//html页面代码
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
//asp:Image 控件
<div>
<asp:Image ID="Image1" runat="server" ImageUrl="~/Images/lmage_4.jpeg" Width="150" Height="170"/>
</div>
<div>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Label ID="lbl" runat="server" Text="Label"></asp:Label>
<asp:Button ID="Button1" runat="server" Text="上传" OnClick="Button1_Click" />
</div>
</form>
</body>
</html>
============================================================================
//后台代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Data;
using System.Data.SqlClient;
public partial class Default2 : System.Web.UI.Page
{
DBHelper dbhelper = new DBHelper();//我是用Web.config和类写的连接，这处不要复制，建议你们自己写连接
int id = 0;
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
bool bok = false;//默认为false
string path = Server.MapPath("Images");//储存文件夹路径
if(this.FileUpload1.HasFile)//检测是否有上传文件
{
string file = System.IO.Path.GetExtension(this.FileUpload1.FileName).ToLower();//获取文件夹下的文件路径
string[] allow = new string[] { ".png", ".jpg", ".gif", ".bmp", ".jpeg" };//后缀名数组
foreach(string s in allow)//读取后缀名数组
{
if (s == file) //如果符合数组里的类型
{
bok = true;//bool值为true
}
}
if (bok)//如果为true
{
try
{
this.FileUpload1.PostedFile.SaveAs(path + FileUpload1.FileName);//上传文件
this.lbl.Text = "文件" + FileUpload1.FileName + "上传成功!";
}
catch (Exception ex)
{
this.lbl.Text = "文件上传失败!" + ex.Message;
}
}
else
{
this.lbl.Text = "上传的图片格式不正确：只能上传.png,jpg,.gif,.bmp,.jpeg";
}
}
this.Image1.ImageUrl = this.Request.ApplicationPath + ("Images" + FileUpload1.FileName);//把上传的图片赋给Image1路径
}
void Update()//把上传图片路径保存到数据库中
{
dbhelper.connection.Open();
int id = Convert.ToInt32(Request.QueryString["Id"]);//获取数据库Logins表中的Id
string URL = "~/Images/" + this.FileUpload1.FileName;//文件路径名
string sql = string.Format("UPDATE Logins SET Image='{0}' WHERE Id={1}", URL, id);//SQL语句
SqlCommand command = new SqlCommand(sql, dbhelper.connection);//定义SQL执行语句
command.ExecuteNonQuery();//执行SQL语句
dbhelper.connection.Close();
command.Dispose();//释放缓存
}
}