c#上传和下载文件

Question

 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;            Response.ContentType = "application/octet-stream";
            Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);            // Read the bytes.
            while (dataToRead > 0)
            {
                // Verify that the client is connected.
                if (Response.IsClientConnected)
                {
                    // Read the data in buffer.
                    length = iStream.Read(buffer, 0, 10000);                    // Write the data to the current output stream.
                    Response.OutputStream.Write(buffer, 0, length);                    // Flush the data to the HTML output.
                    Response.Flush();                    buffer = new Byte[10000];
                    dataToRead = dataToRead - length;
                }
                else
                {
                    //prevent infinite loop if user disconnects
                    dataToRead = -1;
                }
            }
        }
        catch (Exception ex)
        {
            // Trap the error, if any.
            Response.Write("Error : " + ex.Message);
        }
        finally
        {
            if (iStream != null)
            {
                //Close the file.
                iStream.Close();
            }
        }
    }下载

Answer 1

#1楼给的不是从数据库下载，而是从本地路径下载。不过楼主居然打算直接将文件存放数据库，这种做法不知是否有必要啊。