WebClient 下载超时

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/// <summary>   /// Geovin Du geovindu 塗聚文  涂聚文   /// </summary>   public class NewWebClient : WebClient   {       private int _timeout;         /// <summary>       /// 超时时间(毫秒)       /// </summary>       public int Timeout       {           get           {               return _timeout;           }           set           {               _timeout = value;           }       }       /// <summary>       ///       /// </summary>       public NewWebClient()       {           this._timeout = 60000;       }       /// <summary>       ///       /// </summary>       /// <param name="timeout"></param>       public NewWebClient(int timeout)       {           this._timeout = timeout;       }       /// <summary>       ///       /// </summary>       /// <param name="address"></param>       /// <returns></returns>       protected override WebRequest GetWebRequest(Uri address)       {           //WebClient里上传下载的方法很多，但最终应该都是调用了这个方法           HttpWebRequest request = (HttpWebRequest)base.GetWebRequest(address);           request.Timeout = Timeout;           request.ReadWriteTimeout = Timeout;           return request;         }   }       public class Calculagraph   {       /// <summary>       /// 时间到事件       /// </summary>       public event TimeoutCaller TimeOver;         /// <summary>       /// 开始时间       /// </summary>       private DateTime _startTime;       private TimeSpan _timeout = new TimeSpan(0, 0, 10);       private bool _hasStarted = false;       object _userdata;         /// <summary>       /// 计时器构造方法       /// </summary>       /// <param name="userdata">计时结束时回调的用户数据</param>       public Calculagraph(object userdata)       {           TimeOver += new TimeoutCaller(OnTimeOver);           _userdata = userdata;       }         /// <summary>       /// 超时退出       /// </summary>       /// <param name="userdata"></param>       public virtual void OnTimeOver(object userdata)       {           Stop();       }         /// <summary>       /// 过期时间(秒)       /// </summary>       public int Timeout       {           get           {               return _timeout.Seconds;           }           set           {               if (value <= 0)                   return;               _timeout = new TimeSpan(0, 0, value);           }       }         /// <summary>       /// 是否已经开始计时       /// </summary>       public bool HasStarted       {           get           {               return _hasStarted;           }       }         /// <summary>       /// 开始计时       /// </summary>       public void Start()       {           Reset();           _hasStarted = true;           Thread th = new Thread(WaitCall);           th.IsBackground = true;           th.Start();       }         /// <summary>       /// 重置       /// </summary>       public void Reset()       {           _startTime = DateTime.Now;       }         /// <summary>       /// 停止计时       /// </summary>       public void Stop()       {           _hasStarted = false;       }         /// <summary>       /// 检查是否过期       /// </summary>       /// <returns></returns>       private bool checkTimeout()       {           return (DateTime.Now - _startTime).Seconds >= Timeout;       }         private void WaitCall()       {           try           {               //循环检测是否过期               while (_hasStarted && !checkTimeout())               {                   Thread.Sleep(1000);               }               if (TimeOver != null)                   TimeOver(_userdata);           }           catch (Exception)           {               Stop();           }       }   }     /// <summary>   /// 过期时回调委托   /// </summary>   /// <param name="userdata"></param>   public delegate void TimeoutCaller(object userdata);     /// <summary>   ///   /// </summary>   public class DuWebClient : WebClient   {         private Calculagraph _timer;       private int _timeOut = 10;         /// <summary>       /// 过期时间       /// </summary>       public int Timeout       {           get           {               return _timeOut;           }           set           {               if (value <= 0)                   _timeOut = 10;               _timeOut = value;           }       }                 /// <summary>       ///       /// </summary>       public DuWebClient()       {           this._timeOut = 60000;       }       /// <summary>       ///       /// </summary>       /// <param name="timeout"></param>       public DuWebClient(int timeout)       {           this._timeOut = timeout;       }           /// <summary>       /// 重写GetWebRequest,添加WebRequest对象超时时间       /// </summary>       /// <param name="address"></param>       /// <returns></returns>       protected override WebRequest GetWebRequest(Uri address)       {           HttpWebRequest request = (HttpWebRequest)base.GetWebRequest(address);           request.Timeout = 1000 * Timeout;           request.ReadWriteTimeout = 1000 * Timeout;           return request;       }         /// <summary>       /// 带过期计时的下载       /// </summary>       public void DownloadFileAsyncWithTimeout(Uri address, string fileName, object userToken)       {           if (_timer == null)           {               _timer = new Calculagraph(this);               _timer.Timeout = Timeout;               _timer.TimeOver += new TimeoutCaller(_timer_TimeOver);               this.DownloadProgressChanged += new DownloadProgressChangedEventHandler(CNNWebClient_DownloadProgressChanged);           }             DownloadFileAsync(address, fileName, userToken);           _timer.Start();       }         /// <summary>       /// WebClient下载过程事件，接收到数据时引发       /// </summary>       /// <param name="sender"></param>       /// <param name="e"></param>       void CNNWebClient_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)       {           _timer.Reset();//重置计时器       }         /// <summary>       /// 计时器过期       /// </summary>       /// <param name="userdata"></param>       void _timer_TimeOver(object userdata)       {           this.CancelAsync();//取消下载       }   }

