计算机毕业设计介绍：
7.1.2后台代码
由于系统登陆界面的前台代码相对简单，因此这里不对其前台代码进行过多介绍，仅列出系统登陆界面的后台代码，其代码如下所示：
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
using System.Web.SessionState;
public partial class Login : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.ImageButton3.ImageUrl = "image.aspx";
}
protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
{
//数据库连接字符串
string cnnstr = ConfigurationManager.ConnectionStrings["ERP之进销存销售报表ConnectionString"].ToString();
//连接并打开数据库
SqlConnection cnn = new SqlConnection(cnnstr);
cnn.Open();//打开数据库
//从数据库中提取用户名和密码
string strcmd = "select [姓名] from 系统用户表 where 用户名='" + UserName.Text + "'and 密码='" + PassWord.Text + "'";
SqlCommand cmd = new SqlCommand();
cmd.CommandText = strcmd;
cmd.CommandType = CommandType.Text;
cmd.Connection = cnn;
//如果存在用户姓名，则登陆成功。
if (cmd.ExecuteScalar() != null)
{
string strName = cmd.ExecuteScalar().ToString();
Session["TrueName"] = strName;
Session["UserName"] = this.UserName.Text.ToString().Trim();
if (CheckBox1.Checked == true)
{
HttpCookie cookie = new HttpCookie("Users");
cookie["Users"]= PassWord.Text.Trim();
cookie.Expires = DateTime.Now.AddMonths(1);
Response.Cookies.Add(cookie);
}
string aa=this.TextBox1.Text.ToString();
if (aa == Convert.ToString(Session["Image"]))
{
Response.Redirect("Index.aspx");
}
else
{
Response.Write("");
}
}
else
{
//错误提示框
Response.Write("");
}
cnn.Close(); //关闭数据库
}
protected void ImageButton2_Click(object sender, ImageClickEventArgs e)
{
Response.Redirect("~/SystemManage/Register.aspx");//转到用户注册页面
}}
〖资料来源:计算机毕业论文 www.xiaoniu168.com〗
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