1 using System;  2 using System.Collections.Generic;  3 using System.Linq;  4 using System.Text;  5 using System.Net;  6 using System.IO;  7 using System.Collections.Specialized;  8 using System.Web;  9  10 namespace Common.Helpers 11 { 12     /// <summary> 13     /// 網絡訪問輔助類 14     /// </summary> 15     public class HttpWebClient : WebClient 16     { 17         #region 公共屬性 18         /// <summary> 19         /// 瀏覽器用戶標識,默認采用Chrome的標識 20         /// </summary> 21         public string UserAgent { get; set; } 22         /// <summary> 23         /// Cookie容器 24         /// </summary> 25         public CookieContainer CookieContainer { get; set; } 26         /// <summary> 27         /// 如果 POST 請求需要 100-Continue 響應，則為 true；否則為 false。 28         /// </summary> 29         public bool Expect100Continue { get; set; } 30  31         PRivate WebResponse m_LastWebResponse = null; 32         /// <summary> 33         /// 最后一次的響應對象 34         /// </summary> 35         public WebResponse LastWebResponse { get { return this.m_LastWebResponse; } } 36  37         private int m_Timeout = 120000; 38         /// <summary> 39         /// 超時時間，默認120000毫秒(120秒) 40         /// </summary> 41         public int Timeout 42         { 43             get { return m_Timeout; } 44             set { m_Timeout = value; } 45         } 46  47         private HttpWebClientSetting m_HttpWebClientSetting = null; 48         /// <summary> 49         /// WebClient設置項,該屬性始終不會為null 50         /// </summary> 51         public HttpWebClientSetting HttpWebClientSetting 52         { 53             get 54             { 55                 if (m_HttpWebClientSetting == null) 56                 { 57                     m_HttpWebClientSetting = new HttpWebClientSetting(); 58                 } 59                 return m_HttpWebClientSetting; 60             } 61             set 62             { 63                 m_HttpWebClientSetting = value ?? new HttpWebClientSetting(); 64             } 65         } 66          67  68         /// <summary> 69         /// 預處理Web請求對象的委托方法(會在每次獲取WebRequest對象后調用)，默認值為null 70         /// </summary> 71         public Action<HttpWebRequest> PrepareProcessWebRequest { get; set; } 72         #endregion 73  74         #region 構造方法 75         public HttpWebClient() 76             : this(new CookieContainer()) 77         { 78         } 79  80         public HttpWebClient(CookieContainer cookieContainer) 81         { 82             this.CookieContainer = cookieContainer; 83             this.UserAgent = UserAgentValues.Firefox; 84             this.Expect100Continue = false; 85         } 86         #endregion 87  88         #region 重寫方法，增加對CookieContainer的支持 89         protected override WebRequest GetWebRequest(Uri address) 90         { 91             if (!string.IsNullOrEmpty(this.UserAgent)) 92             { 93                 this.Headers.Add(HttpRequestHeader.UserAgent, this.UserAgent); 94             } 95  96             WebRequest request = base.GetWebRequest(address); 97             request.Timeout = this.Timeout; 98              99             if (request is HttpWebRequest)100             {101                 HttpWebRequest httpRequest = request as HttpWebRequest;102                 httpRequest.CookieContainer = this.CookieContainer;103                 httpRequest.ServicePoint.Expect100Continue = this.Expect100Continue; // 取消100-continue104 105                 //讀取自定義設置項106                 if (this.HttpWebClientSetting != null)107                 {108                     httpRequest.AllowAutoRedirect = this.HttpWebClientSetting.AllowAutoRedirect;109                 }110 111                 //使用外部委托屬性處理Request對象112                 if (this.PrepareProcessWebRequest != null)113                 {114                     this.PrepareProcessWebRequest(httpRequest);115                 }116             }117             118             return request;119         }120         #endregion121 122         #region 重寫方法，增加對響應對象的訪問123         protected override WebResponse GetWebResponse(WebRequest request)124         {125             WebResponse response = base.GetWebResponse(request);126             this.m_LastWebResponse = response;127             return response;128         }129         #endregion130 131         #region (public) 向一個URL用POST提交數據，并返回其響應內容 PostData132         /// <summary>133         /// 向一個URL用POST提交數據，并返回其響應內容134         /// ZhangQingFeng    2014-12-14    Add135         ///    EditLog：136         ///        ZhangQingFeng    2015-05-12    Edit        因WebClient的UpdateValues方法中固定為UTF-8格式進行UrlEncode，因此此處需用UploadString方式來間接實現    --見微軟WebClient類源碼UploadValuesInternal方法中137         /// </summary>138         /// <param name="url">請求的URL</param>139         /// <param name="data">要提交的數據</param>140         /// <param name="encoding">請求所使用的編碼</param>141         /// <param name="responseEncoding">響應內容所使用的編碼，為null時使用請求的編碼</param>142         /// <returns>響應的內容</returns>143         public string PostData(string url, NameValueCollection data, Encoding encoding, Encoding responseEncoding)144         {145             WebClient client = this;146 147             /*148             client.Encoding = encoding ?? Encoding.UTF8;149 150             byte[] response = client.UploadValues(url, "POST", data ?? new NameValueCollection());151 152             string html = string.Empty;153 154             if (responseEncoding == null)155             {156                 html = client.Encoding.GetString(response);157             }158             else159             {160                 html = responseEncoding.GetString(response);161             }162              */163 164             client.Encoding = encoding ?? Encoding.UTF8;165             client.Headers.Add(HttpRequestHeader.ContentType, "application/x-www-form-urlencoded");166 167             string delimiter = String.Empty;168             StringBuilder values = new StringBuilder();169             foreach (string name in data.AllKeys)170             {171                 values.Append(delimiter);172                 values.Append(HttpUtility.UrlEncode(name, encoding));173                 values.Append("=");174                 values.Append(HttpUtility.UrlEncode(data[name], encoding));175                 delimiter = "&";176             }177 178             byte[] arrData = client.UploadData(url, "POST", Encoding.ASCII.GetBytes(values.ToString()));179             string html = (responseEncoding ?? client.Encoding).GetString(arrData);180 181             return html;182         }183 184         /// <summary>185         /// 向一個URL用POST提交數據，并返回其響應內容186         /// ZhangQingFeng    2014-12-14    Add187         /// </summary>188         /// <param name="url">請求的URL</param>189         /// <param name="data">要提交的數據</param>190         /// <param name="encoding">請求和響應所使用的編碼</param>191         /// <returns>響應的內容</returns>192         public string PostData(string url, NameValueCollection data, Encoding encoding)193         {194             return PostData(url, data, encoding, null);195         }196 197         /// <summary>198         /// 向一個URL用POST提交數據，并返回其響應內容(使用this.Encoding來作請求編碼和響應編碼)199         /// ZhangQingFeng    2014-12-14    Add200         /// </summary>201         /// <param name="url">請求的URL</param>202         /// <param name="data">要提交的數據</param>203         /// <returns>響應的內容</returns>204         public string PostData(string url, NameValueCollection data)205         {206             return PostData(url, data, this.Encoding);207         }208         #endregion209 210         #region (public) 向一個URL用POST提交數據，并返回其響應內容 PostData211         /// <summary>212         /// 向一個URL用POST提交數據，并返回其響應內容213         /// ZhangQingFeng    2014-12-14    Add214         /// </summary>215         /// <param name="url">請求的URL</param>216         /// <param name="data">要提交的數據</param>217         /// <param name="encoding">請求和響應內容所使用的編碼</param>218         /// <returns>響應的內容</returns>219         public string PostData(string url, Dictionary<string, string> data, Encoding encoding, Encoding responseEncoding)220         {221             NameValueCollection postData = new NameValueCollection();222             if (data != null)223             {224                 foreach (var item in data)225                 {226                     postData.Add(item.Key, item.Value);227                 }228             }229             return PostData(url, postData, encoding, responseEncoding);230         }231 232 233         /// <summary>234         /// 向一個URL用POST提交數據，并返回其響應內容235         /// ZhangQingFeng    2014-12-14    Add236         /// </summary>237         /// <param name="url">請求的URL</param>238         /// <param name="data">要提交的數據</param>239         /// <param name="encoding">請求和響應所使用的編碼</param>240         /// <returns>響應的內容</returns>241         public string PostData(string url, Dictionary<string, string> data, Encoding encoding)242         {243             return PostData(url, data, encoding, null);244         }245 246         /// <summary>247         /// 向一個URL用POST提交數據，并返回其響應內容(使用this.Encoding來作請求編碼和響應編碼)248         /// ZhangQingFeng    2014-12-14    Add249         /// </summary>250         /// <param name="url">請求的URL</param>251         /// <param name="data">要提交的數據</param>252         /// <returns>響應的內容</returns>253         public string PostData(string url, Dictionary<string, string> data)254         {255             return PostData(url, data, this.Encoding);256         }257         #endregion258 259         #region 輔助類260         /// <summary>261         /// 瀏覽器用戶標識類262         /// </summary>263         public class UserAgentValues264         {265             public static readonly string FireFox = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0";266             public static readonly string Chrome = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36";267             public static readonly string IE8 = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2;)";268         }269         #endregion270     }271 272     /// <summary>273     /// HttpWebClient對象設置類274     /// </summary>275     public class HttpWebClientSetting276     {277         private bool m_AllowAutoRedirect = true;278         /// <summary>279         /// 當響應內容為重定向時客戶端是否自動重定向(如果該屬性為true，則取到的響應則為重定向后的內容，否則則為響應原文)，默認值為true280         /// </summary>281         public bool AllowAutoRedirect282         {283             get { return m_AllowAutoRedirect; }284             set { m_AllowAutoRedirect = value; }285         }286     }287 }