ASP.net 网站开发知识点总结

一、常用技术概括及介绍

1. SQL server：处理数据库的设计
2. asp.net 
3. html            ：前端网页
4. css 　　　 ：网页的布局设计
5. JavaScript  ：能够更好的操作页面
6. jQuery        ：
7. ajax　　　　:处理局部刷新请求

二、分层介绍 （类库）
1.bll：业务层、
2.dal:数据层、
3.model：对应数据库的表、
4.common：公共方法
5.webapp：新建的app

6.webapp自带的配置文件

创建好之后如下：

三、实现步骤
1. 数据层中两个类，对应封装增删改查语句

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.SqlClient;
namespace CZBK.ItcastProject.DAL
{
   public class SqlHelper
    {
        //getdatetable方法获取整个表     //参数1.sql语句  2. 判断是sql语句还是存储过程 3. 传递的参数
       private static readonly string connStr = ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;  //读取配置文件中的字符串
       public static DataTable GetDataTable(string sql,CommandType type,params SqlParameter[]pars)
       {    
           using (SqlConnection conn = new SqlConnection(connStr))
           {   
               using (SqlDataAdapter apter = new SqlDataAdapter(sql, conn))
               {
                   if (pars != null)
                   {
                       apter.SelectCommand.Parameters.AddRange(pars);
                   }
                   apter.SelectCommand.CommandType = type;
                   DataTable da = new DataTable();
                   apter.Fill(da);
                   return da;
               }
           }
       }
       //获取受影响行数，ExecuteNonQuery 主要用在插入,更新,删除 一般情况用在查询的时候返回的是-1 
       public static int ExecuteNonquery(string sql, CommandType type, params SqlParameter[] pars)
       {
　　　　　　
           using (SqlConnection conn = new SqlConnection(connStr))
           {
               using (SqlCommand cmd = new SqlCommand(sql, conn))
               {
                   if (pars != null)
                   {
                       cmd.Parameters.AddRange(pars);
                   }
                   cmd.CommandType = type;
                   conn.Open();
                   return cmd.ExecuteNonQuery();
               }
           }
       }
    }
}

using CZBK.ItcastProject.Model;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.SqlClient;
namespace CZBK.ItcastProject.DAL
{
    public class UserInfoDal
    {
        /// <summary>
        /// 获取用户列表
        /// </summary>
        /// <returns></returns>
        public List<UserInfo> GetList()
        {
            string sql = "select * from UserInfo";
            DataTable da = SqlHelper.GetDataTable(sql, CommandType.Text);
            List<UserInfo> list = null;
            if (da.Rows.Count > 0)
            {
                list = new List<UserInfo>();
                UserInfo userInfo = null;
                foreach (DataRow row in da.Rows)
                {
                    userInfo = new UserInfo();
                    LoadEntity(userInfo, row);
                    list.Add(userInfo);
                }
            }
            return list;
        }
        /// <summary>
        /// 添加用户信息
        /// </summary>
        /// <param name="userInfo"></param>
        /// <returns></returns>
        public int AddUserInfo(UserInfo userInfo)
        {
            string sql = "insert into UserInfo(UserName,UserPass,RegTime,Email) values(@UserName,@UserPass,@RegTime,@Email)";
            SqlParameter[] pars = { 
                                new SqlParameter("@UserName",SqlDbType.NVarChar,32),
                                  new SqlParameter("@UserPass",SqlDbType.NVarChar,32),
                                         new SqlParameter("@RegTime",SqlDbType.DateTime),
                                    new SqlParameter("@Email",SqlDbType.NVarChar,32)
                                };
            pars[0].Value = userInfo.UserName;
            pars[1].Value = userInfo.UserPass;
            pars[2].Value = userInfo.RegTime;
            pars[3].Value = userInfo.Email;
            return SqlHelper.ExecuteNonquery(sql, CommandType.Text, pars);
        }

        /// <summary>
        /// 根据ID删除用户的信息
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public int DeleteUserInfo(int id)
        {
            string sql = "delete  from UserInfo where ID=@ID";
            SqlParameter[] pars = { 
                                  new SqlParameter("@ID",SqlDbType.Int)
                                  };
            pars[0].Value = id;
            return SqlHelper.ExecuteNonquery(sql,CommandType.Text,pars);
        }

        /// <summary>
        /// 修改用户信息
        /// </summary>
        /// <param name="userInfo"></param>
        /// <returns></returns>
        public int EditUserInfo(UserInfo userInfo)
        {
            string sql = "update UserInfo set UserName=@UserName,UserPass=@UserPass,RegTime=@RegTime,Email=@Email where ID=@ID";
            SqlParameter[] pars = { 
                                new SqlParameter("@UserName",SqlDbType.NVarChar,32),
                                  new SqlParameter("@UserPass",SqlDbType.NVarChar,32),
                                         new SqlParameter("@RegTime",SqlDbType.DateTime),
                                    new SqlParameter("@Email",SqlDbType.NVarChar,32),
                                    new SqlParameter("@ID",SqlDbType.Int)
                                };
            pars[0].Value = userInfo.UserName;
            pars[1].Value = userInfo.UserPass;
            pars[2].Value = userInfo.RegTime;
            pars[3].Value = userInfo.Email;
            pars[4].Value = userInfo.Id;
            return SqlHelper.ExecuteNonquery(sql, CommandType.Text, pars);
        }

