.NET創建損壞的文件

我想用.NET創建圖像。以下是我正在使用的代碼。這在大多數情況下都能正常工作，但有時候我猜想流被切斷了，並且我有一個損壞的文件。我通過它的URL獲取圖片。.NET創建損壞的文件

我真的很想找人來糾正我的代碼，或者讓我知道我還能做些什麼。

感謝

// Function will return the number of bytes processed 
     // to the caller. Initialize to 0 here. 
     int bytesProcessed = 0; 

     // Assign values to these objects here so that they can 
     // be referenced in the finally block 
     Stream remoteStream = null; 
     Stream localStream = null; 
     WebResponse response = null; 

     // Use a try/catch/finally block as both the WebRequest and Stream 
     // classes throw exceptions upon error 
     try 
     { 
      // Create a request for the specified remote file name 
      WebRequest request = WebRequest.Create(remoteFilename); 
      if (request != null) 
      { 
       // Send the request to the server and retrieve the 
       // WebResponse object 
       response = request.GetResponse(); 
       if (response != null) 
       { 
        // Once the WebResponse object has been retrieved, 
        // get the stream object associated with the response's data 
        remoteStream = response.GetResponseStream(); 

        // Create the local file 
        localStream = File.Create(localFilename); 

        // Allocate a 1k buffer 
        byte[] buffer = new byte[1024]; 
        int bytesRead; 

        // Simple do/while loop to read from stream until 
        // no bytes are returned 
        do 
        { 
         // Read data (up to 1k) from the stream 
         bytesRead = remoteStream.Read(buffer, 0, buffer.Length); 

         // Write the data to the local file 
         localStream.Write(buffer, 0, bytesRead); 

         // Increment total bytes processed 
         bytesProcessed += bytesRead; 
        } while (bytesRead > 0); 
       } 
      } 
     } 
     catch (Exception e) 
     { 
      throw e; 
     } 
     finally 
     { 
      // Close the response and streams objects here 
      // to make sure they're closed even if an exception 
      // is thrown at some point 
      if (response != null) response.Close(); 
      if (remoteStream != null) remoteStream.Close(); 
      if (localStream != null) localStream.Close(); 
     }

，我發現了以下錯誤：

Main Exception 
MESSAGE: Parameter is not valid. 
SOURCE: System.Drawing 
TARGETSITE: System.Drawing.Image FromStream(System.IO.Stream, Boolean, Boolean) 
STACKTRACE: at System.Drawing.Image.FromStream(Stream stream, Boolean useEmbeddedColorManagement, Boolean validateImageData) 
      at Sitecore.Resources.Media.ImageMedia.GetImage() at Sitecore.Resources.Media.ImageMedia.UpdateMetaData(MediaStream mediaStream) 
      at Sitecore.Resources.Media.JpegMedia.UpdateMetaData(MediaStream mediaStream) at Sitecore.Resources.Media.MediaCreator.AttachStreamToMediaItem(Stream stream, String itemPath, String fileName, MediaCreatorOptions options) 
      at Sitecore.Resources.Media.MediaCreator.CreateFromStream(Stream stream, String filePath, MediaCreatorOptions options) 
      at Sitecore.Resources.Media.MediaCreator.CreateFromFile(String filePath, MediaCreatorOptions options)

來源

2012-04-17 Gabbar

是否有任何異常？他們說什麼？ – PaulG 2012-04-17 17:15:06

爲什麼你只捕捉一個異常，然後丟掉堆棧跟蹤？爲什麼不使用'using'語句？ – 2012-04-17 17:16:11

有時候，一箇中斷的TCP連接不會給出任何錯誤，但行爲就像流達到了末尾一樣。當我在C＃中編寫下載程序時，我下載到一個臨時文件，並且只有在驗證預期的大小（來自http標頭）與下載的大小匹配後纔將其移至目標文件名。 – CodesInChaos 2012-04-17 17:29:25

的問題是與該文件由Windows被鎖定。基本上，有兩臺服務器。將文件保存在應該已經存在的另一臺服務器上，並且一切正常。

來源

2012-07-27 19:37:02 Gabbar

.NET創建損壞的文件

回答

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