Entity Framework表拆分为多个实体_实用技巧

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CodeFirstTableSplit.Model
{
    /// 

    /// 缩略图类
    /// 
    public class Photograph
    {
        /// 

        /// 设置PhotoId是主键 自动增长
        /// 
        [Key]
        [DatabaseGenerated(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.Identity)]
        public int PhotoId { get; set; }

        public string Title { get; set; }

        /// 

        /// 缩略图
        /// 
        public byte[] ThumbnailBite { get; set; }

        /// 

        /// Photograph通过导航属性引用PhotographFullImage
        /// 
        [ForeignKey("PhotoId")]
        public virtual PhotographFullImage PhotographFullImage { get; set; }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CodeFirstTableSplit.Model
{
    public class PhotographFullImage
    {
        [Key]
        public int PhotoId { get; set; }

        /// 

        /// 高分辨率
        /// 
        public byte[] HighResolutionBits { get; set; }

        /// 

        /// PhotographFullImage通过导航属性引用Photograph
        /// 
        [ForeignKey("PhotoId")]
        public virtual Photograph Photograph { get; set; }
    }
}

using CodeFirstTableSplit.Model;
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CodeFirstTableSplit.DatabaseContext
{
    public class EFDbContext :DbContext
    {
        public EFDbContext()
            : base("name=Default")
        { }

        public DbSet Photographs { get; set; }

        public DbSet PhotographFullImages { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            // 设置主体
            modelBuilder.Entity().HasRequired(p => p.PhotographFullImage).WithRequiredPrincipal(t => t.Photograph);

            // 生成同一张表:设置两个实体有相同的表名
            modelBuilder.Entity().ToTable("Photograph");
            modelBuilder.Entity().ToTable("Photograph");
            base.OnModelCreating(modelBuilder);
        }


    }
}

using CodeFirstTableSplit.DatabaseContext;
using CodeFirstTableSplit.Model;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CodeFirstTableSplit
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var context = new EFDbContext())
            {
                // 写入数据
                byte[] thumbBits = new byte[100];
                byte[] fullBits = new byte[2000];
                var photo = new Photograph() { Title = "李四", ThumbnailBite = thumbBits };
                var fullImage = new PhotographFullImage() { HighResolutionBits = fullBits };

                photo.PhotographFullImage = fullImage;
                context.Photographs.Add(photo);
                // 保存
                context.SaveChanges();
            }
            Console.WriteLine("创建成功");
            Console.ReadKey();
        }
    }
}