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C# entity framework get related entities

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 ... 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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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 … 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: double glazing jobs in sussex https://3dlights.net

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WebApr 15, 2015 · EF is set up to allow Eager loading by using the .Include () function on your query, with lazy loading it can get messy if you start turning it on/off for various functions, you're better to just turn it off and manage what/when you want data loaded if you're feeling a need to turn it off. WebNov 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 … 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 … double glazing jobs scotland

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C# entity framework get related entities

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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. 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

C# entity framework get related entities

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WebIn 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, … 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 …

WebJun 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 ... 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 …

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 WebIf 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 …

WebMar 22, 2024 · For reference navigation properties you use simple criteria like: Where (entity => entity.Reference.SomeProperty == someValue) and for collection navigation properties, usually Any with the criteria needed, e.g.: Where (entity => entity.Collection.Any (related => related.SomeProperty == someValue)) in other words, I want records having …

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 … rack juegos ps3WebThe Load () method executes the SQL query in the database to get the data and fill up the specified reference or collection property in the memory, as shown below. Query () You can also write LINQ-to-Entities queries to … double glazing leadsWebJun 10, 2024 · here I am getting the type of the entity to get the navigation properties, then adding the name of each one to a list of string, then aggregating over the list to include each entity. then we can use this extension method like this: var record= await _context.Products.IncludeAllEntities(_context).FirstOrDefaultAsync(x => x.Id == key); double glazing leeming bar