<summary> /// model对象 /// </summary> public class model_item : supermodel { public model_item() { type = ItemType.Normal;//枚举类型初始化 } [Required] [StringLength(16, MinimumLength = 2)] public string name { get; set; } [Required] [StringLength(16, MinimumLength = 2)] public string code { get; set; } public ItemType type { get; set; } public bool State { get; set; } public string Icon { get; set; } public long sort { get; set; } public long appid { get; set; } }

2.2为对象赋默认值【可选择】

public class DataInit : IDataInitializer<GDG_DbContext>
    {

　　　　public void Initialize(GDG_DbContext context)
       　　 {
              List<model_item> fim = new List<model_item>() { 
                new model_item(){name="郭德纲",code="gdg",type= ItemType.Normal,State=true,Icon="taoxin.png",sort=0,appid=0,reg_time=DateTime.Now},
                new model_item(){name="于谦",code="yq",type= ItemType.Normal,State=true,Icon="juanmao.png",sort=1,appid=1,reg_time=DateTime.Now},
                new model_item(){name="德云社",code="dys",type= ItemType.Normal,State=true,Icon="yun.png",sort=2,appid=2,reg_time=DateTime.Now},
           };
           fim.ForEach(o => context.fee_item.Add(o));
           context.SaveChanges();
        }
}

3.DBContext

public class GDG_DbContext : DbContext
    {
        public GDG_DbContext() : base("GDG_DbContext") { }
        public DbSet<model_item> model_item { get; set; }
       protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
         
        }
    }

4.EF Code First

4.1新增

public bool Build()
        {
            try
            {
                var context = new FeeDbContext();
                if (!context.Database.Exists())
                {
                    new List<IDataInitializer<GDG_DbContext>>() { 
                        new DataInit()
                    }.Setup<GDG_DbContext>(context);
                    return true;
                }
                return false;
            }
            catch (DbEntityValidationException ex)
            {
                StringBuilder error = new StringBuilder();
                foreach (var item in ex.EntityValidationErrors)
                {
                    foreach (var item2 in item.ValidationErrors)
                    {
                        error.Append(string.Format("{0}:{1}\r\n", item2.PropertyName, item2.ErrorMessage));
                    }
                }
                Console.WriteLine("数据库初始化报错：" + error);
                throw ex;
            }
            catch (Exception e)
            {
                Console.WriteLine("数据库初始化报错：" + e.Message);
                throw e;
            }
        }

4.2移除

public bool Remove()
        {
            var context = new GDG_DbContext();
            try
            {
                if (context.Database.Exists())
                {
                    return context.Database.Delete();
                }
                return true;
            }
            catch (Exception e)
            {
                Console.WriteLine("数据库初始化报错：" + e.Message);
                return false;
            }
            finally { context.Dispose(); }
        }

4.3初始化

public bool Rebuild()
        {
            return Remove() && Build();
        }

 

code first 创建和初始化数据库

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