Ef core theninclude select. But I don't know if that's what you actually need .

Ef core theninclude select. If you wish to include additional types based on the navigation properties of the type being included, then chain a call to ThenInclude&lt;TEntity,TPreviousProperty,TProperty&gt;(IIncludableQueryable&lt;TEntity, IEnumerable&lt Mar 18, 2018 · EF Core - Select on Include and ThenInclude Asked 7 years, 6 months ago Modified 7 years, 6 months ago Viewed 643 times Sep 12, 2023 · Entity Framework Core 会根据之前已加载到上下文实例中的实体自动填充导航属性。 因此，即使不显式包含导航属性的数据，如果先前加载了部分或所有关联实体，则仍可能填充该属性。 Data querying in EF Core is performed against the DbSet properties of the DbContext. Dear community, I have a problem regarding loading a deeply nested hierarchy of entities. It helps improve performance by reducing database round-trip use. Fields. include(y => y. Parent. Include(a => a. Então, mesmo se você não incluir de forma explícita os dados para a propriedade de navegação, a propriedade ainda pode ser populada se algumas ou todas as entidades relacionadas foram carregadas anteriormente. I'm trying to filter based on a property on one of the includes. Learn about the cause that can make the Include method slow and how to improve the performance. Include (ie => ie. Set<Product>() . ThenInclude() to continue accessing the associated property. It allows us to filter and sort results of navigation properties The question is . LINQ queries can be written using query Apr 28, 2020 · SelectMany in Entity Framework Core flattens out the collection of collections into single collection of objects. Here's how it happened… 我需要在ThenInclude中使用where。var templatesFields = await _context. EF Core Include / ThenInclude totally replace the need of Select / SelectMany used in EF6. The way to avoid it is to avoid using . There's no way to deal with B 's beyond the first call to . Include(child). But I don't know if that's what you actually need c# entity-framework entity-framework-core asked Jun 7, 2017 at 20:02 Palmi 2,541 5 32 71 Aug 26, 2021 · The number of 'reads' in SQL Server can be really high I believe that EF Core could improve the performance by avoiding some LEFT JOINs. Apr 2, 2013 · In EF. Where (t=>t. That's why you can't chain them like x. EntityFrameworkCore. e. StudentID=sd. Select inside . So the ! (null-forgiving) operator can be used to silence the warning as in Where(g => g. C)), however it looks a bit unnatural, hence EF Core introduced the "more intuitive" ThenInclude. So I used a new EF Core feature called Query Splitting to significantly improve my performance. ModelA. Also please note that EF Core processes collection includes differently (does not use single query as in . Jun 18, 2025 · Brief Overview: Our EF Core queries were slow, really slow. This is the query: var titlesOwnedByUser = context. Orders. When working with **Entity Framework Core (EF Core),** there are different strategies for loading related data from the database. We need to supply the navigational property of the related entity as the argument. 0 has been a breakthrough, offering a new approach to handling complex queries. SelectMany(x => x Apr 30, 2019 · How do i get specific columns from a thenInclude using . How can I optimize that? Jul 24, 2021 · むしゃくしゃしたので若干深夜テンション込みで書き殴り。 とっちらかってるし見落しとか何とかいろいろあるはず。 結論 ・データ取得時 (特に編集をしない場合) はAsNoTracking()を呼んでおく ・ThenInclude()は可能であれば使わない ・使う必要がある場 Jul 8, 2015 · Entity Framework with Include and Select together Asked 10 years, 1 month ago Modified 5 years, 5 months ago Viewed 37k times Jan 16, 2017 · When using Entity Framework Core (v1. Bs. The solution was to set the BookingId column to null on the sub line items to ensure that their only relationship is to their parent line item. Of course, I could do: return dbContext. I have nested include leafs off a model. What i Apr 5, 2018 · . Include() changed everything. include (P => Child. Learn how to efficiently load child entities in your data models, optimizing performance and simplifying queries. 0 and have this 2 classes: News public class News { public int Id { get; set; } public string Title{ get; set; } public string Text { get; set; } public Entity Framework Classic ThenInclude Description You can chain multiple related objects to the query result by using the AlsoInclude and ThenInclude methods. Courses. offices. 