c#上传图片到文件夹

来源：互联网发布：雅马哈电缸软件编辑：程序博客网时间：2024/05/22 17:07

前台：

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

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

后台：

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;
using System.IO;

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

     }
     protected void Button1_Click(object sender, EventArgs e)
     {
         string photos = "..//photo";

         if (this.myFile.PostedFile != null)
         {
             string photoName1 = myFile.PostedFile.FileName; //获取初始文件名
             int i = photoName1.LastIndexOf("."); //取得文件名中最后一个"."的索引
             string newext = photoName1.Substring(i); //获取文件扩展名
             if (newext != ".gif" && newext != ".jpg" && newext != ".jpeg" && newext != ".bmp" && newext != ".zip" && newext != ".doc" && newext != ".swf")
             {
                 Response.Write("文件格式不正确!");
                 Response.End();
             }
             DateTime now = DateTime.Now; //获取系统时间
             string photoName2 = now.Millisecond.ToString() + "_" + myFile.PostedFile.ContentLength.ToString() + newext; //重新为文件命名,时间毫秒部分+文件大小+扩展名
             myFile.PostedFile.SaveAs(Server.MapPath(photos + "//" + photoName2)); // 保存文件到路径,用Server.MapPath()取当前文件的绝对目录.在asp.net里"/"必须用""代替
             Label1.Text = photos + "//" + photoName2;
         }
     }
}

注意：在Web.config文件里要加入

<httpRuntime useFullyQualifiedRedirectUrl="true" maxRequestLength="1024000" executionTimeout="900" />

否则大文件上传出错！