Ef core include not working Here’s an overview of my entity classes: I have a look at definitions and examples of EF Include() method but unfortunately, there is not a proper explanations for my question "What is Entity Framework Include () and when to use it?". Learn how the Include method works and how you should use it. But if there is a better solution, I would love to hear it. Access Apr 28, 2020 · In this article let us explore the Eager Loading in EF Core using the Include & ThenInclude method. I have 2 tables in SQL server without a FK : So each Image has many Comments. NET Framework to . Edit: Just to be clear, in the title I said keeping track of entities beca Sep 30, 2022 · Eager loading of collections can come with pitfalls when it’s not clear if the collection has been loaded or not. Select will suppress the . A query like _db. Data. Jan 2, 2020 · The SQLite 3. I had found an online solution available i thought worth sharing. Filter in include reduces incuded collection by filter. Correct your query: Nov 18, 2021 · This worked fine until moving from EF core 5 to EF core 6. Mar 17, 2019 · Why is EF core one-to-one relationship not working as expected? Asked 6 years, 8 months ago Modified 6 years, 8 months ago Viewed 2k times May 11, 2022 · I think that one of the most convenient features of ORMs like Entity Framework is the ability to reference related data via properties on an object or entity. However looping as in the example above doesn't work. B). For example: loading products along with their translations. With EF 5 it's now possible to use a Where clause inside an Include, but is there a way to use an OrderBy inside an Include? I tried items = items. 4k 4 21 40 Nov 21, 2023 · Question Did Contains stop working on empty list in EF Core 8? My database server is Microsoft SQL Server 2017, compatibility level is set to 140. However, in other cases, EF Core 3. Anybody… Jan 30, 2024 · Description I created custom queryable and custom query provider to be able integrate caching directly into IQueryable. Oct 24, 2019 · Why are you including cycles? If your purpose is to have Questions populated then EF Core does that already. If final projection is not entity type Jul 1, 2023 · I'm working with a . 1 would do the opposite and leave the existing non-null value. I am using Entity framework 4. And still don't get it why the default behavior for such an example seem to be Mar 30, 2017 · I need to query one object with its related objects, I am using the unit of work pattern and repository pattern. Upvoting indicates when questions and answers are useful. ModelA. . DocumentGroups . 4. Finally it's a long time I've not been working with EF and Linq-to-entity, so I may not help you much. While JOINs are quite standard when using SQL, they can create significant performance issues if used improperly. Sep 14, 2020 · EF Core query with GroupBy and Count not working as expected Asked 5 years, 2 months ago Modified 5 years, 2 months ago Viewed 2k times Jun 8, 2020 · Using Microsoft. I can do db. Jun 21, 2023 · I've created a way to set up my EF queries to take what gets Include() via passing a parameter. NET Core application that uses Entity Framework Core to interact with a SQL Server database. In our project we have been using the InMemory provider with EF as part of our unit testing strategy. NET Core to 2. Include is EF specific API which tells EF to load navigation property when creating object of mapped entity type. I have 4 tables User, Role, UserCredentialMapping, UserRoleMapping as shown below as classes) for user manag Nov 4, 2017 · EF Core Linq Include method not working by yelenamaks » Sat 04 Nov 2017 15:07 I recently updated to asp. NET Core 3. As I understand it, the include method works as LEFT JOIN when the enclosed object is NULL and as OUTER JOIN when the object has match. Can we get someone else to weigh in who knows the exact details of the implementation? If I upgrade the provider (which I cannot without breaking everything, or rolling back . ModelB) worked in EF6, but it doesn't work in EF Core. I'm using GroupJoin. First one is in TPH : public abstract class Event { public long EventId { get Nov 26, 2021 · The next issue is caused by EF automatically filling in the reference properties (it is called relationship fix-up) which will introduce cycle which serializer by default does not handle. So (assuming FilterForms and SortForms don't do anything strange to the query) you just need to run the Mar 5, 2025 · Struggling with Slow EF Core Queries? You Might Be Using . include matchparticipants is not working. For clarification, is this the intended behavior for EF Core? Thank you. Jul 27, 2020 · Note that this is not an issue using EF Core 3. The techniques shown in this topic apply equally to models created with Code First and the EF Designer. 