EF 代码优先 - 列名无效

Question

我收到一个错误“列名 'FeeLevel_LevelId' 无效，考虑到所有属性都是简单类型并且此对象中没有 FeeLevel 或 LevelId 对象，这绝对没有意义。

所以我的上下文是：

  public partial class FeesDbContext : DisconnectedEntityContext
    {

        public DbSet<Currency> Currencies { get; set; }

        public DbSet<FeeLevel> FeeLevels { get; set; }

        public DbSet<FeeLevelDetail> FeeLevelDetails { get; set; }

        public DbSet<FeeType> FeeTypes { get; set; }

        public DbSet<MemberFeeDiscountLevel> MemberFeeDiscountLevels { get; set; }

        public FeesDbContext()
            : base("FeesDb") { }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Configurations.Add(new FeeLevelMap());
            modelBuilder.Configurations.Add(new FeeLevelDetailMap());
            modelBuilder.Configurations.Add(new FeeTypeMap());
            modelBuilder.Configurations.Add(new CurrencyMap());
            modelBuilder.Configurations.Add(new MemberFeeDiscountLevelMap());
        }

        public static void ApplyChanges<TEntity>(TEntity root)
                    where TEntity : class, IObjectWithState
        {
            using (var context = new FeesDbContext())
            {
                context.Set<TEntity>().Add(root);
                foreach (var entry in context.ChangeTracker.Entries<IObjectWithState>())
                {
                    IObjectWithState stateInfo = entry.Entity;
                    entry.State = ConvertState(stateInfo.State);
                }
                context.SaveChanges();
            }
        }
}

POCO 是：

public partial class MemberFeeDiscountLevel : AbstractState
    {

        public long MemberFeeDiscountLevelId { get; set; }
        public System.Guid MemberId { get; set; }
        public short MemberAsType { get; set; }
        public long FeeDiscountLevelId { get; set; }
        public System.DateTime FeeDiscountLevelAppliedDate { get; set; }
        public Nullable<System.DateTime> FeeDiscountLevelExpiresDate { get; set; }
        public Nullable<long> FallbackFeeDiscountLevelId { get; set; }
        public System.Guid UserId { get; set; }
        public System.DateTime LastModified { get; set; }


        public MemberFeeDiscountLevel(ObjectState state) : base(state) { }

        public MemberFeeDiscountLevel()
        {
        }
    }

它的映射是：

  public class MemberFeeDiscountLevelMap : EntityTypeConfiguration<MemberFeeDiscountLevel>
    {
        public MemberFeeDiscountLevelMap()
        {
            // Primary Key
            this.HasKey(t => t.MemberFeeDiscountLevelId);

            this.Ignore(t => t.State);

            // Properties
            // Table & Column Mappings
            this.ToTable("MemberFeeDiscountLevel");
            this.Property(t => t.MemberFeeDiscountLevelId).HasColumnName("MemberFeeDiscountLevelId");
            this.Property(t => t.MemberId).HasColumnName("MemberId");
            this.Property(t => t.MemberAsType).HasColumnName("MemberAsType");
            this.Property(t => t.FeeDiscountLevelId).HasColumnName("FeeDiscountLevelId");
            this.Property(t => t.FeeDiscountLevelAppliedDate).HasColumnName("FeeDiscountLevelAppliedDate");
            this.Property(t => t.FeeDiscountLevelExpiresDate).HasColumnName("FeeDiscountLevelExpiresDate");
            this.Property(t => t.FallbackFeeDiscountLevelId).HasColumnName("FallbackFeeDiscountLevelId");
            this.Property(t => t.UserId).HasColumnName("UserId");
            this.Property(t => t.LastModified).HasColumnName("LastModified");
        }
    }

