namespace ConsoleApp14.ModelConfig

{

   public class PersonConfig: EntityTypeConfiguration<Person>

    {

        //继承自EntityTypeConfiguration，并将Person传进来

        public PersonConfig()

        {

            this.ToTable("T_Persons");

        }

    }

}

   public class TestDbContext:DbContext

    {

        public TestDbContext():base("name=connstr")//name=connstr 表示使用连接字符串中名字为connstr的数据库

        {

        }

        public DbSet<Person> Persons { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)

        {

            base.OnModelCreating(modelBuilder);

            //用法一：从本程序集中加载所有继承自EntityTypeConfiguration类的配置

            modelBuilder.Configurations.AddFromAssembly(

                Assembly.GetExecutingAssembly());

            //用法二： 从指定的程序集中加载所有的继承自EntityTypeConfiguration类的配置

            // modelBuilder.Configurations.AddFromAssembly(

            //     Assembly.Load("ModelConfig"));

            //用法三：

            //   modelBuilder.Entity<Person>().ToTable("T_Person");

            //用法四：

           // modelBuilder.Configurations.Add(new PersonConfig());

        }

    }

            using (TestDbContext ctx = new TestDbContext())

            {

               var ps= ctx.Persons.Where(p => p.Id ==).SingleOrDefault();

                if(ps==null)

                {

                    Console.WriteLine("没有ID为3的人");

                }

                else

                {

                    ctx.Persons.Remove(ps); //单个删除

                }

             }

               var ps= ctx.Persons.Where(p => p.Id >);

                ctx.Persons.RemoveRange(ps); //批量删除