using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Net; 
using System.IO;

namespace Czt.Web 
{ 
    /// <summary> 
    /// 实现网站登录类 
    /// </summary> 
    public class Post 
    { 
        /// <summary> 
        /// 网站Cookies 
        /// </summary> 
        private string _cookieHeader = string.Empty; 
        public string CookieHeader 
        { 
            get 
            { 
                return _cookieHeader; 
            } 
            set 
            { 
                _cookieHeader = value; 
            } 
        } 
        /// <summary> 
        /// 网站编码 
        /// </summary> 
        private string _code = string.Empty; 
        public string Code 
        { 
            get { return _code; } 
            set { _code = value; } 
        }

 
        private string _pageContent = string.Empty; 
        public string PageContent 
        { 
            get { return _pageContent; } 
            set { _pageContent = value; } 
        }

        private Dictionary<string, string> _para = new Dictionary<string, string>(); 
        public Dictionary<string, string> Para 
        { 
            get { return _para; } 
            set { _para = value; } 
        }

 
        /**/ 
        /// <summary> 
        /// 功能描述：模拟登录页面，提交登录数据进行登录，并记录Header中的cookie 
        /// </summary> 
        /// <param name="strURL">登录数据提交的页面地址</param> 
        /// <param name="strArgs">用户登录数据</param> 
        /// <param name="strReferer">引用地址</param> 
        /// <param name="code">网站编码</param> 
        /// <returns>可以返回页面内容或不返回</returns> 
        public string PostData(string strURL, string strArgs, string strReferer, string code, string method) 
        { 
            return  PostData(strURL,  strArgs,  strReferer,  code,  method, string.Empty); 
        } 
        public string PostData(string strURL, string strArgs, string strReferer, string code, string method, string contentType) 
        { 
            try 
            { 
                string strResult = ""; 
                HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(strURL); 
                myHttpWebRequest.AllowAutoRedirect = true; 
                myHttpWebRequest.KeepAlive = true; 
                myHttpWebRequest.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/msword, application/x-shockwave-flash, */*"; 
                myHttpWebRequest.Referer = strReferer;

 
                myHttpWebRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 2.0.50727)";

                if (string.IsNullOrEmpty(contentType)) 
                { 
                    myHttpWebRequest.ContentType = "application/x-www-form-urlencoded"; 
                } 
                else 
                { 
                    myHttpWebRequest.ContentType = "contentType"; 
                }

                myHttpWebRequest.Method = method;

                myHttpWebRequest.Headers.Add("Accept-Encoding", "gzip, deflate");

                if (myHttpWebRequest.CookieContainer == null) 
                { 
                    myHttpWebRequest.CookieContainer = new CookieContainer(); 
                }

                if (this.CookieHeader.Length > 0) 
                { 
                    myHttpWebRequest.Headers.Add("cookie:" + this.CookieHeader); 
                    myHttpWebRequest.CookieContainer.SetCookies(new Uri(strURL), this.CookieHeader); 
                }

 

                byte[] postData = Encoding.GetEncoding(code).GetBytes(strArgs); 
                myHttpWebRequest.ContentLength = postData.Length;

                System.IO.Stream P