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

        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();
                }
            }
        }