如何为继承的泛型类型创建实体数据模型？ [英] How to create an Entity Data Model for inherited generic types?

问题描述

我不知道我如何可以使用实体框架（EF是一个约束，我必须使用它），基于以下类（简化）获取现有的对象结构。

  public abstract class WahWahProperty 
 {
 public string Name {get;组; } 
 public abstract Type PropertyType {get; } 
} 
 
 // ---------------- 
 
 public class WahWahProperty< T> ：WahWahProperty 
 {
 public T Value {get;组; 
 
 public override类型PropertyType 
 {
 get {return typeof（T）; } 
} 
} 
 
 // ---------------- 
 
 public class WahWahContainer 
 {
 public List< WahWahContainer>孩子{get {...}; } 
 public List< WahWahContainer>父母{get {...}; } // multipleParentsallowed 
 public List< WahWahProperty>属性{get {...}; } 
 // ...这里有更多的道具... 
} 
  

任何想法？

解决方案

EF不支持通用实体类型（这似乎是您正在做的） / p>

尽管我们在EF 4.0中进行了更改（不是在Beta1中），因此您将能够使用从泛型类派生的非泛型类作为实体。 / p>

无论如何希望这有助于

Alex

程序实体框架团队

实体框架提示

I have no clue how i can get an existing object structure based on the following classes (simplified) into a database using Entity Framework (EF is a constraint, i have to use it).

public abstract class WahWahProperty
{
  public string Name { get; set; }
  public abstract Type PropertyType { get; }
}

// ----------------

public class WahWahProperty<T> : WahWahProperty
{
  public T Value { get; set; }

  public override Type PropertyType
  {
    get { return typeof(T); }
  }
}

// ----------------

public class WahWahContainer
{
  public List<WahWahContainer> Children { get {...}; }
  public List<WahWahContainer> Parents { get {...}; } // multiple "Parents" allowed
  public List<WahWahProperty> Properties { get {...}; }
  //... some more props here ...
}

Any ideas?

解决方案

The EF doesn't support generic Entity types (which seems to be what you are doing).

Although we have made a change in EF 4.0 (not in Beta1) so you will be able to use a non-generic class derived from a generic class as an Entity.

Anyway hope this helps

Alex

Program Manager Entity Framework Team

Entity Framework Tips

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