简单的文件上传

来源：互联网发布：淘宝课程ppt 编辑：程序博客网时间：2024/05/22 17:02

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="1.aspx.cs" Inherits="_1" %>

1.aspx

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

1.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;

public partial class _1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

    }
    protected string rndfilename()
    { //随机文件名
        string RndStr,filename1;
        Random rnd=new Random();
        RndStr="0123456789abcdefghijklmnopqrstuvwxyz";//循环文件名的字母和数字
        filename1=DateTime.Now.ToString("yyyyMMddhhmmss");
        for(int i=1;i<=4;i++)
        {//随机数的位数
            filename1 += RndStr[rnd.Next(0, 36)];
        }
        return filename1;
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (FileUpload1.HasFile)
        {
            string filetype;
            int filesize;
            filetype = FileUpload1.PostedFile.ContentType.ToLower();
            if (filetype != "image/gif" && filetype != "image/pjpeg" && filetype != "image/x-png" && filetype != "image/bmp")
            {
                Response.Write("<script>alert('只允许上传jpg,gif,png类型的图片');history.go(-1)</script>");
            }
            else if (FileUpload1.PostedFile.ContentLength > 202400)
            {
                Response.Write("<script>alert('上传文件的大小请控制在200KB以内');history.go(-1)</script>");
            }
            else
            {
                String savePath = Server.MapPath("Uploadfile/");
                savePath += rndfilename();
                savePath += FileUpload1.FileName;
                FileUpload1.SaveAs(savePath);//保存文件
            }
        }
    }
}