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实体框架代码优先Fluent映射

[英]Entity Framework code first Fluent mapping

我有两张桌子

  • StoreOrderItem
  • StoreOrder

现在,StoreOrder具有许多StoreOrderItems,StoreOrderItem具有一个StoreOrder(简单的一对多关系)

public class StoreOrderItemMap : EntityTypeConfiguration<StoreOrderItem>
{
        public StoreOrderItemMap()
        {
            this.ToTable("StoreOrderItem");
            this.HasKey(op => op.Id);
            this.Property(op => op.StoreOrderId).HasColumnName("order_id");
            ...

            this.HasRequired(so => so.StoreOrder)
              .WithMany(soi => soi.StoreOrderItems)
              .HasForeignKey(so => so.StoreOrderId);
        }
}

public class StoreOrderMap : EntityTypeConfiguration<StoreOrder>
{
    public StoreOrderMap()
    {
        this.ToTable("StoreOrder");
        this.HasKey(op => op.Id);
        ....
    }
}

public class StoreOrderItem
{
    ....
    public virtual int StoreOrderId { get; set; }
    ....

    public virtual StoreOrder StoreOrder { get; set; }
}

public class StoreOrder
{
    .... 
    private ICollection<StoreOrderItem> _storeOrderItems;
    ....

    public virtual ICollection<StoreOrderItem> StoreOrderItems
    {
        get { return _storeOrderItems ?? (_storeOrderItems = new List<StoreOrderItem>()); }
        set { _storeOrderItems = value; }
    }

}

//The code which is used to add the configurations to the modelBuilder.
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    System.Type configType = typeof(ContentMap);   //any of your configuration classes here
    var typesToRegister = Assembly.GetAssembly(configType).GetTypes()
        .Where(type => !String.IsNullOrEmpty(type.Namespace))
        .Where(type => type.BaseType != null && type.BaseType.IsGenericType && type.BaseType.GetGenericTypeDefinition() == typeof(EntityTypeConfiguration<>));
        foreach (var type in typesToRegister)
        {
            dynamic configurationInstance = Activator.CreateInstance(type);
            modelBuilder.Configurations.Add(configurationInstance);
        }
        base.OnModelCreating(modelBuilder);
}

注意我正在现有数据库上运行此代码,如何告诉EF不要选择“ StoreOrder_Id”,而要使用现有列“ order_id”?

这是错误:

“ /”应用程序中的服务器错误。

无效的列名“ StoreOrder_Id”。

说明:执行当前Web请求期间发生未处理的异常。 请查看堆栈跟踪,以获取有关错误及其在代码中起源的更多信息。

异常详细信息:System.Data.SqlClient.SqlException:无效的列名“ StoreOrder_Id”。

几天弯腰后才发现问题......

StoreOrder类中还有另一个属性

public virtual IList<StoreOrderItem> NonVoucherOrderItems
{
    get
    {
        return this.StoreOrderItems.Where(x => !x.IsVoucher()).ToList();
    }
}

对此评估还为时过早,并造成了各种混乱,更改为

public virtual IEnumerable<StoreOrderItem> NonVoucherOrderItems
{
    get
    {
        return this.StoreOrderItems.Where(x => !x.IsVoucher());
    }
}

它立即起作用!

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