Entity framework include virtual property

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August undefined, 2024

WebAug 13, 2016 · Using this I can get a product from the database and include its Category property. In my CategoryControllerI have this method: [Route ("api/Categories")] public IQueryable GetCategories () { return db.Categories .Include (c => c.Parent) .Include (c => c.Products) .Include (c => c.SubCategories); } WebFeb 13, 2024 · Here's an example of what I'm trying to achieve: public IQueryable GetQueryWithIncludes (string [] otherEntities) { var entityName = GetEntityName (); //now loop over the otherEntities array //and append Include extensions to the query //so inside the loop, something like: _objectContext.GetQuery (entityName).Include ...

c# - Entity Framework include property - Stack Overflow

WebFeb 26, 2024 · 6. WHERE [Extent1]. [CustomerId] = @EntityKeyValue1. Lazy loading is a great mechanism but only if you know when and how to use it. But look at our example again. Now if you look at this example, then you will see the select N+1 problem. The problem is happening because the Lazy loading is enabled by default and when we are … WebMar 29, 2024 · If any of the entity types sharing a table has a concurrency token then it must be included in all other entity types as well. This is necessary in order to avoid a stale concurrency token value when only one of the entities mapped to the same table is updated. dodea approved technology

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WebJul 13, 2012 · Existence of virtual keyword is related only to lazy loading. virtual keyword allows entity framework runtime create dynamic proxies for your entity classes and their properties, and by that support lazy loading. Without virtual, lazy loading will not be supported, and you get null on collection properties. WebApr 15, 2024 · To enable lazy loading ICollection property must be marked as virtual. so in your example, instead of: public ICollection Persons { get; set; } define it like this: public virtual ICollection Persons { get; set; } This article may be helpful: Entity Framework Loading Related Entities WebThe Entity Data Model (EDM) abstracts the logical or the relational schema and exposes the conceptual schema of the data using a three-layered approach i.e. The Conceptual Model (C- Space), Mapping model (C-S Space) Storage model (S – Space) Conceptual Model: The conceptual model contains the model classes (i.e. entities) and their … dodea and eas

Include property but exclude one of that property

c# - Navigation properties not loading properly - Stack Overflow

WebAug 27, 2024 · Lazy loading for virtual navigation property does not support in Entity Framework Core 2.0. It has been added in Entity Framework 2.1. So you have to upgrade your application to ASP.NET Core 2.1. Then install the Microsoft.EntityFrameworkCore.Proxies nuget package and configure it as follows in the … do dea agents work overseasWebFeb 11, 2012 · In object-oriented programming, a virtual property is a property whose behavior can be overridden within an inheriting class. This concept is an important part of the polymorphism portion of object-oriented programming (OOP). public class BaseClass { public int Id { get; set; } public virtual string Name { get; set; } } public class ... dodea annual training

"WebSep 10, 2024 · Entity framework will fill Students property (using a proxy) only if there is at least a student, else it will leave the property as is (null if you have not initialized it). When the entity is not a proxy, then Entity Framework tracks its changes only when calling SaveChanges () on the context, using its original entity state for comparison. " - Entity framework include virtual property

Entity framework include virtual property

c# - Get entity navigation properties after insert - Stack Overflow

WebFeb 12, 2024 · Answers. In the context of EF, marking a property as virtual allows EF to use lazy loading to load it. For lazy loading to work EF has to create a proxy object that overrides your virtual properties with an implementation that loads the referenced entity when it is first accessed. WebIf you include the library System.Data.Entity you can use an overload of the Include () method which takes a lambda expression instead of a string. You can then Select () over children with Linq expressions rather than string paths. return DatabaseContext.Applications .Include (a => a.Children.Select (c => c.ChildRelationshipType));

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WebMar 29, 2024 · If you find yourself doing this a lot, and the entity types in question are predominantly (or exclusively) used in EF Core queries, consider making the navigation properties non-nullable, and to configure them as optional via … WebThe fact is Mark's solution will work. Category cat = db.Categories .Include (c => c.Items.Select (s => s.Specifications)) .FirstOrDefault (c => c.Id == 1); Just wanted to make it clear that virtual has nothing to do with the problem. Yes, the Select part does the duty.

WebHowever on some occasions I would like to simply Include all navigation properties for an entity. Is there a method for this, or a way to do it? I'm assuming you could with reflection, but I would prefer to avoid that. What I know: var entity = db.Table.Include ("Navigation1").Include ("Navigation2").First (); What I want: WebIf you define your navigation property virtual, Entity Framework will at runtime create a new class (dynamic proxy) derived from your class and uses it instead of your original class. This new dynamically created class contains logic to load the navigation property when accessed for the first time. This is referred to as "lazy loading".

WebFeb 26, 2024 · include. In Entity Framework, the Include method loads the related objects to include in the query results. It can be used to retrieve some information from the database and also want to include related entities. We have a simple model which contains two entities. public class Book { public int Id { get; set; } public string Title { get; set ... WebSep 4, 2013 · public virtual IEnumerable Get ( Expression> filter = null, Func, IOrderedQueryable> orderBy = null, string [] includeProperties = null) { IQueryable query = dbSet; if (includeProperties != null) query = includeProperties.Aggregate (query, (q, s) => q.Include (s)); query = query.Where (x => !x.Deleted); if (filter != null) query = …

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WebThe takeaway is - do a bit of reflection magic (use marker interface for example to find your entities), iterate over all the virtual properties you grab from that, compose them into … exwell loughlinstownWebOct 28, 2014 · At most, it is going to set your primary key property if you're adding new objects. Your line reward = context.Set ().SingleOrDefault (a => a.Id == reward.Id); also does nothing in the way of loading Campaign because your reward object is not attached to the context. exwell medical tallaghtWebMar 4, 2024 · 1 Answer Sorted by: 4 An owned type will always be included when the parent is loaded. This feature is implemented by setting a property in your model, which you can set by hand for any navigation. modelBuilder.Entity () .Navigation (d => d.customerMapping) .AutoInclude (true); Share Improve this answer Follow answered … exwell.ie clontarfWebJun 1, 2014 at 10:24. 1. yes, the virtual keyword gives you two things : (1) LazyLoading yes or not... (2) it lets EntityFramework track on your properties ( EF can override the propeties once they are virtual) and this way it optimizing its queries, such as if only one field in a whole entity was change EF will know to update this field only ... ex wedgeWebWorking with metadata in EF Core is much easier than in previous EF versions. The DbContext class provides Model property which provides access to. The metadata about the shape of entities, the relationships between them, and how they map to the database. dodea aspen trainingWebDec 30, 2024 · The issue seems to be that you are trying to include 'Bank', which is 2 levels deep. The following should work: public IActionResult Index () { ICollection fixedDeposits = _unitOfWork.FD.GetAll (includeProperties: "Branch,Branch.Bank").ToList (); return View (fixedDeposits); } dodea credential teacherWebEntity Framework Core will automatically fix-up navigation properties to any other entities that were previously loaded into the context instance. 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. dodea cornerstone on demand