Question

我是Field实体，我正在寻找一种方法来加载所有嵌套字段树，而无需多个DB查询。我听说过关于这个问题Most efficient method of self referencing tree using Entity Framework的封闭表的解决方案但我不确定它是最简单的方法（实际上我不知道如何填充闭包表并在查询后映射结果）

而不是我想通过CommonId加载所有字段，但我不会通过导航属性从缓存加载数据。

public class Field
{
        public int Id { get; s; };

        public CommonId{ get; set;} //each field from FieldDetails has same value

        [ForeignKey("ParentField")]
        public int? ParentFieldId { get; set; }
        public virtual Field ParentField {get;set;} 

        public virtual ICollection<Field> FieldDetails { get; set; } =
            new List<Field>();
}


var allFields = Context.Fields.where(f=>f.CommonId == 1).ToList(); //load all fields in memory cache
Field root =  Context.Fields.Find(1);
foreach (var f in root.FieldDetails)
{
   foreach (var f2 in f.FieldDetails)  // should be loaded from cache instead of DataBase Query
   {
     ... 
   }
}

实体框架从缓存加载导航属性

0 个答案: