Question

我的EF上下文扩展包含了Mission的{{1}}实体的所有属性：

RequiredAttribute

它的工作正常。

重构它的想法 - 不仅可以使用public static IQueryable<Mission> MissionWithRequired(this IDbContext context) { return context.Missions .Include(mission => mission.Theme) .Include(mission => mission.Contact) .Include(mission => mission.Editor); }，还可以使用其他实体。

我的第一步是使用Missions阅读标有RequiredAttribute的属性。但它不起作用：

Reflection

public static IQueryable<Mission> MissionWithRequired(this IOrgDatenbankContext context) { var requiredProperties = typeof(Mission).GetProperties() .Where(property => Attribute.IsDefined(property, typeof(RequiredAttribute))); foreach (var requiredProperty in requiredProperties) { context.Missions.Include(requiredProperty.Name); } return context.Missions; }包含context但不包含Missions，Theme和Contract

Answer 1

尝试将每个包含保存到本地变量（抱歉，但我无法验证这是否有效）

public static IQueryable<Mission> MissionWithRequired(this IOrgDatenbankContext context)
{
   var requiredProperties = typeof(Mission).GetProperties()
            .Where(property => Attribute.IsDefined(property, typeof(RequiredAttribute)));

   IQueryable<Mission> result = context.Missions;
   foreach (var requiredProperty in requiredProperties)
   {
      result = result.Include(requiredProperty.Name);
   }

   return result;
}

是否可以在上下文中仅包含必需的属性？

1 个答案: