为什么实体框架核心加载实体的关系而不添加包含

Question

我在 .net 核心项目中使用 EF 核心。从 ef 上下文中获取数据后，对象的实体（一对多等）将自动加载。

这是我的代码：

 public TimeSheetActivity Get(int id)
 {
     DataSets.TimeSheetActivity dbActivity = db.TimeSheetActivities
                                               .Include(k => k.ProjectFile)
                                               .Include(k => k.MeasurementUnit)
                                               .Include(k => k.TypeOfWork)
                                               .Include(k => k.TimeSheetProject)
                                               .FirstOrDefault(k => k.ID == id);

     return dbActivity == null ? null : _mapper.Map<TimeSheetActivity>(dbActivity);
 }


public Project GetActivityProject(int id)
{
    //db.SaveChanges();

    TimeSheetActivity activity = Get(id);

    if (activity == null)
    {
        return null;
    }

    var dbTimeSheetProject = db.TimeSheetProjects.First(k => k.ID == activity.TimeSheetProjectId);

    var dbProject = db.Projects.First(k => k.ID == dbTimeSheetProject.ProjectId);
    // PROBLEM HERE >> dbProject is loading all entities related
    return _mapper.Map<Project>(dbProject);
}

问题在上面标记并在Projects上下文中进行了注释，这是项目类：

public class Project
    {
        public int ID { get; set; }
        public string Title { get; set; }
        public string Description { get; set; }
        public DateTime DateAdded { get; set; }

        public int? ParentId { get; set; }
        public int? DepartmentId { get; set; }
        public int? CompanyId { get; set; }


        public virtual Department Department { get; set; }
        public virtual Company Company { get; set; }

        public virtual Project Parent { get; set; }

        public virtual List<Project> Activities { get; set; }
        public virtual List<TimeSheetProject> TimeSheetProjects { get; set; }
        public virtual List<ProjectFile> ProjectFiles { get; set; }

    }

调试捕获：

Answer 1

我认为问题是这样的（摘自文档）：

Entity Framework Core 将自动修复之前加载到上下文实例中的任何其他实体的导航属性。因此，即使您没有明确包含导航属性的数据，如果之前加载了部分或全部相关实体，该属性仍可能会被填充。

https://docs.microsoft.com/en-us/ef/core/querying/related-data#eager-loading