C# entity framework get related entities

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WebMay 12, 2016 · So adding .ToList() would solve the issue as all entities are then retrieved from the DbContext before the iteration starts. foreach (Entities.Apointment app in apps.ToList()) // added ToList() If you wanted to materialize the list using async you could do. foreach (Entities.Apointment app in (await apps.ToListAsync())) Edit from comments WebJan 12, 2024 · Tracking, no-tracking and identity resolution. Using SQL queries. Asynchronous programming. Additional resources. Querying efficiently is a vast subject, that covers subjects as wide-ranging as indexes, related entity loading strategies, and many others. This section details some common themes for making your queries faster, and …

c# - How do I stop Entity Framework from trying to save/insert …

WebApr 9, 2024 · c#; entity-framework-core; google-cloud-spanner; Share. Improve this question. Follow edited yesterday. marc_s ... Validation failed for one or more entities while saving changes to SQL Server Database using Entity Framework. ... Entity Framework Core: DbContextOptionsBuilder does not contain a definition for 'usesqlserver' and no … WebOct 28, 2014 · context.Entry (reward).Collection (c => c.Campaigns).Load (); Manually Include () the Campaign property reward = context.Rewards.Include ("Campaigns") .SingleOrDefault (r => r.Id == reward.Id); Although, I'd suggest Load since you already have reward in memory. Check out the Loading Related Objects Section on this msdn doc for … tackling organised crime

c# - EF Core Select one Entity filtered by related entities - Stack ...

WebOct 12, 2024 · In this article. This topic will cover how to add and attach entities to a context and how Entity Framework processes these during SaveChanges. Entity Framework takes care of tracking the state of entities while they are connected to a context, but in disconnected or N-Tier scenarios you can let EF know what state your entities should be in. WebMar 16, 2024 · public IActionResult getAllProperties () { var properties = db.properties .Include (cat => cat.category) .ThenInclude (sub => sub.subCategory) .ThenInclude (sec => sec.SecondSubCategory) .Include (e => e.heating) .Include (e => e.type) .OrderByDescending (x => x.id) .ToList (); return Ok (properties); } Share Improve this … tackling outliers in granular box regression

c# - Loading all the children entities with entity framework

c# - Entity Framework not loading related objects - Stack Overflow

WebFeb 13, 2024 · public IQueryable GetQuery () where TEntity : class { var entityName = GetEntityName (); return _objectContext.CreateQuery (entityName); } public IList GetQueryWithInclude (string toInclude) where TEntity : class { var entityName = GetEntityName (); return _objectContext.CreateQuery (entityName).Include … WebIf child objects are not being populated when they are called in Entity Framework with Code First, there are a few things that you can check: Ensure that the child object is included in the query. You can use the Include method to specify which related entities to include in the query: tackling online child abuseWebOct 12, 2024 · The simplest way to use lazy-loading is by installing the Microsoft.EntityFrameworkCore.Proxies package and enabling it with a call to UseLazyLoadingProxies. For example: EF Core will then enable lazy loading for any navigation property that can be overridden--that is, it must be virtual and on a class that … tackling organized crime osrs

"WebYes, the entities that have been generated by EF. It would be interesting to see the definition of the Role property of your User entity. Go to the definition of your property (in Visual Studio, click on the property and press F12) then copy/paste it. Maybe be there is a problem with a navigation property. – ken2k Jan 6, 2012 at 16:14 " - C# entity framework get related entities

C# entity framework get related entities

Loading Related Entities - EF6 Microsoft Learn

Web20 hours ago · Each entity in the hierarchy additionally has a foreign key to the entity that is it's parent, as well as a collection of children entities. For example: public class BaseEntity { [Key] [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public Guid Id { get; set; } public DateTime CreatedOn { get; set; } public DateTime LastUpdate { get; set WebNov 8, 2013 · There are two ways to perform Eager Loading in Entity Framework: ObjectQuery.Include Method Explicit loading using either DbEntityEntry.Collection Method or DbEntityEntry.Reference Method along with their respective Load methods There are also manners to write Raw SQL Queries against database: DbSet.SqlQuery Method deals …

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WebApr 10, 2024 · One of the slower parts of a database query is the transfer of the data to your machine. So it is good practice to transfer only the data you plan to use. When you use LINQ in entity framework, using Queryable.Select is a good way to specify exactly what data you want to transfer. This is usually done just before your final ToList ... WebAug 19, 2012 · So when you are unpacking the task you should be able to get the related entity aswell. Things to check: The task entity should have the browse ability to the person entity else this will fail. Add the [Include] keyword on top of the person entities inside the metadata of task in the metadata file in your service layer.

WebJan 26, 2024 · 15 I can include only related entities. using (var context = new BloggingContext ()) { // Load all blogs, all related posts var blogs1 = context.Blogs .Include (b => b.Posts) .ToList (); } However, I don't need entire BlogPost entity. I'm interested only in particular properties, e.g: WebApr 7, 2024 · ...where I link to existing Dogs in my database by the list of DogIds, and then have Entity Framework "automatically" link those actual entities in the Dogs List so that myPets.Dogs.First() will actually give me the dog with the provided id 2.

WebNavigation properties are used by Entity Framework to navigate between related entities. Missing or incorrect mapping: Verify that the mapping between the database tables and … WebAug 22, 2014 · using (var ctx = new MyContext ()) { ctx.Parents.Attach (parent); ctx.Entry (parent).State = EntityState.Added; // or EntityState.Modified ctx.SaveChanges (); } The first line attaches the parent object and the whole graph of its dependent child objects to the context in Unchanged state.

WebJul 8, 2016 · You cannot nest calls that way. Include works on the core entity you are working with - that entity defines shape of the query so after you call Include(x => Wheels) you are still working with IQueryable and you cannot call extension method for IQueryable. You must again start with Car:

WebIf you are using Entity Framework 4.1 or later, you can use: var discussion = _repository.GetDiscussionCategory (id); // Count how many messages the discussion has var messageCount = context.Entry (discussion) .Collection (d => d.Messages) .Query () .Count (); Source: http://msdn.microsoft.com/en-US/data/jj574232 Share Improve this … tackling parp inhibitor resistanceWebMar 11, 2024 · Entity Framework Core allows you to use the navigation properties in your model to load related entities. There are three common O/RM patterns used to load … tackling paid patriotism reportWebIf you're using Entity Framework and the Include() method is not working within a complex query, there are a few things to check:. Check that you are using the Include() method correctly: Make sure that you are using the Include() method in the correct location in the query. The Include() method should be called on the DbSet object that represents the … tackling pads for footballWebJun 26, 2016 · 4 Answers. One cheap easy way of cloning an entity is to do something like this: var originalEntity = Context.MySet.AsNoTracking () .FirstOrDefault (e => e.Id == 1); Context.MySet.Add (originalEntity); Context.SaveChanges (); the trick here is AsNoTracking () - when you load an entity like this, your context do not know about it and when you ... tackling plasticsWebNov 29, 2011 · You can use Linq to Entities. You can match every object in entity1 and check if there is a corresponding data/object entity in entity2. using (NorthwindEntities … tackling period povertyWebIn Entity Framework, you can use the Include method to eagerly load related entities. However, if you have a hierarchy of related entities and you want to include all of them, … tackling perfectionismWebSorted by: 101. The best way to refresh entities in your context is to dispose your context and create a new one. If you really need to refresh some entity and you are using Code First approach with DbContext class, you can use. public static void ReloadEntity ( this DbContext context, TEntity entity) where TEntity : class { context ... tackling poverty action plan