asp.net 页面使用了多线程去保存内容中的远程图片，应用程序池经常崩溃是什么原因？

悬赏园豆：20 [已关闭问题] 关闭于 2013-01-09 15:05

  1         /// <summary>
  2         /// 保存图片
  3         /// </summary>
  4         void SaveData()
  5         {
  6             ThreadPool.SetMaxThreads(2, 2);
  7             string remoteImages = Request.Form["data"];
  8             if (!string.IsNullOrEmpty(remoteImages))
  9             {
 10                 string[] imgArr = remoteImages.Split(',');
 11                 if (imgArr.Length > 0)
 12                 {
 13 
 14                     ManualResetEvent[] manualEvents = new ManualResetEvent[imgArr.Length];
 15                     for (int i = 0; i < imgArr.Length; i++)
 16                     {
 17                         manualEvents[i] = new ManualResetEvent(false);
 18                         ThreadPool.QueueUserWorkItem(SaveImageToFtp, new object[] { imgArr[i], manualEvents[i] });
 19                     }
 20                     WaitHandle.WaitAll(manualEvents);
 21                 }
 22             }
 23 
 24             if (saveFilePathList.Count > 0)
 25             {
 26                 Response.Write("{\"status\":\"success\",\"data\":[");
 27                 for (int i = 0; i < saveFilePathList.Count; i++)
 28                 {
 29                     string[] arr = saveFilePathList[i];
 30                     if (i > 0)
 31                     {
 32                         Response.Write(",");
 33                     }
 34                     Response.Write("{\"originalImgSrc\":\"" + arr[0] + "\",\"nowImgSrc\":\"" + arr[1] + "\"}");
 35                 }
 36                 Response.Write("]}");
 37                 return;
 38             }
 39 
 40 
 41 
 42             Response.Write("{\"status\":\"failed\"}");
 43         }
 44 
 45 
 46         int suffixNum = 0;
 47 
 48         int GetRndNum()
 49         {
 50             suffixNum++;
 51             return suffixNum;
 52         }
 53 
 54 
 55         void SaveImageToFtp(object o)
 56         {
 57             object[] objArr = (object[])o;
 58             string imageUrl = objArr[0].ToString();
 59 
 60             ManualResetEvent mre = (ManualResetEvent)objArr[1];
 61 
 62 
 63             if (!string.IsNullOrEmpty(imageUrl))
 64             {
 65                 int dotInx = imageUrl.LastIndexOf(".");
 66                 if (dotInx > 0)
 67                 {
 68                     string path = string.Empty;
 69                     DateTime now = DateTime.Now;
 70                     string ext = imageUrl.Substring(dotInx);
 71                     string folderName = now.Year + "-" + now.Month;
 72 
 73                     string fileName = (now - (new DateTime(2000, 1, 1))).TotalMilliseconds.ToString().Replace(".", string.Empty) + GetRndNum() + ext;
 74                     path = "/" + folderName + "/" + fileName;
 75 
 76                     using (WebClient wc = new WebClient())
 77                     {
 78                         byte[] data = wc.DownloadData(imageUrl);
 79 
 80                         if (watermarkEnable)
 81                         {
 82                             data = WatermarkData(data);
 83                         }
 84 
 85 
 86                         ManualResetEvent[] manualEvents = new ManualResetEvent[ftpList.Count];
 87                         for (int i = 0; i < manualEvents.Length; i++)
 88                         {
 89                             manualEvents[i] = new ManualResetEvent(false);
 90                             ThreadPool.QueueUserWorkItem(SaveDataToFtp, new object[] { data, ftpList[i], manualEvents[i], folderName, fileName });
 91                         }
 92                         WaitHandle.WaitAll(manualEvents);
 93 
 94 
 95                         saveFilePathList.Add(new string[] { imageUrl, ImageServerDomain + path });
 96                     }
 97                 }
 98             }
 99 
100             mre.Set();
101         }
102 
103 
104 
105 
106         void SaveDataToFtp(object o)
107         {
108             object[] objArr = (object[])o;
109             byte[] data = (byte[])objArr[0];
110             string ftpUri = objArr[1].ToString();
111             ManualResetEvent mre = (ManualResetEvent)objArr[2];
112 
113             string folderName = objArr[3].ToString();
114             string fileName = objArr[4].ToString();
115 
116 
117             if (!FtpExistsFolder(ftpUri, "/", folderName))
118             {
119                 FtpCreateFolder(ftpUri, "/" + folderName + "/");
120             }
121 
122             bool success = FtpSaveFile(ftpUri, data, "/" + folderName + "/" + fileName);
123 
124             mre.Set();
125         }