如何避免使用C＃和Entity Framework进行递归对象获取

Question

Right now, for accessing all child categories of a self joining object I am making query like this.

var productCategories = db.Categories.Inlcude("ChildCategories")
            .Inlcude("ChildCategories.ChildCategories")
            .Inlcude("ChildCategories.ChildCategories.ChildCategories")
            .Inlcude("ChildCategories.ChildCategories.ChildCategories.ChildCategories")
            .Inlcude("ChildCategories.ChildCategories.ChildCategories.ChildCategories.ChildCategories")
            .Inlcude("ChildCategories.ChildCategories.ChildCategories.ChildCategories.ChildCategories.ChildCategories")

What can be done to about this kind of query?

Answer 1

To allow the IQueryable to fetch everything (opposite of Lazy Loading), you can disable Lazy Loading on the DBContext.

 using(DBContext db = new DBContext) {
      db.ContextOptions.LaxyLoadingEnabled = false;
      // TODO: Other code here
 }

Edit: Fixed answer in response to @Slauma comment.

In the case that ChildCategory is a child class of Category (inheritance):

If you want the IQueryable to fetch everything for a ChildCategory , you can use the OfType<T>() method.

 var productCategories = db.Categories.OfType<ChildCategories>();