Entity Framework Core 3.1 学习笔记5 添加

using Demo.Data;
using Demo.Domain;
using System;
using System.Linq;

namespace Demo.App
{
    class Program
    {
        static void Main(string[] args)
        {
            using var context = new DemoContext();
            //var seriA = new League()
            //{
            //    Country = "Italy",
            //    Name = "Serie A"
            //};
            //context.Leagues.Add(seriA);

            var seriB = new League()
            {
                Country = "Italy",
                Name = "Serie B"
            };
            var seriC = new League()
            {
                Country = "Italy",
                Name = "Serie C"
            };

            var seriA = context.Leagues.Single(x=>x.Name== "Serie A");
            var milan = new Club
            {
                Name = "AC Milan",
                City = "Milan",
                DateOffEstablishment = new DateTime(2020, 4, 11),
                League = seriA
            };
            context.AddRange(seriB,seriC,milan);
            var count = context.SaveChanges();


            Console.WriteLine(count);
            Console.ReadKey();
        }
    }
}