EF crud操作

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

namespace ConsoleAppEF
{
    class Program
    {
        static void Main(string[] args)
        {

            testEntities context = new testEntities();

            //添加实体
            //t_user t = new t_user();
            //t.username = "test";
            //t.times = DateTime.Now;

            ////添加user数据
            //context.Entry(t).State = System.Data.EntityState.Added;

            //删除实体
            //t_user user = new t_user();
            //user.id = 6;
            //数据entity数据
            //context.Entry(user).State = System.Data.EntityState.Deleted;

            //修改实体
            //t_user user = new t_user();
            //user.id = 5;
            //user.username = "ssss";

            //context.Entry(user).State = System.Data.EntityState.Modified;

            //联合插入实体
            UserInfo user = new UserInfo();
            user.username = "";
            user.times = DateTime.Now;

            context.Entry(user).State = System.Data.EntityState.Added;

            OrderInfo order = new OrderInfo();
            order.orderName = "orderName";
            //外键插入
            order.UserInfo = user;
            context.Entry(order).State = System.Data.EntityState.Added;

            context.SaveChanges();
        }
    }
}