EF CTP4懒加载不玩球 [英] EF CTP4 lazy loading not playing ball

问题描述

我正在使用CTP4代码第一个EF框架，但我有懒惰加载工作的问题。阅读它，它应该很简单，但它只是不是

  public class文件夹
 {
 public int Id {get;组; } 
 public string Name {get;组; } 
 public int？ ParentFolderId {get;组; } 
 
 public virtual IList< Folder> ChildFolders {get;组; 
} 
  

在模型配置中：

  HasMany（f => f.ChildFolders）.WithOptional（）。HasConstraint（（child，folder）=> child.ParentFolderId == folder.Id）; 
  

但是，当我这样做：

 文件夹文件夹= context.Folders.SingleOrDefault（f => f.Id == 1）; 
  

folder.ChildPages是null ....但它应该是懒惰加载它...

解决方案

我发现这个答案实际上是：文件夹的空构造函数被标记为内部，虽然没有硬故障这似乎足以引起问题。

I'm using the CTP4 code first EF framework, but I'm having problems getting lazy loading to work. Reading up on it, it should be simple, but it's just not

public class Folder
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int? ParentFolderId { get; set; }

    public virtual IList<Folder> ChildFolders { get; set; }
}

In the model configuration:

HasMany(f => f.ChildFolders).WithOptional().HasConstraint((child, folder) => child.ParentFolderId == folder.Id);

However, when I do this:

Folder folder = context.Folders.SingleOrDefault(f => f.Id == 1);

folder.ChildPages is null....but it should be lazy loading it...

解决方案

I found the answer to this, actually: The empty constructor for "Folder" was marked internal, and although there were no hard failures, it seems this was enough to cause problems.

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