code/Athena0.0.1/tool/File/FileDownHelper.cs

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using System;
using System.IO;
using System.Threading;
using System.Web;

namespace Athena.tool.Code
{
    public class FileDownHelper
    {
        public FileDownHelper()
        { }
        public static string FileNameExtension(string FileName)
        {
            return Path.GetExtension(MapPathFile(FileName));
        }
        public static string MapPathFile(string FileName)
        {
            return HttpContext.Current.Server.MapPath(FileName);
        }
        public static bool FileExists(string FileName)
        {
            string destFileName = FileName;
            if (File.Exists(destFileName))
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        public static void DownLoadold(string FileName, string name)
        {
            string destFileName = FileName;
            if (File.Exists(destFileName))
            {
                FileInfo fi = new FileInfo(destFileName);
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.ClearHeaders();
                HttpContext.Current.Response.Buffer = false;
                HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(name, System.Text.Encoding.UTF8));
                HttpContext.Current.Response.AppendHeader("Content-Length", fi.Length.ToString());
                HttpContext.Current.Response.ContentType = "application/octet-stream";
                HttpContext.Current.Response.WriteFile(destFileName);
                HttpContext.Current.Response.Flush();
                HttpContext.Current.Response.End();
            }
        }
        public static void DownLoad(string FileName)
        {
            string filePath = MapPathFile(FileName);
            long chunkSize = 204800;             //指定块大小 
            byte[] buffer = new byte[chunkSize]; //建立一个200K的缓冲区 
            long dataToRead = 0;                 //已读的字节数   
            FileStream stream = null;
            try
            {
                //打开文件   
                stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
                dataToRead = stream.Length;