• Entity FrameWork操作数据库完成登陆、列表显示+验证码

    登陆页面
    登陆页面
    登陆页面的页面结构比较简单，没有写样式。
    image标签的作用是用来显示验证码。
    在这里插入图片描述
    一般处理程序代码展示

    using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Web;
using System.Web.SessionState;

namespace EF_lainxi.BLL
{
    /// <summary>
    /// Handler1 的摘要说明
    /// </summary>
    public class Handler1 : IHttpHandler, IRequiresSessionState
    {

        public void ProcessRequest(HttpContext context)
        {
            //颜色的集合
            Color[] colors = { Color.White };
            Image img = new Bitmap(100, 30);
            Graphics graphics = Graphics.FromImage(img);
            Random random = new Random(DateTime.Now.Millisecond);
            int charNum1 = random.Next(97, 122);
            int charNum2 = random.Next(97, 122);
            int charNum3 = random.Next(97, 122);
            int charNum4 = random.Next(97, 122);
            string validCode = string.Format($"{(char)charNum1}{(char)charNum2}{(char)charNum3}{(char)charNum4}");
            context.Session["yzm"] = validCode;
            Font font = new Font("宋体", 24);
            Brush brush1 = new SolidBrush(colors[random.Next(0, colors.Length - 1)]);
            graphics.DrawString(((char)charNum1).ToString(), font, brush1, 7, -3);
            Brush brush2 = new SolidBrush(colors[random.Next(0, colors.Length - 1)]);
            graphics.DrawString(((char)charNum2).ToString(), font, brush2, 26, -9);
            Brush brush3 = new SolidBrush(colors[random.Next(0, colors.Length - 1)]);
            graphics.DrawString(((char)charNum3).ToString(), font, brush3, 50, 0);
            Brush brush4 = new SolidBrush(colors[random.Next(0, colors.Length - 1)]);
            graphics.DrawString(((char)charNum4).ToString(), font, brush4, 70, -7);
            context.Response.ContentType = "image/jpeg";
            img.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
            graphics.Dispose();
            img.Dispose();
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

    一般处理程序中用来创建一个验证码的图片显示到页面的image里。

    页面成品展示
    在这里插入图片描述
    登陆页面代码展示

    using EF_lainxi.DAL;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

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

        protected void Button1_Click(object sender, EventArgs e)
        {
            string yzm= Session["yzm"].ToString();
            if (yzm==TextBox3.Text)
            {
                if (TextBox1.Text!=null&&TextBox1.Text!=""&&TextBox2.Text!=null&&TextBox2.Text!="")
                {
                    //数据库的名字
                    using (Model2 db=new Model2())
                    {
                        var name = db.Users.FirstOrDefault(s => s.Name == TextBox1.Text);
                        if (name.Pwd==TextBox2.Text)
                        {
                        	//跳转到显示界面
                            Response.Redirect("xians.aspx");
                        }
                        else
                        {
                            string strUrl = "<script>alert('账号或密码错误');</script>";
                            Response.Write(strUrl);
                        }
                    }

                }
                else
                {
                    string strUrl = "<script>alert('账号或密码不能为空');</script>";
                    Response.Write(strUrl);
                }
            }
            else
            {
                string strUrl = "<script>alert('验证码不正确');</script>";
                Response.Write(strUrl);
            }
        }
    }
}

    主要作用是进行了验证码的判断、账号密码的正确与否，成功跳转显示界面，错误进行提示。
    显示页面页面代码

    <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="xians.aspx.cs" Inherits="EF_lainxi.xians" %>

<!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>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.4.1/dist/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
    
