MVC ---- 增删改成 EF6

1、MVC EF6的增删改成小练习

namespace T4Demo

{

    public partial class Form1 : Form

    {

        NBEntities nb = new NBEntities();

        public Form1()

        {

            InitializeComponent();

        }

        //新增数据

        private void button1_Click(object sender, EventArgs e)

        {

            try

            {

                Sys_Log sl = new Sys_Log();

                sl.F_Id = "120321023213fd0";

                sl.F_Account = "super";

                sl.F_NickName = "超级管理员";

                sl.F_Type = "Login";

                sl.F_Date = DateTime.Now;

                sl.F_IPAddress = "192.168.1.1";

                sl.F_IPAddressName = "江苏电信";

                sl.F_ModuleName = "系统登录";

                sl.F_CreatorTime = DateTime.Now;

                sl.F_CreatorUserId = "";

                sl.F_Result = true;

                sl.F_Description = "dengluchenggong";

                sl.F_CreatorUserId = "";

                sl.F_CreatorTime = DateTime.Now;

                nb.Sys_Log.Add(sl); //内存上面的操作

                nb.SaveChanges();

            }

            catch(Exception ex) { }

        }

        //查询

        private void button2_Click(object sender, EventArgs e)

        {

            List<Sys_Log> ds = nb.Sys_Log.Where(p => p.F_Account == "super").ToList();

            this.dataGridView1.DataSource = ds;

        }

        //修改数据

        private void button3_Click(object sender, EventArgs e)

        {

            //查询要修改的数据

            //(1)单行修改

            //Sys_Log pEdit = nb.Sys_Log.Where(p=>p.F_Account== "super").FirstOrDefault();

　　　　　　　　item.F_Description = "内容被修改了";

　　　　　　　　item.F_IPAddress = "192.168.0.0";

 　　　　　　　 nb.SaveChanges();

            //(2)批量修改

            List<Sys_Log> pEdit = nb.Sys_Log.Where(p=>p.F_Account=="super").ToList();

            //保存修改

            foreach (Sys_Log item in pEdit)

            {

                item.F_Description = "内容被修改了";

                item.F_IPAddress = "192.168.0.0";

            }

            nb.SaveChanges();

        }

        //删除数据

        private void button4_Click(object sender, EventArgs e)

        {

            //(1)先查后删 根据ID删除

            Sys_Log sl = nb.Sys_Log.Where(p => p.F_Id == "1203210232100").FirstOrDefault();

            nb.Sys_Log.Remove(sl);

            nb.SaveChanges();

            //(2)自己手动添加

            Sys_Log sls = new Sys_Log() { F_Id= "120321023213fd0" };

            //附件到实体上下文

            nb.Sys_Log.Attach(sls);

            nb.Sys_Log.Remove(sls);

            nb.SaveChanges();

        }

    }

}