使用HttpWebRequest提交ASP.NET表单并保持Session和Cookie

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Net;

namespace WinTest

{

/// <summary>

/// 通过程序自动填充并提交ASP.NET表单(Form)

/// </summary>

public partial class AutoPost : Form

{

public AutoPost()

{

InitializeComponent();

}

private void AutoPost_Load(object sender, EventArgs e)

{

}

private void postTestButton_Click(object sender, EventArgs e)

{

PostByWebRequest();

}

private void PostByWebRequest()

{

try

{

CookieContainer cookieContainer = new CookieContainer();

///////////////////////////////////////////////////

// 1.打开 MyLogin.aspx 页面，获得 GetVeiwState & EventValidation

///////////////////////////////////////////////////

// 设置打开页面的参数

string URI = "http://localhost:1165/WebTest/MyLogin.aspx";

HttpWebRequest request = WebRequest.Create(URI) as HttpWebRequest;

request.Method = "GET";

request.KeepAlive = false;

// 接收返回的页面

HttpWebResponse response = request.GetResponse() as HttpWebResponse;

System.IO.Stream responseStream = response.GetResponseStream();

System.IO.StreamReader reader = new System.IO.StreamReader(responseStream,Encoding.UTF8);

string srcString = reader.ReadToEnd();

// 获取页面的 VeiwState

string viewStateFlag = "id=\"__VIEWSTATE\" value=\"";

int i = srcString.IndexOf(viewStateFlag) + viewStateFlag.Length;

int j = srcString.IndexOf("\"", i);

string viewState = srcString.Substring(i, j - i);

// 获取页面的 EventValidation

string eventValidationFlag = "id=\"__EVENTVALIDATION\" value=\"";

i = srcString.IndexOf(eventValidationFlag) + eventValidationFlag.Length;

j = srcString.IndexOf("\"", i);

string eventValidation = srcString.Substring(i, j - i);

///////////////////////////////////////////////////

// 2.自动填充并提交 MyLogin.aspx 页面

///////////////////////////////////////////////////

// 提交按钮的文本

string submitButton = "登录";

// 用户名和密码

string userName = "1";

string password = "1";

// 将文本转换成 URL 编码字符串

viewState = System.Web.HttpUtility.UrlEncode(viewState);

eventValidation = System.Web.HttpUtility.UrlEncode(eventValidation);

submitButton = System.Web.HttpUtility.UrlEncode(submitButton);

// 要提交的字符串数据。格式形如:user=uesr1&password=123

string formatString = "userName={0}&password={1}&loginButton={2}&__VIEWSTATE={3}&__EVENTVALIDATION={4}";

string postString = string.Format(formatString, userName, password, submitButton, viewState, eventValidation);

// 将提交的字符串数据转换成字节数组

byte[] postData = Encoding.ASCII.GetBytes(postString);

// 设置提交的相关参数

request = WebRequest.Create(URI) as HttpWebRequest;

request.Method = "POST";

request.KeepAlive = false;

request.ContentType = "application/x-www-form-urlencoded";

request.CookieContainer = cookieContainer;

request.ContentLength = postData.Length;

// 提交请求数据

System.IO.Stream outputStream = request.GetRequestStream();

outputStream.Write(postData, 0, postData.Length);

outputStream.Close();

// 接收返回的页面

response = request.GetResponse() as HttpWebResponse;

responseStream = response.GetResponseStream();

reader = new System.IO.StreamReader(responseStream,Encoding.GetEncoding("GB2312"));

srcString = reader.ReadToEnd();

///////////////////////////////////////////////////

// 3.打开 Default.aspx 页面

///////////////////////////////////////////////////

// 设置打开页面的参数

URI = "http://localhost:1165/WebTest/Default.aspx";

request = WebRequest.Create(URI) as HttpWebRequest;

request.Method = "GET";

request.KeepAlive = false;

request.CookieContainer = cookieContainer;

// 接收返回的页面

response = request.GetResponse() as HttpWebResponse;

responseStream = response.GetResponseStream();

reader = new System.IO.StreamReader(responseStream, Encoding.UTF8);

srcString = reader.ReadToEnd();

///////////////////////////////////////////////////

// 4.分析返回的页面

///////////////////////////////////////////////////

//

}

catch (WebException we)

{

string msg = we.Message;

}

}

}

}