1 to many with the original 'subject'), EF Core has a new extension method, . The relation is defined in the DbContext's model. You're missing some important information in your question - what are you actually trying to query? context. So, If you don't need all of them and you want to load data for properties only when they are called then Truy vấn trong Entity Framework Core Truy vấn trong Entity Framework Core vẫn giống như truy vấn trong Entity Framework 6. It compiles (with a local copy of IIncludableQueryable from EF. Sections . Learn how joining multiple entities can help to improve your performance. Core), but it is not tested. Chapters)), specifically the . PupilsTests)) is . Jan 25, 2024 · Translating LINQ queries into single and split SQL queries with Entity Framework Core Jan 6, 2022 · The . I have 2 entities for distinct set of attributes. Include() in Entity Framework Core seems helpful… until your app scales and queries slow to a crawl. The query I was running was constantly timing out. In EF Core you have to use "ThenInclude". Improve app performance by loading related data only when it’s actually needed. In the "ThenInclude" how to we populate each array items objects? -- No Exception, outside of NULL REF -- Further technical details EF Core version: 1. Examples of query specification classes and specifications wiring. Include then there is likely a better, simpler way of achieving what you are trying to do. Include(v => v. Select(c => new { c. Subtitles) . But if there is a better solution, I would love to hear it. Learn how you could use included related entities by filtering them. z)), because . Explicit Includes give you precise control over which related data gets loaded, helping you: Avoid over-fetching. SelectMany(x => x. include() isn't a method of the property, but rather of the DbSet you're querying. Approved == true). the question is how to filter data with Include clause? Jan 12, 2024 · ThenInclude with Select unexpected behavior #32796 Closed daniel18acevedo opened this issue on Jan 12, 2024 · 2 comments Nov 25, 2023 · Introduction In the evolving landscape of Entity Framework Core (EF Core), managing data retrieval for complex object graphs is crucial. This leads me to a few issues, but the most concrete one is a warning when I try to use ThenInclude with a propert Jul 29, 2010 · 224 EF Core For eager loading relationships more than one navigation away (e. NestedProp) If so what is the point in using Include / ThenInclude as they both work and produce the same SQL. The EF Core equivalent syntax of EF6 . Read here why it's done that way. En el ejemplo siguiente se cargan todos los blogs, las entradas relacionadas y el creador de cada entrada. The next version of EF Core will also support the filtering & Ordering of the related data. 本文探讨了EF Core中Join和Include方法在表连接上的不同，包括Join的灵活性和结果字段指定，以及Include针对外键关联的便捷性和即时查询。通过实际案例解析了如何在唱片表和流派表的连接中使用这两种方法，并强调了Include在效率上的局限性及其替代方案ThenInclude。 Aug 11, 2017 · The issue with that query is that the longtext field will be retrieved and it could be quite big, so if I have 100 courses, the data transfered from the database to the server could be quite big. 0 中，生成的 SQL 语句没有涉及到 ClientUserRoles -- 它本质上只是 3. PartyMailingAddress) . g. NET Core / EF Core application I have a model with a nested list of child objects. It will create one query with needed data using SQL JOIN clause which is more efficient as compared to the previous one. So even if you don't explicitly include the data for a navigation property, the property may still be populated if some or all of the related entities were previously loaded. In addition to this, it also provides the ThenInclude() extension method to load multiple levels of related entities. Property. Nov 1, 2017 · One option that comes to mind is rewriting all Select to ThenInclude inside your FirstOrDefault implementation. What looks like a shortcut often bloats your SQL, fetches unnecessary data, and hurts Jan 18, 2022 · EF Core - How to retrieve base class and conditionally include property on derived class [duplicate] Asked 3 years, 8 months ago Modified 3 years, 8 months ago Viewed 3k times Feb 25, 2019 · In my . Jun 22, 2015 · How does Entity Framework work with recursive hierarchies? Include () seems not to work with it Asked 16 years, 1 month ago Modified 5 years, 2 months ago Viewed 92k times Entity Framework LINQ related extension methods. After that then include is not working in EF core 6 eg public class Parent { public int Id { get; set; } public string Name { get; set; } public… Specifies related entities to include in the query results. Include(cr=> cr. Include(). Here is my situations: I am responsible for the support of a large application full of code smells. Dec 23, 2019 · First ThenInclude operates on ICollection<Animal>, so why the next ThenInclude operating in ICollection<Dogs> should be a problem? In case Intellisense is not showing it, just type it and will work. Question about eager loading of nested entities using Entity Framework Core (EF core) Edit: Kind of solved this problem using auto-includes. Where(u =&gt May 27, 2020 · You cannot mixte Include with IncludeFilter. 