.ToList(); }#endregion#regionMultipleThenIncludesusing(varcontext =newBloggingContext()) {varblogs =context.Blogs .Include(blog=>blog.Posts) .ThenInclude(post=>post.Author) .ThenInclude(author=>author.Photo) .ToList(); }#endregion#regionMultipleLeafIncludesusing(varcontext =newBloggingContext()...
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...
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)...
.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。 如果已跟踪某个实体,则该实体中检测到的任何更改都会在Save...
There is no such assumption. Rather when navigation is collection, to load nav props for each collection itemThenIncludeis required. See the examples athttps://ef.readthedocs.io/en/latest/querying/related-data.html#including-multiple-levels ...
In EFCore3 Preview 7 onwards, there is a significant slow down when I have a query with many .ThenInclude()s, e.g. new WhyYouSoSlowDb(options) .Blog .Include(x => x.Posts) .ThenInclude(x => x.PostInstances) .ThenInclude(x => x.Comments) ...
EF Core 工具仅为活动提供程序提供基架迁移。 但是,有时可能想要将多个提供程序(例如 Microsoft SQL Server 和 SQLite)与 DbContext 结合使用。 通过维护多组迁移(每个提供程序一个)并针对每个模型更改添加迁移来解决该问题。使用多个上下文类型创建多个迁移集的一种方法是对每个提供程序使用一个 DbContext 类型。
The second parameter is a Boolean for the IncludeScope option. Log scopes allow you to group logs, but as far as I know, EF Core doesn’t use them. With a LoggerFactory defined, it must then be tied to a DbContext, which you can do within the OnConfiguring method....
EF Core supports splitting a single LINQ query into multiple SQL queries. In EF Core 6.0, this support has been expanded to include cases where non-navigation collections are contained in the query projection.The following are example queries showing the translation on SQL Server into either a ...
Overall, EF8 RC 2 contains all the major feature features we intend to ship in EF8, although further tweaks and bug fixes are coming for GA. These features include: Allow Multi-region or Application Preferred Regions in EF Core Cosmos ...