Question

我有两张桌子

StoreOrderItem
StoreOrder

现在，StoreOrder有许多StoreOrderItems，StoreOrderItem有一个StoreOrder（简单的1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);
}

注意我在现有数据库上运行此代码，如何告诉EF不选择“StoreOrder_Id”并改为使用现有列“order_id”？

这是错误：

应用程序中的服务器错误。

列名称'StoreOrder_Id'无效。

描述：执行期间发生了未处理的异常   当前的网络请求。请查看堆栈跟踪了解更多信息   有关错误的信息以及它在代码中的起源。

异常详细信息：System.Data.SqlClient.SqlException：无效列   名称'StoreOrder_Id'。

Answer 1

经过几天心灵弯曲后发现问题......

StoreOrder类中有另一个属性

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

过早评估这种情况并造成各种混乱，改为

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

它立即起作用了！

实体框架代码首先是Fluent映射

1 个答案: