.NET創建損壞的文件

Question

我正在嘗試使用.NET創建圖像。 下面是我正在使用的代碼。 在大多數情況下，這都可以正常工作，但有時我猜該流已被切斷，並且我的文件已損壞。 我正在通過其URL獲取圖像。

我真的是在尋找可以更正我的代碼或向我提供我還能做什么的見識的人。

謝謝

// 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();
        }

我收到以下錯誤：

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)

Answer 1

問題是Windows鎖定了文件。 基本上，有兩個服務器。 將文件保存在應有的另一台服務器上，一切正常。