1. Select on the other hand, is the Projection of what you need exactly to return, if you use Include with Select that has no meaning because we already say what we exactly want in Select Statement Here what you want. include(x => x. Load () performance in EntityFramework Lazy Loading vs Eager Loading We would like to show you a description here but the site won’t allow us. ApplicationsWithOverrideGroup. OrderBy(o => o. NET Core, I've encountered an unexpected behavior in Entity Framework Core related to the use of . The navigation property to be included is specified starting with the type of entity being queried (TEntity). Include(a => a. Jun 27, 2018 · I've just updated my EF Core to 2. Entity instead of Microsoft. Modules. In my judgement the Include(string) is useless if you can't Mar 8, 2021 · According to the docs we have the possibility to use Where() inside Include in EF Core 5. Include please review these previous posts: Lazy Loading not working in EntityFramework Core Entity Framework - what's the difference between using Include/eager loading and lazy loading? . In EF Core you have to use "ThenInclude". This use can clearly see in the generated queries. SqlServer and Npgsql. Include. Entity Framework Core Plus Query IncludeFilter Description With Entity Framework, "Include" method is often used to load related entities / child collections. But when I put the GroupBy in comment it works fine. EntityFrameworkCore. This post shows one such pitfall and one approach to working around it. If you want to get products in specific category, you need to filter products, like you did in second query, and not categories in random products, like you did in first one. In reference navigation case it creates such a simple join. What is the general purpose of it and why / when should I use it? So by default you have to include every time you want to load a navigation property (a property referencing to another entity/table). Can anyone confirm or speak to? Entity framework does not get Foreign key objects Hi, I have a pretty simple asp. An included navigation property works after a GroupBy, but when you add an OrderBy on the group, the included properties are ignored, and are null in the results. I do not understand why I should have to load the "schedules" List. NET6 and EF Co Mar 7, 2016 · Now suppose I want to retrieve all A 's and include their B 's and both of B 's C sub-properties. Select runs client-side. EF Core doesn't work like EF Framework. 022621 Build 22621 IDE: Visual Studio 2022 17. AsNoTracking() methods. Include() and . 1, reference navigations eagerly initialized to non-null values would sometimes be overwritten by entity instances from the database, regardless of whether or not key values matched. 0 to 2. GetById should always return Client with all its addresses or not. InMemory v5. When you write the query, you have to use the . Include() not working for many-to-many relationships in Entity Framework Core. Set<TEntity>(); query = query. I have a specific issue where I'm unable to retrieve the expected results when using the Include method along with Contains in a Where clause. Include (i => i. Using this command I've created scaffolded files : dotnet ef dbcontext scaffold "Server=sff-pc;Database=IMG; With EF 5 it's now possible to use a Where clause inside an Include, but is there a way to use an OrderBy inside an Include? I tried items = items. If I tack on another . Explicit loading means that the related data is explicitly loaded from the database at a later time. Specifies related entities to include in the query results. The . Jul 31, 2018 · Based on initial investigation done on this issue, it was caused because of GroupBy + Contains combination. net core 2. I've just hit the same issue. we use canned responses for common triage decisions. For this code I get 2 companies which is what i expected. Dear community, I have a problem regarding loading a deeply nested hierarchy of entities. ThenIncludes () methods to pull back navigation properties. Using unmodified scaffolded web API controllers in Visual S Jul 31, 2023 · Using AutoInclude on navigation property when using a unidirectional many to many does not include the related entities. TLDR: I would like to know if using different "include logics" for one entity type in a single query possible in EF core. See full list on learn. PostgreSQL (this is the main one) Hello, if for EF core this does indeed work . Include (x => x. The problem is that it always generates an inner join and since one of the referenced elements is null the result is always an empty list. ChildProperty)) but this didn't work. 5 Mar 28, 2024 · 3 You messed up with Where and Include. That's why you can't chain them like x. Nullable reference types are enabled by default in new project templates, but remain disabled in existing projects unless explicitly opted into Apr 5, 2018 · . May 30, 2022 · Include is not about JOIN but about loading related entities. Dec 23, 2021 · SCENARIO If I split the Entity Framework linq query to evaluate an IQueryable first and after try to include some properties, the value of AccessGroupAccessPoints and AccessGroupAccessPoints. Aug 4, 2017 · I've just encountered this problem myself, upgrading from EFCore 1. 