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <div>
               图书名称： <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><asp:Button ID="Button1" runat="server" Text="查询"  CssClass="btn btn-link" OnClick="Button1_Click" /></div>
            <div>
                <table class="table">
                    <thead>
                        <tr>
                            <th scope="col">图书编号</th>
                            <th scope="col">图书名称</th>
                            <th scope="col">图书价格</th>
                            <th scope="col">作者</th>
                            <th scope="col">类型</th>
                            <th scope="col">图片</th>
                            <th scope="col">上架时间</th>
                            <th scope="col">操作</th>
                        </tr>
                    </thead>
                    <asp:Repeater ID="Repeater1" runat="server" OnItemCommand="Repeater1_ItemCommand">
                        <ItemTemplate>
                            <tbody>
                                <tr>
                                    <th scope="row"><%# Eval("BookId") %></th>
                                    <td><%# Eval("BookName") %></td>
                                    <td><%# Eval("Price") %></td>
                                    <td><%# Eval("BookAuthor") %></td>
                                    <td><%# Eval("TypeId.TyoeName") %></td>
                                    <td>
                                        <asp:Image ID="Image1" runat="server" ImageUrl='<%# "~/images/"+ Eval("Img") %>' Width="60" Height="60" /></td>
                                    <td><%# Eval("Addtime") %></td>
                                    <td>
                                        <asp:LinkButton ID="LinkButton1" runat="server" CommandArgument='<%# Eval("BookId") %>' CommandName="delete" OnClientClick="return confirm('确定删除吗？')">删除</asp:LinkButton>
                                        <asp:LinkButton ID="LinkButton2" runat="server" CommandArgument='<%# Eval("BookId") %>' CommandName="xainq">详情</asp:LinkButton>
                                        
                                    </td>
                                </tr>
                            </tbody>
                        </ItemTemplate>
                    </asp:Repeater>
                </table>
            </div>
        </div>
    
    </form>
       <script src="https://cdn.jsdelivr.net/npm/jquery@3.4.1/dist/jquery.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>

</body>
</html>

    显示页面后台代码

    using EF_lainxi.DAL;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace EF_lainxi
{
    public partial class xians : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                select();
            }
        }

        private void select()
        {
            using (Model2 db = new Model2())
            {
                var list = db.BookInfos.ToList();
                Repeater1.DataSource = list;
                Repeater1.DataBind();
            }
        }

        protected void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)
        {
            string pand= e.CommandName;
            int id = Convert.ToInt32(e.CommandArgument);
            if (pand== "delete")
            {
                using (Model2 db = new Model2())
                {
                    var sc= db.BookInfos.FirstOrDefault(s => s.BookId == id);
                    db.BookInfos.Remove(sc);
                    db.SaveChanges();
                    select();
                }
            }
           
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            using (Model2 db = new Model2())
            {
                Repeater1.DataSource = db.BookInfos.Where(p => p.BookName.Contains(TextBox1.Text)).ToList();
                Repeater1.DataBind();
            }
        }
    }
}

    登陆页面成品展示
    在这里插入图片描述
    注册页面代码

    在这里插入图片描述
    注册页面后台

    using EF_lainxi.DAL;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

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

        protected void Button1_Click(object sender, EventArgs e)
        {
            string yzm= Session["yzm"].ToString();
            if (yzm==TextBox3.Text)
            {
                if (TextBox1.Text!=null&&TextBox1.Text!=""&&TextBox2.Text!=null&&TextBox2.Text!="")
                {
                    using (Model2 db=new Model2())
                    {
                        var name = db.Users.FirstOrDefault(s => s.Name == TextBox1.Text);
                        if (name.Pwd==TextBox2.Text)
                        {
                            Response.Redirect("xians.aspx");
                        }
                        else
                        {
                            string strUrl = "<script>alert('账号或密码错误');</script>";
                            Response.Write(strUrl);
                        }
                    }

                }
                else
                {
                    string strUrl = "<script>alert('账号或密码不能为空');</script>";
                    Response.Write(strUrl);
                }
            }
            else
            {
                string strUrl = "<script>alert('验证码不正确');</script>";
                Response.Write(strUrl);
            }
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            Response.Redirect("tianjia.aspx");
        }
    }
}

    成功后跳转到登陆页面
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  • 原文地址：https://www.cnblogs.com/a1439775520/p/12946875.html
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