　　

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string url = "http://www.dusystem.com/DuBooket/JwBookTest.ashx?DuQuery=" + projectid; //&jsonpCallback=?                                           context.Response.AddHeader("Access-Control-Allow-Origin", "http://intranet.lukfook.com.hk/");                     context.Response.ContentType = "application/json ;charset=utf-8";                                          //1                     //WebClient wc = new WebClient();                     //wc.Headers["User-Agent"] = "blah";                     //wc.Encoding = System.Text.Encoding.UTF8;//定义对象语言  Geovin Du 涂聚文                     //byte[] btWeb = wc.DownloadData(url);                                           //2                     //NewWebClient wc = new NewWebClient(30 * 60 * 1000);                     //byte[] btWeb = wc.DownloadData(url);                     //wc.Headers["User-Agent"] = "blah";                     //wc.Encoding = System.Text.Encoding.UTF8;                     //json = Encoding.GetEncoding("GB2312").GetString(btWeb);                       //3                     DuWebClient wc = new DuWebClient(30 * 60 * 1000);                     byte[] btWeb = wc.DownloadData(url);                     wc.Headers["User-Agent"] = "blah";                     wc.Encoding = System.Text.Encoding.UTF8;                       json = System.Text.Encoding.UTF8.GetString(btWeb);                     context.Response.ContentType = "text/plain";                     context.Response.Write(json);

　　

 

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1	safari 下載亂碼問題

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/*                  * safari相对比较变态, filename部分只能使用utf-8的原始字节，而http header 必须使用单字节编码的字符串, 因此需要将原始内容重新构造为iso-8859-1单字节编码的字符串，即：new String(filename.getBytes("UTF-8"),"ISO8859-1")                  * 编码方式  |  测试通过的浏览器                 new String(filename.getBytes("UTF-8"),"ISO8859-1") 前端-后台   base_name.getBytes("ISO-8859-1"),"UTF-8") 后台-前端   base_name.getBytes("GB2312"),"ISO-8859-1") RFC2231 filename* |   ie9 ,chrome17 , opera11,firefox11   iso-8859-1 (utf-8):  |  chrome,opera,firefox,safari   url-encode(utf-8)  |    ie6+ (文件名必须带扩展名), chrome\opera(%2B 加号不识别)     因此兼容规则设置为  ie: urlEncode  , opera\firefox : filename*,  safari\chrome: iso-8859-1 比较合适                  * 各浏览器支持的对应编码格式为：   1.  IE浏览器，采用URLEncoder编码 2.  Opera浏览器，采用filename*方式 3.  Safari浏览器，采用ISO编码的中文输出 4.  Chrome浏览器，采用Base64编码或ISO编码的中文输出 5.  FireFox浏览器，采用Base64或filename*或ISO编码的中文输出     new_filename = URLEncoder.encode(filename, "UTF8");  // 如果没有UA，则默认使用IE的方式进行编码，因为毕竟IE还是占多数的  rtn = "filename=\"" + new_filename + "\"";  if (userAgent != null)  {       userAgent = userAgent.toLowerCase();        // IE浏览器，只能采用URLEncoder编码       if (userAgent.indexOf("msie") != -1)      {          rtn = "filename=\"" + new_filename + "\"";      }       // Opera浏览器只能采用filename*       else if (userAgent.indexOf("opera") != -1)       {          rtn = "filename*=UTF-8''" + new_filename;      }      // Safari浏览器，只能采用ISO编码的中文输出        else if (userAgent.indexOf("safari") != -1 )        {            rtn = "filename=\"" + new String(filename.getBytes("UTF-8"),"ISO8859-1") + "\"";   //java       }        // Chrome浏览器，只能采用MimeUtility编码或ISO编码的中文输出        else if (userAgent.indexOf("applewebkit") != -1 )         {           new_filename = MimeUtility.encodeText(filename, "UTF8", "B");            rtn = "filename=\"" + new_filename + "\"";         }        // FireFox浏览器，可以使用MimeUtility或filename*或ISO编码的中文输出         else if (userAgent.indexOf("mozilla") != -1)         {            rtn = "filename*=UTF-8''" + new_filename;        }     }                                                                              */

