WebSep 10, 2024 · Sep 10, 2024 at 13:32. 1. You should always initialize collection navigation properties inside constructor. In your example you should do: Students = new HashSet (); inside your Subject constructor (and, of course, keep the property as virtual ). – Federico Dipuma. WebEntity Framework child objects not populating. I have a simple model which when I run the website in the debugger the entity framework does not correctly populate the model. public class Team { /// /// Constructor required for the EntityFramework to create the object. /// private Team () { } public Team (string name ...
How to include a child object
WebJan 19, 2024 · The following example loads all blogs, their related posts, and the author of each post. C#. using (var context = new BloggingContext ()) { var blogs = context.Blogs .Include (blog => blog.Posts) .ThenInclude (post => post.Author) .ToList (); } You can chain multiple calls to ThenInclude to continue including further levels of related data. WebJul 25, 2024 · If change tracking is enabled, then when a query materializes an entity, EF Core will automatically set the navigation properties of the newly-loaded entity to refer to any entities already loaded, and set the navigation properties of the already-loaded entities to refer to the newly loaded entity. Querying related entities e post privat
c# - How to fill an ICollection inside an Entity
WebNov 25, 2015 · Option 2: EF can automatically fixup relationalship between entites without caling DbContext.SaveChanges () or DbContext.ChangeTracker.DetectChanges (). Those entites are called Proxy classes. A proxy class is a dynamically generated derived type that acts as a proxy for the entity. WebDec 7, 2024 · But, I am not able to populate child collection (Products of its own request id. If I use navigation property from Requests entity to populate Products, EF Core is automatically mapping products to its own Request ID. ... Select multiple nested levels of child tables in Entity Framework Core. 2. C# LINQ join with conditional where clause … WebDec 24, 2013 · Entity Framework core. Relationship fixup in Entity Framework core (2.1 at the time of writing) isn't affected by initialized reference navigation properties in constructors. That is, when users and addresses are pulled from the database separately, the navigation properties are populated. e post konto gratis