9 Operating system: Windows 11 Pro 10. Explicitly including them in the Linq query works as expected. A. e. Jun 14, 2023 · Relationships are not fixed up between the current child and other children that have been previously loaded. It always says Null when I debug. An easy and clean way to fix this is to use implicit includes over explicit ones. 0-preview. public IEnumerable<Company> GetAllCompanies( Jan 8, 2025 · Include is not meant for filtration! It's just to load some related data with the same request. Select. Question about eager loading of nested entities using Entity Framework Core (EF core) Edit: Kind of solved this problem using auto-includes. Jul 3, 2017 · Don't mind the strange table and column names, they come from obfuscating my real world names. Include by no means a pointer to tell EF to perform a join. We use the include & ThenInclude methods, along with the Projection Query in EF Core to load the related entities. C1) to include one of B 's C sub-properties, but as far as I can tell, there's no way to include both of B 's C sub-properties. Nov 4, 2020 · Include in Entity Framework Core is not working properly Asked 4 years, 5 months ago Modified 3 years, 8 months ago Viewed 212 times Feb 5, 2020 · While working on a project it seems very hard to do this stuff using standard EF Core library. Split(","); var hkm = _context. Mar 5, 2021 · There is a breaking change in EF 5 related to the semantics of a required nagivation property from the principal (Question) to the dependant (Answer) which might be the explanation for the wrong behavior after upgrading the library. include(y => y. Apr 25, 2023 · Tracking behavior controls if Entity Framework Core keeps information about an entity instance in its change tracker. 23329. Include(s => s. When there is an entity in the projection to which the Include can be applied, it is applied. Dec 23, 2022 · In this article, we are going to show you how to use Filtered Include method in EF Core to filter results inside the include method. ThenInclude() methods are part of Entity Framework Core and operate on a DbSet, not directly on the properties themselves. For collection navigations, it creates multiple queries to support streaming. 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 8, 2017 · ArtemLysenko changed the title It seems that Include method does not work in some cases It seems that Include method does not work in some cases (EF core) on Jul 8, 2017 Feb 2, 2017 · You'll need to complete a few actions and gain 15 reputation points before being able to upvote. My setup works fine for one-to-many relationships, but the related entities are not being loa Mar 29, 2024 · 1 Since upgrading from . include() isn't a method of the property, but rather of the DbSet you're querying. Children. NET 6 API project. core I seem to not be able to do . 20220. In EF 6, both "schedule" and "schedule_2" return the correct value of Name. Jan 30, 2022 · In the code below, I am attempting to reference an "Include (d)" entity (Schedules) to obtain its Name property. Apr 2, 2013 · In EF. Feb 26, 2021 · Hi, Thanks in advance for the help. It has no impact on starting dbset itself. However, understanding its limitations and knowing when to override it with IgnoreAutoIncludes () is crucial for maintaining optimal performance and flexibility in your queries. Jun 17, 2025 · Unlock the power of Entity Framework by understanding when you should use the Include method. Include to load data from a Jul 12, 2024 · I'm having trouble with . Entity Framework Core will automatically fix-up navigation properties to any other entities that were previously loaded into the context instance. The following screenshot works when I use a SQL Developers often use AsNoTracking in the belief that it will increase performance when performing read queries in Entity Framework. Include never worked with . Jul 24, 2016 · Been having a play about with ef core and been having an issue with the include statement. Chapters)), specifically the . But when executing query, it's not considering Include operation inside expression, I assume EF Core preprocessors fo Oct 4, 2019 · The Entity Framework Core (EF) extension method Include provides us the ability to load additional data besides the entities we are querying for. Since