EF默认不会加载entity所关联的entity（navigation properties），比方学生（Student）床铺（SleepIn）的地位（Location）：

Student zl = context.Students.Where(s => s.Name == "zl").Single(); Console.WriteLine(zl.SleepInId); //OK Console.WriteLine(zl.SleepIn.Location); //NullReference Exception

否则因为entity之间大量的、链式的、简单的援用关系，会导致一次性的加载大量entity，耗尽零碎内存资源。

但如果所有的关联entity要靠开发人员本人依据其Id查问获取，又显得累赘，所以EF提供了三种加载关联数据的模式：

事后（Eager）加载

关联的数据会随着entity加载同时加载。这须要用到办法：

  • Include()：蕴含以后entity的关联对象，和
  • ThenInclude()：蕴含以后entity关联对象的关联对象，通常用于关联_汇合_entity下的再一次关联。
    晚期版本的VSThenInclude()的智能提醒可能有问题，略过谬误提醒间接运行即可

    Teacher fg = context.Teachers.Where(t => t.Name == "fg") //找到Teacher .Include(t => t.Students) //蕴含Teacher的Students汇合， .ThenInclude(s => s.StudyIn) //再蕴含Student的StudyIn（Classroom） .SingleOrDefault();

如果Student不是汇合，能够始终点...比方：

Teacher fg = context.Teachers.Where(t => t.Name == "fg") .Include(t => t.Major.Bases) //Major和Bases都是entity

另外，

  • Include()能够间接并用，即一个entity下Include()多个Property，但
  • ThenInclude()不行_（编译器无奈辨别）_

所以，如果须要同时ThenClude()多个Pproperty，不能

Teacher fg = context.Teachers.Where(t => t.Name == "fg") .Include(t => t.Students) .ThenInclude(s => s.StudyIn) .ThenInclude(s => s.SleepIn)

只能：

Teacher fg = context.Teachers.Where(t => t.Name == "fg") .Include(t => t.Students) .ThenInclude(s => s.StudyIn) .Include(t => t.Students) //看似反复，但必须这样写 .ThenInclude(s => s.SleepIn)

演示：

  • F9断点，Include()之后能看到关联entity的值
  • logger，生成的SQL语句__应用JOIN，一次性获取全副数据

track和优化

  1. 一旦被加载，就会被DbContext缓存/追踪（track）
  2. 如果关联数据此前曾经被缓存/追踪，那么即便你没有Include()，一样能够被主动关联应用

    Bed bed = context.Find<Bed>(1); //实现曾经将Id=1的Bed加载到DbContext中 var query = context.Students.Where(s => s.Name == "zl") //.Include(s => s.SleepIn) 这里没有Include学生的床铺

  3. 如果最初的后果（Selcet语句）没有应用到Include()里的值，Include会被ignore

    var query = context.Students.Where(s => s.Name == "zl") .Include(s => s.SleepIn) .Select(s => new { s.Name }); //只取Student.Name，没用到Student.SleepIn

Include中能够强制转换（多态）：

.ThenInclude(t => ((Teacher)t).TeachOn) .ThenInclude(t => (t as Teacher).TeachOn)

显式（Explicit）加载

在曾经取到一个entity之后，再利用办法：

  • Entry()：获取该entity在DbContext中的追踪信息，而后调用其
    之前咱们学习过的影子属性，能够用Entry()办法获取

    context.Entry(zl).Property("EnrollDate").CurrentValue = DateTime.Now;
  • Reference()/Collection()办法，表明要获取该entity的单个的关联（Reference）或汇合（Collection）对象，最初再调用
  • Load()：将其加载

    context.Entry(zl) .Reference(s => s.StudyIn) .Load(); context.Entry(zl) .Collection(s => s.Teachers) .Load();

演示：

  • EF分两次用SQL查问别离获取entity信息
  • Load()之后EF主动赋值entity关联属性值

提早（惰性Lazy）加载

在.NET core 2.1之后反对，须要增加援用Microsoft.EntityFrameworkCore.Proxies，并显式开启：

protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) => optionsBuilder .UseLazyLoadingProxies() .UseSqlServer(myConnectionString);

所波及的entity必须是可被继承的，且关联entity属性必须是可override的（virtual）：

public class Student : Person { public virtual Bed SleepIn { get; set; } public virtual IList<Teacher> Teachers { get; set; } public virtual Classroom StudyIn { get; set; } }

因为，Lazyload实质上是：

  • 用一个独自的SQL语句获取要加载entity，比方Student
  • 其关联entity不是NULL，而是由EF主动新建的一个子类（后缀Proxy）对象，比方SleepInProxy
  • proxy对象只有主键（Id）被赋值，其余属性值为默认值（null，0，false等）
  • 然而，当开发人员视图获取关联entity时，proxy对象会主动连贯数据库，获取相干数据，予以加载

演示：

如果是关联的汇合，留神应用Query()防止全副加载：

  • studentRep.Entry(ht) .Collection(m => m.Majors) .Query().Where(m => m.MajorId > 3) .Load();

性能进步

IQueryable

按咱们之前的办法，entity援用的汇合（collection），都会一次性的把所有汇合都取出来。

如果汇合的数据量比拟大，且咱们不须要汇合的全副信息，这就是一种性能节约。比方，咱们只想取：

  • 汇合元素的个数
  • 汇合的某一部分

EF为咱们提供了

1+N问题

取出所有教室的所有学生：

foreach (var room in context.Classrooms .ToList() / 必不可少，否则会有ADO.NET的DataReader谬误 /) { Console.WriteLine(room.Name); foreach (var student in room.Students) { Console.WriteLine($" {student.Name}"); } }

因为LazyLoad，外个循环里，EF会取出所有的Classrooms，但不会取出Classroom中的Student对象；

内循环里，

补充Include()

foreach (var room in context.Classrooms.Include(c=>c.Students))

优劣总结：

  • Lazy Load：应用起来最不便，但不足精细化管制（_至多目前是这样的？_）有可能带来1+n的性能问题
  • Explicit Load：会产生屡次查问，但能够应用Query()对关联数据进行SQL语句筛选，而且能够重用
  • Eager Load：应用join查问，缩小数据库拜访次数，但不适宜关联大数据的情景（尤其是咱们实际上只须要局部关联数据的时候）

飞哥集体偏好：Lazy为主，Eager为附

为什么须要？

而不应用用query查问（Join）：保障entity不依赖于repository（database）

EF6的不同

没有ThenInclude，须要Select

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