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  • asp.net下载大文件代码

            public void Down(string filepath, HttpResponse aResponse)
            {
                System.IO.Stream iStream = null;
    
                // Buffer to read 10K bytes in chunk:
                byte[] buffer = new Byte[10000];
    
                // Length of the file:
                int length;
    
                // Total bytes to read:
                long dataToRead;
    
                // Identify the file to download including its path.
                // string filepath = "DownloadFileName";
    
                // Identify the file name.
                string filename = System.IO.Path.GetFileName(filepath);
    
                try
                {
                    // Open the file.
                    iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open,
                    System.IO.FileAccess.Read, System.IO.FileShare.Read);
    
                    // Total bytes to read:
                    dataToRead = iStream.Length;
                    aResponse.Clear();
                    aResponse.Buffer = true;
                    aResponse.Charset = "utf-8";
                    //Response.ContentType = "application/octet-stream";
                    aResponse.ContentType = "application/ms-excel";
                    aResponse.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlPathEncode(filename));
                    aResponse.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
    
                    // Read the bytes.
                    while (dataToRead > 0)
                    {
                        // Verify that the client is connected.
                        if (aResponse.IsClientConnected)
                        {
                            // Read the data in buffer.
                            length = iStream.Read(buffer, 0, 10000);
    
                            // Write the data to the current output stream.
                            aResponse.OutputStream.Write(buffer, 0, length);
    
                            // Flush the data to the HTML output.
                            aResponse.Flush();
    
                            buffer = new Byte[10000];
                            dataToRead = dataToRead - length;
                        }
                        else
                        {
                            //prevent infinite loop if user disconnects
                            dataToRead = -1;
                        }
                    }
                }
                catch (Exception ex)
                {
                    aResponse.Write("Error : " + ex.Message);
                }
                finally
                {
                    if (iStream != null)
                    {
                        iStream.Close();
                    }
                }
            }
    

    转载于:https://www.cnblogs.com/ruanzb/archive/2010/06/30/1768278.html

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  • 原文地址:https://www.cnblogs.com/twodog/p/12134784.html
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