2w次，点赞8次，收藏12次。本文详细介绍了在. Include(c => c. 2021年了，仍然有问题，这也不是重复的。 OP正在询问OrderBY，这与DUPLICATE答案不同。 所以这是正确的答案!! 对于其他人查找-如果在ThenInclude内进行OrderBy，EF core将首先使用PK，然后是orderby字段，因此您的排序结果将不会如预期。 第一个OrderBy将起作用，然后其他OrderBy将无法在ThenInclude内工作。 请参见 Sep 15, 2022 · Hello, I am trying to get only IsActive=1 data with this Linq; _db. Select(s => s. NET Core with Entity Framework without a "clunky" repository? Mar 3, 2024 · Explore the in-depth guide of eager loading the child entities in Entity Framework Core. Where(p => p. Eager loading allows you to retrieve related data in a single database query, which can improve performance compared to lazy loading, where related data is loaded on demand. NET Core Web API is a technique using Entity Framework Core to load related data (like child entities) alongside the main entity in a single query. The . TemplatesFields Jun 21, 2023 · Parameterizing ThenInclude () in Entity Framework David Thielen 3,211 Jun 21, 2023, 8:42 PM Jun 17, 2025 · Entity Framework Core EF Core has a new extension method ThenInclude (). Thanks! Sep 12, 2023 · In-depth information on the more complex LINQ query operators when using Entity Framework Core Continue to help good content that is interesting, well-researched, and useful, rise to the top! To gain full voting privileges, Jan 24, 2024 · The warning is safe to ignore since the expression will be translated by EF core to an SQL Query, and won't be actually evaluated by the . Include() extension method to return a collection of objects that have a child, where some of the children will be null. IsActive) office. I known I can use ThenInclude () to select sub navigation properties of a entity, but how can I select siblin Jun 17, 2025 · The best way to avoid the select N+1 problem in Entity Framework is to use the Include method. ModelB) worked in EF6, but it doesn't work in EF Core. Having multiple Include () calls may result in a data loading side effect called Cartesian Explosion. Otherwise EF does INNER JOIN. Improve your application’s performance with practical examples and tips. Sep 12, 2023 · Puede explorar en profundidad las relaciones para incluir varios niveles de datos relacionados con el método ThenInclude. StudentID. FirstOrDefault ()) to get the latest child of parent. Keep your queries lean and mean. PropertyParty . Users . Include is meant to eagerly load related entities, not join with other entities, or perform projections (that's what Select is for). Party) . Jul 26, 2022 · EF Core使用Include和join，以及Include和ThenInclude区别和使用 在EF中表连接常用的有Join ()和Include (),两者都可以实现两张表的连接，但又有所不同。 例如有个唱片表Album（AlbumId,Name,CreateDate,GenreId），表中含外键GenreId连接流派表Genre (GenreId,Name)。 Aug 10, 2022 · By making a smaller object that you use in the . SpecialTags) The following query shows including two levels of entities on the same branch, second one being on derived type using the as operator. Select() statement, EF will translate this request into a much more optimized query to the DB that only selects the few fields you actually need, and not even return any of the unwanted fields from the database. ThenInclude() methods are part of Entity Framework Core and operate on a DbSet, not directly on the properties themselves. NET Core中，如何利用Linq的Include和ThenInclude方法，从主表及其关联的子表中高效查询一对多的数据结构。通过具体的代码示例，展示了查询单个主表数据及其所有子表数据的方法。 May 3, 2020 · Linq: Join vs Include/ThenInclude in Entity Framework Core Asked 5 years, 3 months ago Modified 5 years, 3 months ago Viewed 3k times Jun 17, 2025 · Unlock the power of Entity Framework by including related entities with a 'where' clause in your LINQ query. Include() and . What are you trying to do with ques. This pattern was used in EF6 which supported a special syntax (Select) inside the include expression to resolve collection element. Jul 13, 2022 · EF Core Filter include and tracking Intro Filter include is a great feature of Entity Framework Core (introduced in EF Core 5. 0). Jul 8, 2025 · Learn how to avoid the N+1 query problem in Entity Framework Core using Include() and AsSplitQuery(). Jul 31, 2019 · I'm using Entity Framework Core, and I want to get a list of currencies (euro, dollar, ). ThenInclude() methods are used to load the related entities (see the documentation on eager loading). Include (i => i. AndInclude() method, which can be tacked onto a call to . Title Apr 14, 2016 · I have an entity with multiple navigation properties which I'd like to eagerly load when selecting the entity from the database. grand child or grand parent relations), where the intermediate relation is a collection (i. Cc @anpete in case I am wrong. Select(vm => vm. netのModel参照でデータを取得する場合に避けて通れないInclude関数で盛大な勘違いをしていたことについて書いていきたいと思います。 