PEIS_WinForm/PEIS/Helper/EntityFrameworkTemplate.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using PEIS.Model;

namespace PEIS.Helper
{
    class EntityFrameworkTemplate
    {
        private readonly lisdbEntities _db = new lisdbEntities();
        public void Add()
        {
            _db.Dict_User.Add(new Dict_User()
            {
                UserName = "李进才",
                Password = "test"
            });
            _db.SaveChanges();
        }
        public void Remove()
        {
            _db.Dict_User.RemoveRange(_db.Dict_User.Where(p => p.UserCode == "0001"));
            _db.SaveChanges();
        }
        public void Edit()
        {
            var user = _db.Dict_User.Find("0001");
            // 只能逐个赋值，不能直接赋值对象，除非写个方法类循环逐个赋值
            user.UserName = "修改名字";
            _db.SaveChanges();
        }
        public Dict_User SelectForId()
        {
            return _db.Dict_User.Find("0001");
        }

        public Dict_User SelectForOther()
        {
            return _db.Dict_User.FirstOrDefault(p=>p.UserName=="管理员");
        }

        public List<Dict_User> SelectToList()
        {
            return _db.Dict_User.Where(p => p.UserName == "0001" || p.UserName == "管理员").ToList();
        }
    }
}