支持Cookie的WebClient

实际上,这段代码是网上的,但是由于设置Cookie相对麻烦,所以增加了设置Cookie的方法.

另外,对Cookie中的’,’符号进行了转意,用了3个多月了,没有发现有什么问题,好久没有发文章了,今天抽空就发出来把 ^ ^

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

namespace JointOfficial.Model
{
    /// <summary>
    /// 支持 Session 和 Cookie 的 WebClient。
    /// </summary>
    public class HttpClient : WebClient
    {
        // Cookie 容器
        private CookieContainer cookieContainer;

        /// <summary>
        /// 创建一个新的 WebClient 实例。
        /// </summary>
        public HttpClient()
        {
            this.cookieContainer = new CookieContainer();
        }

        /// <summary>
        /// 创建一个新的 WebClient 实例。
        /// </summary>
        /// <param name="cookie">Cookie 容器</param>
        public HttpClient(CookieContainer cookies)
        {
            this.cookieContainer = cookies;
        }

        /// <summary>
        /// Cookie 容器
        /// </summary>
        public CookieContainer Cookies
        {
            get { return this.cookieContainer; }
            set { this.cookieContainer = value; }
        }

        /// <summary>
        /// 坑爹之用
        /// </summary>
        public object Tag { get; set; }

        /// <summary>
        ///     设置Cookie
        /// </summary>
        /// <param name="cookieString" type="string">
        ///     <para>
        ///         以String存储的Cookie
        ///     </para>
        /// </param>
        /// <param name="domain" type="string">
        ///     <para>
        ///         Cookie的作用域
        ///     </para>
        /// </param>
        /// <returns>
        ///     A System.Net.CookieContainer value...
        /// </returns>
        public CookieContainer SetCookies(string cookieString, string domain)
        {
            string[] tempCookies = cookieString.Split(';');
            string tempCookie = null;
            int Equallength = 0;//  =的位置 
            string cookieKey = null;
            string cookieValue = null;
            CookieContainer cc = new CookieContainer();
            for (int i = 0; i < tempCookies.Length; i++)
            {
                if (!string.IsNullOrEmpty(tempCookies[i]))
                {
                    tempCookie = tempCookies[i];
                    Equallength = tempCookie.IndexOf("=");
                    if (Equallength != -1)       //有可能cookie 无=，就直接一个cookiename；比如:a=3;ck;abc=; 
                    {
                        cookieKey = tempCookie.Substring(0, Equallength).Trim();
                        if (Equallength == tempCookie.Length - 1)    //这种是等号后面无值，如：abc=; 
                        {
                            cookieValue = "";
                        }
                        else
                        {
                            cookieValue = tempCookie.Substring(Equallength + 1, tempCookie.Length - Equallength - 1).Trim();
                        }
                    }
                    else
                    {
                        cookieKey = tempCookie.Trim();
                        cookieValue = "";
                    }
                    cookieValue = cookieValue.Replace(",", "%2C");//针对Cookie中的特殊符号','进行转换
                    cc.Add(new Cookie(cookieKey, cookieValue, "", domain));
                }
            }
            this.Cookies = cc;
            return cc;
        }

        /// <summary>
        /// 返回带有 Cookie 的 HttpWebRequest。
        /// </summary>
        /// <param name="address"></param>
        /// <returns></returns>
        protected override WebRequest GetWebRequest(Uri address)
        {
            WebRequest request = base.GetWebRequest(address);
            if (request is HttpWebRequest)
            {
                HttpWebRequest httpRequest = request as HttpWebRequest;
                httpRequest.CookieContainer = cookieContainer;
            }
            return request;
        }

        #region 封装了PostData, GetSrc 和 GetFile 方法
        /// <summary>
        /// 向指定的 URL POST 数据，并返回页面
        /// </summary>
        /// <param name="uriString">POST URL</param>
        /// <param name="postString">POST 的 数据</param>
        /// <param name="postStringEncoding">POST 数据的 CharSet</param>
        /// <param name="dataEncoding">页面的 CharSet</param>
        /// <returns>页面的源文件</returns>
        public string PostData(string uriString, string postString, string postStringEncoding, string dataEncoding, out string msg)
        {
            try
            {
                // 将 Post 字符串转换成字节数组
                byte[] postData = Encoding.GetEncoding(postStringEncoding).GetBytes(postString);
                this.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
                // 上传数据，返回页面的字节数组
                byte[] responseData = this.UploadData(uriString, "POST", postData);
                // 将返回的将字节数组转换成字符串(HTML);
                string srcString = Encoding.GetEncoding(dataEncoding).GetString(responseData);
                srcString = srcString.Replace("\t", "");
                srcString = srcString.Replace("\r", "");
                srcString = srcString.Replace("\n", "");
                msg = string.Empty;
                return srcString;
            }
            catch (WebException we)
            {
                msg = we.Message;
                return string.Empty;
            }
        }

        /// <summary>
        /// 获得指定 URL 的源文件
        /// </summary>
        /// <param name="uriString">页面 URL</param>
        /// <param name="dataEncoding">页面的 CharSet</param>
        /// <returns>页面的源文件</returns>
        public string GetSrc(string uriString, string dataEncoding, out string msg)
        {
            try
            {
                // 返回页面的字节数组
                byte[] responseData = this.DownloadData(uriString);
                // 将返回的将字节数组转换成字符串(HTML);
                string srcString = Encoding.GetEncoding(dataEncoding).GetString(responseData);
                srcString = srcString.Replace("\t", "");
                srcString = srcString.Replace("\r", "");
                srcString = srcString.Replace("\n", "");
                msg = string.Empty;
                return srcString;
            }
            catch (WebException we)
            {
                msg = we.Message;
                return string.Empty;
            }
        }

        /// <summary>
        /// 从指定的 URL 下载文件到本地
        /// </summary>
        /// <param name="uriString">文件 URL</param>
        /// <param name="fileName">本地文件的完成路径</param>
        /// <returns></returns>
        public bool GetFile(string urlString, string fileName, out string msg)
        {
            try
            {
                this.DownloadFile(urlString, fileName);
                msg = string.Empty;
                return true;
            }
            catch (WebException we)
            {
                msg = we.Message;
                return false;
            }
        }
        #endregion
    }
}