如何使用C#提交http表单
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How to submit http form using C#
提问by JC.
I have a simple html file such as
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>
Edit: I may not have been clear enough with the question
编辑：我可能对这个问题不够清楚
I want to write C# code which submits this form in the exact same manner that would occur had I pasted the above html into a file, opened it with IE and submitted it with the browser.
我想编写 C# 代码，它以完全相同的方式提交这个表单，如果我将上面的 html 粘贴到一个文件中，用 IE 打开它并用浏览器提交它。
回答by Sklivvz
You can use the HttpWebRequestclass to do so.
您可以使用HttpWebRequest类来执行此操作。
Example here:
这里的例子：
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>
*/
回答by Jeff Meatball Yang
Your HTML file is not going to interact with C# directly, but you can write some C# to behave as if it were the HTML file.
您的 HTML 文件不会直接与 C# 交互，但您可以编写一些 C# 使其表现得像 HTML 文件一样。
For example: there is a class called System.Net.WebClient with simple methods:
例如：有一个名为 System.Net.WebClient 的类具有简单的方法：
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);
}
For more documentation and features, refer to the MSDN page.
有关更多文档和功能，请参阅MSDN 页面。
回答by shanabus
Here is a sample script that I recently used in a Gateway POST transaction that receives a GET response. Are you using this in a custom C# form? Whatever your purpose, just replace the String fields (username, password, etc.) with the parameters from your form.
这是我最近在接收 GET 响应的网关 POST 事务中使用的示例脚本。您是否在自定义 C# 表单中使用它？无论您的目的是什么，只需将字符串字段（用户名、密码等）替换为表单中的参数即可。
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;
}
回答by DRiVe
Response.Write("<script> try {this.submit();} catch(e){} </script>");
回答by kangacHASHam
I had a similar issue in MVC (which lead me to this problem).
我在 MVC 中遇到了类似的问题（这导致我遇到了这个问题）。
I am receiving a FORM as a string response from a WebClient.UploadValues() request, which I then have to submit - so I can't use a second WebClient or HttpWebRequest. This request returned the string.
我从 WebClient.UploadValues() 请求接收到一个 FORM 作为字符串响应，然后我必须提交 - 所以我不能使用第二个 WebClient 或 HttpWebRequest。此请求返回字符串。
using (WebClient client = new WebClient())
{
byte[] response = client.UploadValues(urlToCall, "POST", new NameValueCollection()
{
{ "test", "value123" }
});
result = System.Text.Encoding.UTF8.GetString(response);
}
My solution, which could be used to solve the OP, is to append a Javascript auto submit to the end of the code, and then using @Html.Raw() to render it on a Razor page.
我的解决方案可用于解决 OP，是将 Javascript 自动提交附加到代码末尾，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:
剃须刀代码：
@model SomeModel
@{
Layout = null;
}
@Html.Raw(@Model.rawHTML)
I hope this can help anyone who finds themselves in the same situation.
我希望这可以帮助任何发现自己处于相同情况的人。
回答by JDPeckham
I needed to have a button handler that created a form post to another application within the client's browser. I landed on this question but didn't see an answer that suited my scenario. This is what I came up with:
我需要一个按钮处理程序来创建一个表单发布到客户端浏览器中的另一个应用程序。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);
}