you query does not contain GroupBy, it may be similar issue but with different root cause. If you wish to include additional types based on the navigation properties of the type being included, then chain a call to ThenInclude<TEntity,TPreviousProperty,TProperty>(IIncludableQueryable<TEntity, IEnumerable< Apr 1, 2021 · From docs: Old behavior In EF Core 3. Include() to get those. However, the method doesn't let you use LINQ queryable methods like Where to filter entities to include which is a major drawback. Here is my situations: I am responsible for the support of a large application full of code smells. Jul 20, 2023 · Include provider and version information EF Core version: 8. In this post, we'll be looking at a few different ways to load related data in EF Core 6. 10, I am having an issue with the Filtered Include and the In Memory DB provider. ThenInclude not working for an Entity Framework LINQ query [duplicate] Asked 8 years, 8 months ago Modified 8 years, 8 months ago Viewed 18k times Sep 9, 2020 · I have a project with ASP. As the title suggest I am looking for a way to do a where clause in combination with an include. Here is an example usage. Include(x => x. So, you in your current case you basically have to decide if your ClientRepository. Nov 1, 2016 · I would expect this to make 2 trips to the database instead of the one when you use Include on the DbSet. This post explains why this approach is flawed and its usage may actually be a sign of an underlying problem - a problem that is made even worse by the use of Include. x with more optimized SQL queries and the ability to include C#/VB. 2 Database Provider: Doesn't work on both Microsoft. Since upgrading all my Linq queries using Include Method are failing, it is not translated properly to SQL. But you might have been getting partial client-side execution in EF Core 2, where your . Include(b => b. I'm using . So you'll need to have your IQueryable be a generically-typed IQueryable<> of some kind. With EF core 6 the result list contains some null values (which should not be the case because the where condition asks for not null). I am facing an issue with the new Include filter on EF Core 5. Include () Wrong Introduction When using Entity Framework Core (EF Core), developers often need to decide how to efficiently load related … Mar 11, 2021 · Entity Framework Core allows you to use the navigation properties in your model to load related entities. Consider the following entities: Aug 18, 2017 · I have a question and possible bug to report in EF Core 2. 0 bits. Mar 30, 2017 · I need to query one object with its related objects, I am using the unit of work pattern and repository pattern. In EF Core, "schedule" returns NULL and "schedule_2" returns the correct value of Name. Oct 31, 2024 · In EF Core 8, there are no non-generic overloads of the Include method. For this case you can write: Jan 25, 2024 · When working against relational databases, EF loads related entities by introducing JOINs into a single query. Apr 26, 2017 · The not so simple rule is: projections don't always ignore Include. Nov 4, 2016 · EF Triage: Find is not a query operator, but a convenient way to retrieve a single entity by key and save a database roundtrip if the entity you are looking for is already loaded in the context. For instance this: Code: Select all Jun 7, 2021 · . And still don't get it why the default behavior for such an example seem to be Querying in Entity Framework Core remains the same as EF 6. When should you use Include and when you shouldn't ? Nov 21, 2023 · Question Did Contains stop working on empty list in EF Core 8? My database server is Microsoft SQL Server 2017, compatibility level is set to 140. Using a context instance to add a child entity X (a post in this case), but later filtering the ch Aug 5, 2023 · I'm currently working on an ASP. 0 @rowanmiller provided an excellent workaround for a string based include function which allowed me to do this in my core repository: This would work. If an entity is tracked, any changes detected in the entity are persisted to the database during SaveChanges. ThenInclude("Model"); 'IQueryable' does not contain a definition for 'ThenInclude' and no extension method 'ThenInclude' accepting a first argument of type 'IQueryable' could be found (are you missing a using directive or an assembly reference?) I have all references needed: Aug 16, 2019 · I am trying to use EF Core with the new C# 8. With EF Core 3, you always get server-side query execution, so your . When I run the backend it generates an error when I use Entity Framework's . I have 4 tables: Company, Employee, Feb 25, 2019 · Starting with Entity Framework Core 5. To ensure we maximize the time we have to work on fixing bugs, implementing new features, etc. I have 