When translating and executing your LINQ queries, EF Core guarantees that if an optional related entity does not exist, any navigation to it will simply be ignored, rather than throwing. Choices. I tried to find a solution in StackOverflow, but no-one really fits my complex query. We don't have the class definition so it makes it hard to know exactly the relationship but the query should look like this: var result = await db. The Include Lambda method is an extension method from the namespace Microsoft. The message is clear. That is, EF automatically adds the separately retrieved entities where they belong in navigation properties of previously retrieved entities. 在 EF Core 5. Yes, it does really affect the speed. ThenInclude (v => v. Dec 3, 2024 · Both parent line items and sub line items had the BookingId set, which caused EF Core to use that relationship to pull the sub line items into the top-level list when querying at the Booking level. context. 1 SQL 语句中的第一个子查询。 如果我修改查询，将 Where() 调用移到 Include() 调用之后，它就可以工作了。 Mar 16, 2019 · 文章浏览阅读1. ThenInclude(). Blogs. Jul 31, 2018 · Given the following query in EF Core 2. 1: var inventorySummary = myContext. OrderByDecending (C => C. ThenInclude() is you telling EF to include all that intermediate data. Select(b => b. Learn how including related objects help to simplify your LINQ query. 1 Operating system: Win10 Visual Studio version: 2015 Other details about my Our goal is to query a database, using Entity Framework Core and the . ) ? Jul 26, 2016 · You shouldn't need to use the Select syntax with EF Core (in fact it's not supported). The DbSet represents a collection of entities of a specific type - the type specified by the type parameter. Can anyone confirm or speak to? Sep 11, 2023 · ヒント Entity Framework Core は、以前にコンテキスト インスタンスに読み込まれた他のエンティティに対して、ナビゲーション プロパティを自動的に修正します。 そのため、ナビゲーション プロパティのデータを明示的に含めていない場合でも、関連エンティティの一部またはすべてが以前に I use Entity Framework Core 2. Sections. SubtitlesInclude / ThenInclude with where in EF Core Jan 13, 2022 · In this article we are going to learn about Queries in Entity Framework Core and different ways to use them to fetch out data from the database. OrderDetails. 0 nullable reference types, and I am trying to find the right pattern to use. net-core entity-framework-core asked Feb 6, 2017 at 8:28 user4229770 Jan 29, 2025 · What Are Explicit Includes? When you fetch an entity in EF Core, its related data doesn’t magically appear unless you tell EF Core to include it. If you use the overload with collection, ThenInclude operates on the type of the collection element, so at the Apr 28, 2020 · In this article let us explore the Eager Loading in EF Core using the Include & ThenInclude method. Mar 31, 2025 · Eager Loading in ASP. Jun 22, 2025 · Unlock the power of EF Core by using Include and ThenInclude to retrieve related entities. Include. Select will ignore the . The ThenInclude method moves the chaining level to the property included. Also in general avoid DefaultIfEmpty parameterless overload for anything else than left outer join pattern because while it is supported, SQL translation is quite weird. Feb 6, 2025 · When working with multiple tables in EF Core, you can use Include () for simple relationships, LINQ for straightforward queries, or raw SQL for complex join scenarios. PupilsTests) Note that there seems to be a VS Intellisense issue inside the ThenInclude, so just type the above and it will compile successfully and work. Implementing conditional include at the root query level is relatively easy. Sep 17, 2022 · I recently ran into an issue with Entity Framework Core. Feb 19, 2020 · The problem is that EF Core Include / ThenInclude chain cannot be represented with Expression<Func<T, object>>. Include (x => x. Be selective about, well, selecting which properties you want from which tables. Mar 7, 2016 · If I tack on anther . InventoryEntries . select * from Student s LEFT JOIN StudentDescription sd on s. As with LoadAsync the query is split up into smaller 21 Exactly: If StudentDescription. They ask EF Core to retrieve the data from the database, and load it in the associated entities. Visual Studio IntelliSense gets confused with Include/ThenInclude (we're getting that fixed) but you should just be able to do a ThenInclude for the related property without using Select. Sep 19, 2022 · Select is used to project an entity query into a desired data structure, or otherwise retrieve pieces of information about an entity. Jul 8, 2025 · Learn how to avoid the N+1 query problem in Entity Framework Core using Include () and AsSplitQuery (). Nov 16, 2020 · Загрузка связанных данных в Entity Framework Core, Eager loading и методы Include и ThenInclude, Explicit loading и метод Load, ленивая загрузка Lazy loading EF Include statement to only return one child by highest datetime if I have a Parent object that has a property Collection<Child> I want to query context. Jan 1, 2020 · Avoid DefaultIfEmpty overload with default value - it's not supported by EF Core query translator. Developers often face performance issues with multiple related entities. NET vào các truy vấn LINQ-to-Entities. AsNoTracking () at the start of a query is sufficient to affect the entire query, making all entities returned by that query not tracked by the DbContext. PurchaseOrderItem). UserRoleMappings)). Where(o => o. Where (o=> o. y. I'm not sure how it's implemented, but I think it could at least remove the Entities IDs from ORDER BY and SELECT clauses if the Entity doesn't have a '. However, the compiler is unaware of this EF Core guarantee and produces warnings as if the LINQ query were executed in memory, with LINQ to Objects. 2, select statement should be replaced with ThenInclude – Yehor Androsov May 3, 2019 at 11:53 To my best guess, EF uses the initial setup . If you use the overload with collection, ThenInclude operates on the type of the collection element, so at the end you always end up with a single entity type. The public API is fully annotated for nullability starting with EF Core 6. IsFired) I know I can not use Where inside Include. Modules. Include so applying a filtering there will have no affect. StudentId is nullable -> EF performs a LEFT JOIN, i. OrderDetails). You can retrieve some of the data in separate queries, and EF "fixes up" the navigation properties. You should have a look at LinqPad, you can hook it up to your entity framework model and see what SQL is generated for your queries very easily, it's saved me so many times. Videos). The introduction of AsSplitQuery in EF Core 5. EF Core do not track custom projected entities. Oct 13, 2021 · Select field inside nested ThenInclude table using Entity Framework core query Asked 3 years, 9 months ago Modified 3 years, 8 months ago Viewed 388 times Apr 4, 2015 · select specific columns when using include statement with entity framework Asked 10 years, 5 months ago Modified 10 years, 5 months ago Viewed 45k times Hello, if for EF core this does indeed work . Tests). May 10, 2020 · In EF 6 you can do . NET Framework that provides query capability against collections in C# or VB. Instances) which is a bit faster (I guess, haven't looked at SQL Profiler and actual query tbh). ThenInclude(post => ((SpecialPost)post). Vendor). Each . To solve the problem with applying Max, Min and Average methods on empty sets, use the nullable overloads which return null for Nov 28, 2017 · I have this query using Entity Framework Core (v2), but the Include/ThenInclude don't work as I expected. public partial class Run { public int Id { get; set; } public int Ru Mar 15, 2018 · – gsharp Mar 16, 2018 at 7:46 1 it does not work for EF Core 2. Queries are specified using Language Integrated Query (LINQ), a component in the . . Select(prod Sep 13, 2023 · Dica O Entity Framework Core corrigirá automaticamente as propriedades de navegação para outras entidades que forem carregadas anteriormente na instância do contexto. See full list on code-maze. ToList(); How can I get all fired people of all active offices using Entity Framework Core? I'm getting this error: Where clause in not valid inside ThenInclude or Include company. FirstOrDefault() will indeed load the data pretty much exactly as in your post assuming that there's only one course in the table. Any (od LoadAsync LoadAsync - Split queries into smaller chunks LoadAsync in combination with a EF-Core DbContext can load related entities. Each currency is associated to 1-n countries, so there are 3 columns at play here : Jan 28, 2021 · See the code below which shows the two SQL queries produced in EF Core 3 and 5. Aug 16, 2019 · I am trying to use EF Core with the new C# 8. Just removing a single . Apr 10, 2024 · You specify eager loading in Entity Framework Core by using the Include and ThenInclude methods. ThenInclude(c=>c. I propose that the IIncludableQueryable interface should also expose an . Select (s => s. net-core and Entity Framework Core and Identity? Asked 6 years, 4 months ago Modified 6 years, 4 months ago Viewed 3k times May 23, 2023 · Of what I have seen using a combination of these 2 won't work because . No problem. You can flatten the Multiple collections. Oct 25, 2024 · リレーショナル データベースに対して動作するとき、EF は JOIN を単一クエリに導入することによって関連エンティティを読み込みます。 