上传下载/FileDown.cs

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

namespace DotNet.Utilities
{
    /// <summary>
    /// 文件下载类
    /// </summary>
    public class FileDown
    {
        public FileDown()
        { }

        /// <summary>
        /// 参数为虚拟路径
        /// </summary>
        public static string FileNameExtension(string FileName)
        {
            return Path.GetExtension(MapPathFile(FileName));
        }

        /// <summary>
        /// 获取物理地址
        /// </summary>
        public static string MapPathFile(string FileName)
        {
            return HttpContext.Current.Server.MapPath(FileName);
        }

        /// <summary>
        /// 普通下载
        /// </summary>
        /// <param name="FileName">文件虚拟路径</param>
        public static void DownLoadold(string FileName)
        {
            string destFileName = MapPathFile(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(Path.GetFileName(destFileName), 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();
            }
        }

        /// <summary>
        /// 分块下载
        /// </summary>
        /// <param name="FileName">文件虚拟路径</param>
        public static void DownLoad(string FileName)
        {
            string filePath = MapPathFile(FileName);