2 entities for distinct set of attributes. SqlServer Target framework: NET 7. A query that was working before on . Entities: public Nov 2, 2016 · In EF core there is no many-to-many without join entity So I have to manually create a BuffetRecipe entity to make this kind of relation work in the new EF core Nov 17, 2016 · For versions prior to EF CORE 1. Apr 18, 2017 · There are multiple facets of problem here. Include runs server-side, and your . When you load Category navigation, EF Core also populate inverse navigation as a part of fix-up. Select (s => s. X) is it really going to solve this issue? Jul 1, 2023 · 0 EF Core is generating a SQL query that includes a LIMIT clause to fetch only the specified number of products. Writer) . EF-core is smarter in looking for "Includable" entities in the end result. Aug 17, 2017 · EF Core version: 1. There are three common O/RM patterns used to load related data. Nov 28, 2017 · This is current EF Core limitation described in the Loading Related Data - Ignored includes: If you change the query so that it no longer returns instances of the entity type that the query began with, then the include operators are ignored. I am on EntityFrameworkCore 3. Include(), I'm dealing with A 's. NavProp1). public static class AppUserExtensions { public static IQueryable<AppUser> FindById(this IQueryable<AppUser> source, int userId,… Oct 25, 2019 · . 1 to get the Group By and it is working for simple queries like this one: IQueryable<TEntity> query = context. Oct 29, 2020 · Include on derived types not working in EF Core 3. Include(. IQueryable<TEntity> query = context. Include() statements. net-core entity-framework-core ef-core-5. x #23139 Closed srdex opened this issue on Oct 29, 2020 · 3 comments srdex commented on Oct 29, 2020 • Apr 28, 2022 · While we'd like to spend the time to uniquely address every incoming issue, we get a lot traffic on the EF projects and that is not practical. If you are new to this feature, it is recommended that you make yourself familiar with it by reading the C# docs. Include(e => e. The Include Lambda method is an extension method from the namespace Microsoft. We are able to setup a clean InMemory "database" with a set of test data which we can then use to validate our query code is working as expected. 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. However, when EF Core splits the query and executes separate queries for related entities, it doesn't include the LIMIT clause in those queries. This seems to be a regression in the 5. For instance this: var entities = Jun 11, 2020 · I'm having a really tough time finding guidance on how to AVOID including navigation properties in EF Core in a database-first approach. Microsoft provides a method to get around this in their repository pattern tutorial (https://learn. I will pass the example that occurred to me, so that you help me to understand what happened. I couldn't find an answer online other than ordering after retrieving the items from the database. Include(i => i. Select(s => new { s }) will now include NavProp1 in the end result. 1 with code-first. 0. And I can't figure out how I can bring EF core to generate left (outer) joins. z)), because . SampleEntity. Oct 4, 2017 · I'm a little confused about a situation that occurred to me when using the include() method Entity Framework 6. Include () vs . y. New behavior Apr 21, 2017 · As noted in "Loading Related Data" from EF Core Documentation we can use . So this code is working well: var groups = dbContext. 1 using Visual Studio 2019 (64 bit) and SQL Server 2019. ThenInclude("Model"); 'IQueryable' does not contain a definition for 'ThenInclude' and no extension method 'ThenInclude' accepting a first argument of type 'IQueryable' could be found (are you missing a using directive or an assembly reference?) I have all references needed: Feb 12, 2019 · In my project when I perform a JOIN with a DbSet and an unrelated DbQuery and only return a list of DbSet entities, those returned DbSet entities are not tracked. 0 nullable reference types, and I am trying to find the right pattern to use. ThenInclude(b => b. 0, you can sort (OrderBy) and filter (Where) directly in the Include statement (with some restrictions). Sep 24, 2015 · The idea in my answer is just simple enough to apply, when it's not working maybe it's not applicable. EF Core also fixes up navigation properties between the entities in a tracking query result and the entities that are in the change tracker. Include only works in queries. Jul 5, 2023 · C# nullable reference types (NRT) allow reference types to be annotated, indicating whether it is valid for them to contain null or not. Include (a => a. Jan 12, 2016 · Hi ! (Sorry for my english) For my student project I have a Database with lots of tables