Linq查询根据孙子的属性返回祖父母,父母和孙子 [英] Linq query to return grandparent, parent and grandchild based on a grandchild's property
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问题描述
为笨拙的标题表示歉意.我需要查询一个集合,并根据孙子的属性返回其祖父母,父母和孙子.
Apologies for the clunky title. I need to query a collection and return the grandparent, parent and grandchild based on a grandchild's property
例如,对于下面的对象,仅当条件与计划的ID匹配时,我才想获取报价,费率(父项)和计划(GrandChild).
For example with the object below, I want to get the Quote, the Rate (Parent) and the Plan (GrandChild) only if a condition matches the Plan's ID.
public class Quote
{
public int Id { get; set; }
public string Type { get; set; }
public string ParentType { get; set; }
public decimal ValueMax { get; set; }
public virtual ICollection<Rate> Rates { get; set; }
}
public class Rate
{
public int Id { get; set; }
public decimal ValueMax { get; set; }
public ICollection<Plan> Plans { get; set; }
}
public class Plan
public int Id { get; set; }
public decimal Price { get; set; }
}
推荐答案
您应该能够执行以下操作,以获取符合任何条件的计划以及其父对象和祖父母对象:
You should be able to do something like this to get the plans which meet whatever criteria, along with their parent and grandparent objects:
// results is an anonymous type with properties Quote, Rate, Plan
var results = from q in quotes
from r in q.Rates
from p in r.Plans
where p.Id < 500 /* whatever criteria */
select new
{
Quote = q,
Rate = r,
Plan = p
};
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