following:

Content length is 1542
Content type is text/html; charset=utf-8
Response stream received.
<html>
...
</html>

*/

Answer 4

Response.Write("<script> try {this.submit();} catch(e){} </script>");

Answer 5

我需要一个按钮处理程序，在客户端浏览器中为另一个应用程序创建一个表单帖子。我找到了这个问题，但没有看到适合我的情况的答案。这就是我想出的：

      protected void Button1_Click(object sender, EventArgs e)
        {

            var formPostText = @"<html><body><div>
<form method=""POST"" action=""OtherLogin.aspx"" name=""frm2Post"">
  <input type=""hidden"" name=""field1"" value=""" + TextBox1.Text + @""" /> 
  <input type=""hidden"" name=""field2"" value=""" + TextBox2.Text + @""" /> 
</form></div><script type=""text/javascript"">document.frm2Post.submit();</script></body></html>
";
            Response.Write(formPostText);
        }

Answer 6

我在MVC中遇到过类似的问题（导致我遇到这个问题）。

我收到一个FORM作为来自WebClient.UploadValues（）请求的字符串响应，然后我必须提交 - 所以我不能使用第二个WebClient或HttpWebRequest。该请求返回了字符串。

using (WebClient client = new WebClient())
  {
    byte[] response = client.UploadValues(urlToCall, "POST", new NameValueCollection()
    {
        { "test", "value123" }
    });

    result = System.Text.Encoding.UTF8.GetString(response);
  }

我可以用来解决OP的解决方案是将Javascript自动提交附加到代码的末尾，然后使用@ Html.Raw（）在Razor页面上呈现它。

result += "<script>self.document.forms[0].submit()</script>";
someModel.rawHTML = result;
return View(someModel);

Razor Code：

@model SomeModel

@{
    Layout = null;
}

@Html.Raw(@Model.rawHTML)

我希望这可以帮助那些发现自己处于相同情况的人。

如何使用C＃提交http表单

6 个答案: