查询关联表,一级用Include二级以后用ThenInclude。 usingConsoleApp1.Data;//上下文的文件夹usingMicrosoft.EntityFrameworkCore;//ef框架using(vardb =newOAContext()) {varstu = db.Student.AsNoTracking().Include(s=>s.users).ToList();//二级三级以上往后加ThenInclude(c=>c.关联名)即可foreach(varsinstu)...
正如其他人在comments中所说的那样，您可以使用EF6 code来解析表达式并应用相关的Include/ThenInclude调用...
var blogs = context.Blogs.Include(blog => blog.Posts) .ThenInclude(post => post.Author).ToList(); 1. 2. 但是,任何技术都有两面性,优势不可能让你占完了,使用N+1 模式的优点是可以单独缓存部分数据。 跟踪与非跟踪查询 跟踪行为决定了 EF Core 是否将有关实体实例的快照信息保留在其更改跟踪器中。
varblogs = context.Blogs.Include(blog => blog.Posts) .ThenInclude(post => post.Author).ToList(); 但是,任何技术都有两面性,优势不可能让你占完了,使用N+1 模式的优点是可以单独缓存部分数据。 跟踪与非跟踪查询 跟踪行为决定了EF Core是否将有关实体实例的快照信息保留在其更改跟踪器中。如果已跟踪某...
Include -> ThenInclude on List / Collection Navigation Property accesses the List and not the item contained within hawkpgl commentedon Mar 16, 2017 hawkpglon Mar 16, 2017 Yeah I hit the same problem. I'm on VS 2017 and .Net core 1.1.1. If that intellisense gets corrected would be ...
Git stats History Files Failed to load latest commit information. Type Name Latest commit message Commit time . . Controllers DAL Infrastructure Properties Program.cs Startup.cs appsettings.Development.json appsettings.json kiwiho.Course.MultipleTenancy.EFcore.Api.csproj ©...
Internally, EF Core has a rule that a conventionally mapped owned type property can’t be null.EF Core is assuming that the owned type is available so that its properties can be read. Developers may see this as a showstopper for being able to use value objects or, ...
该API 是一个两个属性杂志类 (Id 和名称)、 杂志控制器与 EF Core DbContext 使用迁移来植入具有四个杂志的新数据库的简单。 在本系列第 2 部分中的应用程序的下一个迭代 (msdn.com/magazine/mt833438),引入了容器业务流程通过 docker-compose 文件。因为那是一种单容器解决方案,并不...
那在EntityFramework Core中是否运行上述同样代码会抛出异常,然后我们需要在连接字符串上加上此特性呢?我们来看看。 通过如上图我们知道完全不会如EntityFramework 6.x中抛出异常,这点有所不同。大部分情况下,出现如上异常或许可能是代码写的问题,不一定非得要加上 MultipleActiveResultSets=True; ...
You may want to include multiple related entities for one of the entities that is being included. For example, when queryingBlogs, you includePostsand then want to include both theAuthorandTagsof thePosts. To include both, you need to specify each include path starting at the root. For exam...