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   源码介绍

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
          
    }
 
    protected void LinkButton2_Click(object sender, EventArgs e)
    { 
            string path = Server.MapPath("File/")   "DOT.GIF";
            FileInfo fi = new FileInfo(path);
            if (fi.Exists)
            {
                //Response.Clear();
                //Response.ClearHeaders();
                //Response.Buffer = true;
                //Response.AddHeader("Content-Length", fi.Length.ToString());
                //Response.ContentType = "application/application/octet-stream";
                Response.AddHeader("Content-Disposition", "attachment;filename="   HttpUtility.UrlEncode(fi.Name));
                Response.WriteFile(fi.FullName);
                //Response.End();
                //Response.Flush();
                //Response.Clear();
        
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        try
        {
            if (FileUpload1.PostedFile.FileName == "")
            {
                Label1.Text = "要上传的文件不允许为空！";
                return;
            }
            else
            {
                string filepath = FileUpload1.PostedFile.FileName;//取文件路径
                string filename = filepath.Substring(filepath.LastIndexOf("\\")   1);//取文件名
                string serverpath = Server.MapPath("File/")   filename;//合成上传路径
                FileUpload1.PostedFile.SaveAs(serverpath);//上传文件
                Label1.Text = "上传成功！";
            }
        }
        catch (Exception error)
        {
            Label1.Text = "处理发生错误！原因："   error.ToString();
        }
    }
}