如何忽略默认EntityData属性？

问题描述

我创建一个 MVC移动应用服务使用实体框架

我已经创建了一个实体模型像这样：

I have created an Entity Model like so:

public class Regions : EntityData
{
    public string Id { get; set; }

    public string Name { get; set; }
}

和我创建了一个 TableController 让我通过一个GET请求来查询：

and I have created a TableController so I query by making a get request to:

http://localhost:3000/tables/Regions

这将返回一个错误的说法：

This returns an error saying:

exceptionMessage：。无效列名'ID'\\ r \\ n无效列名>'版本'\\ r \\ n无效的列名'CreatedAt'\\ r \\ n无效列
  命名UpdatedAt'。

展望 EntityData 类，我可以看到这些都是 EntityData 类的属性：

Looking into the EntityData class I can see these are properties of the EntityData class:

   public abstract class EntityData : ITableData
    {
        protected EntityData();

        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        [Index(IsClustered = true)]
        [TableColumn(TableColumnType.CreatedAt)]
        public DateTimeOffset? CreatedAt { get; set; }
        [TableColumn(TableColumnType.Deleted)]
        public bool Deleted { get; set; }
        [Key]
        [TableColumn(TableColumnType.Id)]
        public string Id { get; set; }
        [DatabaseGenerated(DatabaseGeneratedOption.Computed)]
        [TableColumn(TableColumnType.UpdatedAt)]
        public DateTimeOffset? UpdatedAt { get; set; }
        [TableColumn(TableColumnType.Version)]
        [Timestamp]
        public byte[] Version { get; set; }
    }

所生成的查询是

'SELECT 
     [Extent1].[Id] AS [Id], 
     [Extent1].[Name] AS [Name], 
     [Extent1].[Version] AS [Version], 
     [Extent1].[CreatedAt] AS [CreatedAt], 
     [Extent1].[UpdatedAt] AS [UpdatedAt], 
     [Extent1].[Deleted] AS [Deleted]
     FROM [dbo].[Region] AS [Extent1]''

这显然是为什么查询失败。

Which is obviously why the query fails.

是否可以排除这些默认的 EntityData 列，因为它们不是在我的表地区？

Is it possible to exclude these default EntityData columns as they are not in my table Regions?

推荐答案

首先，你需要隐藏基类属性与重点新：

First you need to hide base class attributes with key new:

public new DateTimeOffset? CreatedAt { get; set; }

然后，添加属性 [NotMapped] ：

[NotMapped]
public new DateTimeOffset? CreatedAt { get; set; }

最后结果是：

public class Regions : EntityData
{
    public string Id { get; set; }

    public string Name { get; set; }

    [NotMapped]
    public new DateTimeOffset? CreatedAt { get; set; }

    [NotMapped]
    public new DateTimeOffset? UpdatedAt { get; set; }

    [NotMapped]
    public new byte[] Version { get; set; }
}

我不知道你是怎么想在这种情况下，治疗的ID。如果你需要隐藏基类属性类型之前添加新的。

I don't know how you want to treat id in this case. If you need to hide the base class property add new before type.

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