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 = "101010101010";
                sl.F_Result = true;
                sl.F_Description = "dengluchenggong";
                sl.F_CreatorUserId = "222";
                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();
        }
    }
}