　　

https://www.codeproject.com/articles/1088703/how-to-detect-browsers-in-asp-net-with-browser-fil
Chrome 47

Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36

Firefox 43

Mozilla/5.0 (Windows NT 10.0; WOW64; rv:40.0) Gecko/20100101 Firefox/43.0

Safari 8

Mozilla/5.0 (iPhone; CPU iPhone OS 8_4_1 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12H321 Safari/600.1.4

IE 11

Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko

Edge

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.10240

Opera

Opera/9.80 (Windows NT 6.0) Presto/2.12.388 Version/12.14

Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.73 Safari/537.36 OPR/34.0.2036.25

Silk 2

Mozilla/5.0 (Linux; U; en-us; KFTT Build/IML74K) AppleWebKit/535.19 (KHTML, like Gecko) Silk/2.1 Safari/535.19 Silk-Accelerated=true

Maxthon 4

Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Maxthon/4.4.1.5000 Chrome/30.0.1599.101 Safari/537.36

SeaMonkey 8

Mozilla/5.0 (Windows; U; Windows NT 10.0; WOW64; rv:1.8.0.7) Gecko/20110321 MultiZilla/4.33.2.6a SeaMonkey/8.6.55

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public bool IsMacOS(string userAgent) {     var osInfo = userAgent.Split(new Char[] { '(', ')' })[1];     return osInfo.Contains("Mac_PowerPC") || osInfo.Contains("Macintosh"); }       HttpBrowserCapabilities moo = HttpContext.Current.Request.Browser;       StringBuilder sb = new StringBuilder();       sb.Append("<p>Browser Capabilities:</p>");     sb.Append("Type = " + moo.Type + "<br>");     sb.Append("Name = " + moo.Browser + "<br>");     sb.Append("Version = " + moo.Version + "<br>");     sb.Append("Major Version = " + moo.MajorVersion + "<br>");     sb.Append("Minor Version = " + moo.MinorVersion + "<br>");     sb.Append("Platform = " + moo.Platform + "<br>");     sb.Append("Is Beta = " + moo.Beta + "<br>");     sb.Append("Is Crawler = " + moo.Crawler + "<br>");     sb.Append("Is AOL = " + moo.AOL + "<br>");     sb.Append("Is Win16 = " + moo.Win16 + "<br>");     sb.Append("Is Win32 = " + moo.Win32 + "<br>");     sb.Append("Supports Frames = " + moo.Frames + "<br>");     sb.Append("Supports Tables = " + moo.Tables + "<br>");     sb.Append("Supports Cookies = " + moo.Cookies + "<br>");     sb.Append("Supports VB Script = " + moo.VBScript + "<br>");           sb.Append("Supports ActiveX Controls = " + moo.ActiveXControls + "<br>");     sb.Append("CDF = " + moo.CDF + "<br>");  /// <summary>         ///         /// </summary>         /// <param name="message"></param>         /// <returns></returns>         private string UtfToIso(string message)         {             Encoding iso = Encoding.GetEncoding("ISO-8859-1");             Encoding utf8 = Encoding.UTF8;             byte[] utfBytes = utf8.GetBytes(message);             byte[] isoBytes = Encoding.Convert(utf8, iso, utfBytes);             string msg = iso.GetString(isoBytes);             return msg;         }         /// <summary>         ///         /// </summary>         /// <param name="message"></param>         /// <returns></returns>         private string IsoDecode(string message)         {             string result = "";               Encoding iso = Encoding.GetEncoding("iso-8859-1");             Encoding utf8 = Encoding.UTF8;             byte[] isoBytes = iso.GetBytes(message);             byte[] utf8Bytes = Encoding.Convert(iso, utf8, isoBytes);             result = utf8.GetString(utf8Bytes);             return result;         }