SQL を使うときは非常に標準的な JOIN ですが、不適切に使うとパフォーマンスに重大な問題が発生する可能性があります。 このページでは、これらの How to use include and theninclude in EF Core? The eager loading in EF Core done via the Include & ThenInclude methods. SelectMany(z => z. ThenInclude(), and the syntax is slightly different to the older EF 4-6 syntax: Jun 17, 2018 · I'm creating an ASP. c# entity-framework linq asp. Include () method adds an additional SQL JOIN statement to the final SQL query resulting in more and more records being returned by ef core. It allows us to include related objects from the next level. NET Core API app, and relying on EF Core. 4) (using scaffold) that are related between themselves. We need to refactor and add support, but honestly, I have no bright idea of how to do it. How to use `Include ()` and `ThenInclude ()` for eager loading? This tutorial demonstrates how to use Include() and ThenInclude() in Entity Framework Core for eager loading related entities. Reverse engineering did not support C# 8 nullable reference types (NRTs): EF Core always generated C# code that assumed the feature is off. Select(x => x. Include(blog => blog. core I seem to not be able to do . ThenInclude (r => r. NET Framework及. How do you reuse queries in . Let's update our query by using the Include method. /* rest of the expression here*/ ) May 7, 2018 · Just start with IQueryable<T> variable (note that IIncludableQueryable<T, P> is still IQueryable<T> with additional ThenInclude support) and use ThenInclude instead of nested Select s: Jun 17, 2025 · Unlock the power of Entity Framework by improving your include performance. Include () and . You can drill down through relationships to include multiple levels of related data using the ThenInclude method. VideoMetas. ThenInclude(parent). So, how do you load a collection or other **related objects?** Here are the main options: 1️⃣ Eager Loading (Include) Dec 12, 2020 · All Include and ThenInclude expressions are parsed and stored as navigationPropertyPaths (string value) in the specification. DOB). Apr 8, 2021 · When you’ve created tables that are related, you’ll often need to get data from both tables at once, or filter records from one table based on values in another table. Ideal for situations where related data is always needed. When I retrieve an instance, I need the nested list to be ordered by one of the child's properties. People. So when it finds a Parent object in the Child object, instead of using no includes (which I don't have any after the ThenInclude) it uses . IncludeFilter(pm => pm. Organization!. Sep 11, 2023 · 提示 Entity Framework Core 會將導覽屬性自動修正為先前已載入至內容執行個體的任何其他實體。 因此，即使未明確包含導覽屬性的資料，如果先前已載入部分或所有相關的實體，則仍然可能會填入該屬性。 您可以將來自多個關聯性的相關資料包含至單一查詢。 Jun 22, 2025 · Unlock the power of EF Core by joining entities to combine rows of multiple tables. Big data sets for the reason, that it can happen that the timeout will be reached easily. In my experience, if you find yourself using . Jul 22, 2025 · . x, với các truy vấn SQL được tối ưu hóa hơn và khả năng đưa các phương thức C# / VB. Dec 30, 2021 · I have four models auto generated by Entity Framework Core (2. Jan 6, 2020 · In EF Core, how to solve an Include ThenInclude chain circular reference? Asked 5 years, 8 months ago Modified 5 years, 8 months ago Viewed 4k times Jan 8, 2024 · The official documentation covers this subject. Aug 27, 2019 · The advantage of using Select is that you don't need to use Include unless you are selecting whole entities and want to include related entities as part of that returned entity graph. Apr 12, 2024 · 20 Essential Entity Framework Core Tips: Optimize Performance, Streamline Queries, and Enhance Data Handling Learn how to boost query performance, operations, and manage large datasets effectively. I have entities defined like this: public class AppUser : IdentityUser { public string FirstName { get; set; } public string May 30, 2023 · In EF core 3. Nov 26, 2018 · EF Core still processes projections and includes differently, so it might be a defect in the current processing. As the title suggest I am looking for a way to do a where clause in combination with an include. There's indeed one extra ORDER BY in the 5 version, but definitely not all of them. The navigation property to be included is specified starting with the type of entity being queried (TEntity). (2) Only unique paths are included in the generated query. So you can get a list of teachers and students' names: Apr 26, 2017 · I'm trying to filter on the initial query. ApplicationsWithOverrideGroup. The following example loads all blogs, their related posts, and the author of each post. In this tutorial, we look at include method and learn how to load entities from Feb 10, 2019 · I need to use where in ThenInclude var templatesFields = await _context. 0. NET runtime (so no NullReferenceException would be thrown). Improve your application's performance with practical examples and tips. When using Automapper's ProjectTo or using Linq's Select you do not need to Eager load, the projection will load the data based on what is needed. Select(cc => cc. If you have compilation in the IIncludable extension methods, have you the required using from EF for having EF include extensions methods? May 29, 2019 · I am doing a complex Entity Framework select query and I want to exclude one specific column in an object that is "ThenIncluded". Include(x => x. They are evaluated in EF Core using the method overloads which accept navigationPropertyPath. ThenInclude (). Tests. Include (d => d. how would you handle this in EF ? Apr 2, 2024 · As far as I remember, in Entity Framework Core, applying . This article will delve into the functionality of Jan 24, 2023 · AsNoTracking() is not needed if you select custom entity via Select. How to write a proper query . Jun 1, 2022 · "Classic" Entity Framework (EF6) solves the collection include syntax problem with standard LINQ Select, i. Posts). ThenInclude(x => x. Jan 26, 2020 · . Eager Loading of Related Data Use an Include () for each of the Entity members you wish to include in the results. Select(. That is useful when handling with big data sets, cartiasian explosion (wanted or unwanted), lots of joins or unions. 1 I am able to include a collection of object using include statement. I might as very well not understand Entity Framework Core completely, and to juggle with the options. It tracks only WHOLE entities. Am i missing something? Jul 5, 2023 · This notably includes the async LINQ operators exposed by EF Core, such as FirstOrDefaultAsync. We Nov 27, 2015 · @davidroth As far as I know EF Core currently doesn't support any pattern you could use to express that you want query results to include navigations that only exist in derived types. Hey colleagues, could you give a meaningful example of the proper usage of EF Core's ThenInclude method? Oct 29, 2016 · but I get an ICollection in the last lambda displayed, so I obviously need the Select () No, you don't. In other words Nov 16, 2020 · みなさんこんにちは！ひろぽんです！！ 今回はAsp. In EF Core, the IncludeFilter should automatically add all paths. ThenInclude(parent) when it encounters with any Parent object for that query. We use the include & ThenInclude methods, along with the Projection Query in EF Core to load the related entities. include(x => x. Modules). Where(c => c. ThenInclude', and we won't need the LEFT JOIN there. If you just do something like this you'll get a query that's about as efficient as you can get: var results = await _db. For example: using (var context = new BloggingC EF's ThenInclude and Linq's SelectMany what's the difference. As for how such pattern could look like, here is something we thought about in the past applied to the new ThenInclude method: Oct 28, 2017 · IncludeメソッドとThenIncludeメソッドは、あわせて読み込む関連エンティティを指定するために使います。Eager loadingと呼ばれている機能ですね。 Loading Related Data - EF Core | Microsoft Docs このIncludeメソッドとThenIncludeメソッドを使うとどんなSQLが実行されるのか気になったので試してみました。実行され Jul 1, 2023 · The syntax you initially tried with . Nov 17, 2019 · Query specification implemented for Entity Framework Core. Both they have separate overloads for collection and reference type navigation properties. 1. Roles)) is not valid, although similar syntax was previously used in full EF Include method to load multiple levels when ThenInclude was not available, e. As the name implies, . 0) with Linq and GroupBy clause I noted that the ThenInclude method does not properly receive the objects Steps to reproduce Jul 25, 2021 · Include / ThenInclude are used when you want to return an entity and eager load related entities and their respective related entities respectively. Jan 19, 2023 · You can drill down through relationships to include multiple levels of related data using the ThenInclude method. Users. ThenInclude (poi => poi Sep 16, 2016 · Every example for Include->ThenInclude seems to assume the nav properties are simple objects not collections. You can apply on multiple tables and at multiple levels etc. In this article… Aug 26, 2018 · But note that Entity Framework Core will automatically fix-up navigation properties to any other entities that were previously loaded into the context instance. ThenInclude(), I'm now dealing with C 's. com Entity Framework Core supports eager loading of related entities, same as EF 6, using the Include() extension method and projection query. ukzsk prr ftltmbp czqje vffugs itftk pcewwg nqjjw crighi masydkb