內部異常捕獲問題asp.net

public static void Download() { int count = 0; try { HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://img.bimg.126.net/photo/c7bckFJxdJxSwQLIy76HTQ==/1755840904721658663.jpg"); using (HttpWebResponse response = (HttpWebResponse)request.GetResponse()) { byte[] buffer = new byte[64]; string temppath = "g://1755840904721658663.jpg"; using (System.IO.Stream downloadStream = response.GetResponseStream()) { using (FileStream saveFileStream = new FileStream(temppath, FileMode.Create, FileAccess.Write, FileShare.None)) { int readSize = 0; while (true) { readSize = downloadStream.Read(buffer, 0, buffer.Length); if (readSize <= 0) break; saveFileStream.Write(buffer, 0, readSize); } Console.WriteLine("彈出"); } } } } catch (System.Net.Sockets.SocketException ex) { Console.WriteLine("網絡中斷"); } catch (Exception ex) { //throw ex; Console.WriteLine("異常類型：{0}", ex.GetType()); Console.WriteLine("異常信息：{0}", ex.Message); Console.WriteLine("異常來源：{0}", ex.Source); Console.WriteLine("異常堆棧：{0}", ex.StackTrace); Console.WriteLine("內部異常：{0}", ex.InnerException); } }  

 

異常類型：System.IO.IOException
異常信息：無法從傳輸連接中讀取數據: 遠程主機強迫關閉了一個現有的連接。。
內部異常：System.Net.Sockets.SocketException (0x80004005): 遠程主機強迫關閉了一
個現有的連接。
  在 System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size,
 SocketFlags socketFlags)
  在 System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 s
ize)

 

 

 

IOException.InnerException是因爲在讀取Stream過程中，網絡中斷導致。

所以代碼中應該加上一個Catch IOException的處理。

... catch(IOException ex) { if(IOException.InnerException is System.Net.Sockets.SocketException) Console.WriteLine("網絡中斷"); else Console.WriteLine(ex.Message); } ...