数据库表是：

它没有关系。然而 EF 正在生成以下 SQL：

exec sp_executesql N'INSERT [dbo].[MemberFeeDiscountLevel]([MemberId], [MemberAsType], [FeeDiscountLevelId], [FeeDiscountLevelAppliedDate], [FeeDiscountLevelExpiresDate], [FallbackFeeDiscountLevelId], [UserId], [LastModified], [FeeLevel_LevelId])
VALUES (@0, @1, @2, @3, @4, @5, @6, @7, @8, NULL)
SELECT [MemberFeeDiscountLevelId]
FROM [dbo].[MemberFeeDiscountLevel]
WHERE @@ROWCOUNT > 0 AND [MemberFeeDiscountLevelId] = scope_identity()',N'@0 uniqueidentifier,@1 smallint,@2 bigint,@3 datetime2(7),@4 datetime2(7),@5 bigint,@6 uniqueidentifier,@7 datetime2(7),@8 int',@0='DAF771D1-079F-4743-B5C7-FD0FA1C63E19',@1=0,@2=1012,@3='2014-01-24 12:05:36.0608347',@4='2014-02-01 00:00:00',@5=1018,@6='EEDF2C83-2123-4B1C-BF8D-BE2D2FA26D09',@7='2014-01-24 12:05:36.0608347'
go

更新：

创建一个新的 Fees2DbContext 去除其他 DbSet “修复”问题....但我不知道为什么...这些类/集合都与相关类无关。

 public partial class Fees2DbContext : DisconnectedEntityContext
    {
        public DbSet<MemberFeeDiscountLevel> MemberFeeDiscountLevels { get; set; }

        public Fees2DbContext()
            : base("FeesDb") { }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Configurations.Add(new MemberFeeDiscountLevelMap());
        }

        public static void ApplyChanges<TEntity>(TEntity root)
                    where TEntity : class, IObjectWithState
        {
            using (var context = new Fees2DbContext())
            {
                context.Set<TEntity>().Add(root);
                foreach (var entry in context.ChangeTracker.Entries<IObjectWithState>())
                {
                    IObjectWithState stateInfo = entry.Entity;
                    entry.State = ConvertState(stateInfo.State);
                }
                context.SaveChanges();
            }
        }
    }

更新 2：

       public partial class FeeLevel : AbstractState
        {
            public FeeLevel()
            {
                this.FeeLevelDetails = new List<FeeLevelDetail>();
                this.MemberFeeDiscountLevels = new List<MemberFeeDiscountLevel>();
            }

            public long LevelId { get; set; }

            public string LevelName { get; set; }

            public int CurrencyId { get; set; }

            public System.DateTime LastModified { get; set; }

            public bool IsSystemOwned { get; set; }

            public System.Guid UserId { get; set; }

            public virtual Currency Currency { get; set; }

            [ScriptIgnore]
            public virtual ICollection<FeeLevelDetail> FeeLevelDetails { get; set; }

            public virtual ICollection<MemberFeeDiscountLevel> MemberFeeDiscountLevels { get; set; }
        }

public class FeeLevelMap : EntityTypeConfiguration<FeeLevel>
    {
        public FeeLevelMap()
        {
            // Primary Key
            this.HasKey(t => t.LevelId);

            this.Ignore(t => t.State);

            // Properties
            this.Property(t => t.LevelId);
            // .HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);

            this.Property(t => t.LevelName)
                .IsRequired()
                .HasMaxLength(50);

            // Table & Column Mappings
            this.ToTable("FeeLevel");
            this.Property(t => t.LevelId).HasColumnName("LevelId");
            this.Property(t => t.LevelName).HasColumnName("LevelName");
            this.Property(t => t.CurrencyId).HasColumnName("CurrencyId");
            this.Property(t => t.LastModified).HasColumnName("LastModified");
            this.Property(t => t.UserId).HasColumnName("UserId");

            // Relationships
            this.HasRequired(t => t.Currency)
                .WithMany(t => t.FeeLevels)
                .HasForeignKey(d => d.CurrencyId);

        }
    }

Answer 1

FeeLevel.MemberFeeDiscountLevels 是一个导航属性，它在FeeLevel 和MemberFeeDiscountLevel 之间引入了一对多的关系：一个FeeLevel 可以有多个MemberFeeDiscountLevels，这意味着同时一个MemberFeeDiscountLevel有一个FeeLevel。尽管MemberFeeDiscountLevel 中没有导航和外键属性，但数据库必须在MemberFeeDiscountLevel 表中具有外键才能对这种关系进行建模。 EF 假定默认 FK 名称为“相关实体名称+下划线+主键名称”=FeeLevel_LevelId。因为您的数据库表没有此列，所以您会遇到异常。