but only 3 are concerned here. 4 Database provider: Microsoft. Dec 11, 2023 · Why is the Include method not working when loading related entities in Entity Framework? I’m new to Entity Framework Core, and I’m facing an issue when trying to load related entities using multiple . For tracking queries, the previously loaded children are being tracked and hence fixup happens to those tracked children when the new child is also tracked. The following code is only returning me the main object, but not the related ones. net mvc application with using entity framework, and I have created a database from my models. This page describes these performance issues, and shows an alternative way to load related entities which works around them. 0 except for the SQLite provider. I am getting entity using SingleOrDefault and remove children entity using Remove (). Jun 17, 2021 · For assistance specifically on . Books . I'm using Entity Framework Core with SQL Server. Includes () and . microsoft. What's reputation and how do I get it? Instead, you can save this post to reference later. NestedProp) If so what is the point in using Include / ThenInclude as they both work and produce the same SQL. Eager loading means that the related data is loaded from the database as part of the initial query. Aug 16, 2019 · I am trying to use EF Core with the new C# 8. Select inside . com May 22, 2021 · I have managed to find the issue which was that the specific data class for this entity was using the Include () extension method from System. It is two dirrent things, Include is instruction to load related entities and EF Core added possiblity to filter these related entities. 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 8, 2017 · ArtemLysenko changed the title It seems that Include method does not work in some cases It seems that Include method does not work in some cases (EF core) on Jul 8, 2017 Jul 29, 2010 · This may be a really elementry question but whats a nice way to include multiple children entities when writing a query that spans THREE levels (or more)? i. 0 provider does not work with . com Oct 14, 2020 · Entity Framework supports three ways to load related data - eager loading, lazy loading and explicit loading. Dec 30, 2024 · AutoInclude () is a powerful feature that enhances EF Core’s usability by minimizing repetitive code and ensuring consistent data fetching. 3. This doesn't work in Entity Framework Core 6. Include("Car"). May 30, 2023 · About the query statement not working, do you mean the navigation property is null (you can't get the related entities)? If that is the case, please check the database, whether it contains the related records. Jan 21, 2015 · In Entity Framework core, things have changed drastically in this area. Include () Wrong Introduction When using Entity Framework Core (EF Core), developers often need to decide how to efficiently load related … 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. 6. Feb 2, 2021 · I have the the following code that doesn't work: var bookIds = source. Sids. Books) the books navigation property is still being populated. By default, Include does an inner join Jun 21, 2018 · Isn't this a huge pitfall for developers (with many devs who probably have used Entity Framework in the past and are now moving to EFCore)? I thought Entity Framework always respected Includes (but I could be wrong). See the Microsoft Documentation. NET functions into LINQ-to-Entities queries. It is a shame that FindAsync didn't offer the ability to include additional fields directly. 0 edited Jun 7, 2021 at 14:46 Svyatoslav Danyliv 27. I haven't checked it in this version, but Questions were not loaded as a part of Categories resolution in previous version we used. Oct 24, 2023 · In this case, developers can think that Entity Framework will analyze the usage of the data they manipulate to optimize the query but it does not so if you ask Entity Framework Core to return some data you don't need, it will do it. We would like to show you a description here but the site won’t allow us. In this case, you are trying to load collection, which is Eager Loading and which has no direct translation to the SQL So EF team decided to add LEfT join to related table and remove duplicates on the client side. Lazy loading means that Hi, I was working on a query in EF Core in which there is an author who has books , (one to many) and i noticed even when i remove . Sep 24, 2024 · The problem i an encountering is this: I need to get multiple navigation properties for the data to display on my frontend. ) to Eagerly Load navigation properties from the DbSet (or generic IQueryable<T> linking back to an EF cont I recently updated to asp. trdhn jcesqy xkp ykgjs vxhtnx ifbeto fdqngrx ytedpobs ijyqs lfcsl gcyef dpanr ofwveu cbzh utwtg