        /// <summary>
        /// 根据用户的编号，获取用户的信息
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public UserInfo GetUserInfo(int id)
        {
            string sql = "select * from UserInfo where ID=@ID";
            SqlParameter[] pars = { 
                                  new SqlParameter("@ID",SqlDbType.Int)
                                  };
            pars[0].Value = id;
            DataTable da=SqlHelper.GetDataTable(sql, CommandType.Text, pars);
            UserInfo userInfo = null;
            if (da.Rows.Count > 0)
            {
                userInfo = new UserInfo();
                LoadEntity(userInfo, da.Rows[0]);
            }
            return userInfo;
        }
 

        private void LoadEntity(UserInfo userInfo, DataRow row)
        {
            userInfo.UserName = row["UserName"] != DBNull.Value ? row["UserName"].ToString() : string.Empty;
            userInfo.UserPass = row["UserPass"] != DBNull.Value ? row["UserPass"].ToString() : string.Empty;
            userInfo.Email = row["Email"] != DBNull.Value ? row["Email"].ToString() : string.Empty;
            userInfo.Id = Convert.ToInt32(row["ID"]);
            userInfo.RegTime = Convert.ToDateTime(row["RegTime"]);
        }
    }
}

 model层中添加与列相同的表字段。示例代码如下

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CZBK.ItcastProject.Model
{
   public class UserInfo
    {
       public int Id { get; set; }
       public string UserName { get; set; }
       public string UserPass { get; set; }
       public DateTime RegTime { get; set; }
       public string Email { get; set; }
    }
}

2. 业务层中写一个调用对象方法的方法

using CZBK.ItcastProject.Model;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using CZBK.ItcastProject.DAL;
namespace CZBK.ItcastProject.BLL
{
   public class UserInfoService
    {
      UserInfoDal UserInfoDal = new UserInfoDal();
       /// <summary>
       /// 返回数据列表
       /// </summary>
       /// <returns></returns>
       public List<UserInfo> GetList()
       {
           return UserInfoDal.GetList();
       }
       /// <summary>
       /// 添加数据
       /// </summary>
       /// <param name="userInfo"></param>
       /// <returns></returns>
       public bool AddUserInfo(UserInfo userInfo)
       {
           return UserInfoDal.AddUserInfo(userInfo)>0;
       }
        /// <summary>
        /// 根据ID删除用户的信息
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
       public bool DeleteUserInfo(int id)
       {
           return UserInfoDal.DeleteUserInfo(id) > 0;
       }
       /// <summary>
       /// 修改用户信息
       /// </summary>
       /// <param name="userInfo"></param>
       /// <returns></returns>
       public bool EditUserInfo(UserInfo userInfo)
       {
           return UserInfoDal.EditUserInfo(userInfo) > 0;
       }
       /// <summary>
        /// 根据用户的编号，获取用户的信息
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
       public UserInfo GetUserInfo(int id)
       {
           return UserInfoDal.GetUserInfo(id);
       }
        
    }
}

3. 新建一个html页面，

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
    <link href="Css/tableStyle.css" rel="stylesheet" />
    <script src="Js/jquery-1.7.1.js"></script>
    <script type="text/javascript">
        $(function () {
            $(".deletes").click(function () {
                if (!confirm("确定要删除吗?")) {
                    return false;
                }
            });
        });
    </script>
</head>
    
<body>
    <a href="AddUserInfo.html">添加</a>
    <table>
        <tr><th>编号</th><th>用户名</th><th>密码</th><th>邮箱</th><th>时间</th><th>删除</th><th>详细</th><th>编辑</th></tr>
       @tbody

    </table>
</body>
</html>

4. 新建一个一般处理程序

using CZBK.ItcastProject.Model;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Web;

namespace CZBK.ItcastProject.WebApp
{
    /// <summary>
    /// UserInfoList 的摘要说明
    /// </summary>
    public class UserInfoList : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/html";
            //new一个业务层的类库对象
            BLL.UserInfoService UserInfoService = new BLL.UserInfoService();
            //调用获取全部列表的方法
           List<UserInfo> list= UserInfoService.GetList();
            //快捷操作字符串的方法
           StringBuilder sb = new StringBuilder();
            //将遍历到的数据拼接成一个新的字符串
           foreach (UserInfo userInfo in list)
           {
               sb.AppendFormat("<tr><td>{0}</td><td>{1}</td><td>{2}</td><td>{3}</td><td>{4}</td><td><a href='DeleteUser.ashx?id={0}' class='deletes'>删除</a></td><td><a href='ShowDetail.ashx?uid={0}'>详细</a></td><td><a href='ShowEdit.ashx?id={0}'>编辑</a></td></tr>",userInfo.Id,userInfo.UserName,userInfo.UserPass,userInfo.Email,userInfo.RegTime);
           }
            //读取模板文件的路径
           string filePath = context.Request.MapPath("UserInfoList.html");
            //读取其中全部的字节
           string fileCotent = File.ReadAllText(filePath);
            //替换字符串
           fileCotent = fileCotent.Replace("@tbody",sb.ToString());
           context.Response.Write(fileCotent);
        }

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