Get navigation properties in Entity Framework Core

Question

In EF6, this method works to retrieve an entity's navigation properties:

private List<PropertyInfo> GetNavigationProperties<T>(DbContext context) where T : class { var entityType = typeof(T); var elementType = ((IObjectContextAdapter)context).ObjectContext.CreateObjectSet<T>().EntitySet.ElementType; return elementType.NavigationProperties.Select(property => entityType.GetProperty(property.Name)).ToList(); }

IObjectContextAdapter however does not exist in EF Core. Where should I be looking to get the list of navigation properties of an entity?

Gert Arnold · Accepted Answer · 2018-01-03 09:42:09Z

Fortunately, access to the model data has become a lot easier in Entity Framework core. This is a way to list entity type names and their navigation property infos:

using Microsoft.EntityFrameworkCore; ... var modelData = db.Model.GetEntityTypes() .Select(t => new { t.ClrType.Name, NavigationProperties = t.GetNavigations().Select(x => x.PropertyInfo) });

... where db is a context instance.

You would probably like to use the overload GetEntityTypes(typeof(T)).

I think it is worth pointing out that the EF Core team has said that FindEntityType(Type) is not recommended to be used directly in your code because it could change. Here's a link

Sampath · Accepted Answer · 2022-04-20 07:36:12Z

EF core 6+

This works for me:

protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<Fare>().Navigation(f => f.Extras).AutoInclude(); }

Ref: https://learn.microsoft.com/en-us/ef/core/querying/related-data/eager#model-configuration-for-auto-including-navigations

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