学步园

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       // string datastr=FileToData(Server.MapPath("neteaselogo.gif"));
       
      // DataToFile(datastr,Server.MapPath("logo.gif"));
        upfile();
       
    }
    public static string FileToData(string path)
    {
        if (File.Exists(path))
        {
            FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
            int fileLenght = Convert.ToInt32(fs.Length);
            byte[] bytes = new byte[fileLenght];
            BinaryReader br = new BinaryReader(fs);
            for (int i = 0; i <= fileLenght; i++)
            {
                br.Read(bytes, 0, fileLenght);
            }
            string strdata = Convert.ToBase64String(bytes);
            fs.Close();
            br.Close();
            return strdata;
        }
        return null;
    }
    public void DataToFile(string strdata, string path)
    {
        FileStream fs = new FileStream(path, FileMode.Create, FileAccess.Write);
        BinaryWriter bw = new BinaryWriter(fs);
        bw.Write(Convert.FromBase64String(strdata));       
        Response.OutputStream.Write(Convert.FromBase64String(strdata), 0, strdata.Length);
        bw.Close();
        fs.Close();
    }
    public void upfile()
    {
        System.IO.Stream iStream = null;

        // Buffer to read 10K bytes in chunk:
        byte[] buffer = new Byte[10240];

        // Length of the file:
        int length;

        // Total bytes to read:
        long dataToRead;

        // Identify the file to download including its path.
        string filepath = @"E:软件办公sql2005sql2005_one.iso";

        // Identify the file name.
        string filename = System.IO.Path.GetFileName(filepath);

        try
        {
            // Open the file.
            iStream = new FileStream(filepath, System.IO.FileMode.Open,
              FileAccess.Read, FileShare.Read);          
            Response.Clear();

            // Total bytes to read:
            dataToRead = iStream.Length;

            long p = 0;
            if (Request.Headers["Range"] != null)
            {
                Response.StatusCode = 206;
                p = long.Parse(Request.Headers["Range"].Replace("bytes=", "").Replace("-", ""));
            }
            if (p != 0)
            {
                Response.AddHeader("Content-Range", "bytes " + p.ToString() + "-" + ((long)(dataToRead - 1)).ToString() + "/" + dataToRead.ToString());
            }
            Response.AddHeader("Content-Length", ((long)(dataToRead - p)).ToString());
            Response.ContentType = "application/octet-stream";
            Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(Request.ContentEncoding.GetBytes(filename)));

            iStream.Position = p;
            dataToRead = dataToRead - p;
            // 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, 10240);

                    // 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[10240];
                    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();
            }
            Response.End();
        }
    }
}