实体框架检查属性是否是导航属性 [英] entity framework check if property is navigation property

问题描述

有没有办法查看实体的属性是否是导航属性？

Is there any way to see if property of an entity is navigation property, from its metadata?

我可以通过检查实现属性来确定属性是否是实体集合ICOLlection，从那里我可以得出结论，如果它是导航属性。

I can determine if property is entity collection by inspecting if it implements ICollection and from there i can conclude if it is navigation property.

但是，如果属性不是实体集合，而只是引用另一个实体呢？

But what about if property is not entity collection but only reference to another entity?

推荐答案

您可以从MetdataWorkspace获取O-Space EDM实体类型，并具有NavigationProperties属性。这是一个例子：

You can get the O-Space EDM entity type from MetdataWorkspace and it has NavigationProperties property. Here is an example:

var workspace = ((IObjectContextAdapter) ctx).ObjectContext.MetadataWorkspace;
var itemCollection = (ObjectItemCollection)(workspace.GetItemCollection(DataSpace.OSpace));
var entityType = itemCollection.OfType<EntityType>().Single(e => itemCollection.GetClrType(e) == typeof(MyEntity));
foreach(var navigationProperty in entityType.NavigationProperties)
{
    Console.WriteLine(navigationProperty.Name);
}

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