Can a constructor be injected into an EF Core Entity?
EF Core can also inject “services” into an entity type’s constructor. For example, the following can be injected: Currently, only services known by EF Core can be injected. Support for injecting application services is being considered for a future release.
When to use Entity Framework for database initialization?
Initializing a database with Entity Framework is essential. It creates the database, tables and all constrains. In a previous article, we saw that is it possible to generate the database when the context specify to the database to initialize itself or when adding an entity to the database.
When to use static constructor in Entity Framework?
The static constructor is called before any constructors and is executed once. This is what we want. The reason is that in some of your application, you may initialize more than once the context. You do not want to execute all the process to check if the database if ready to be changed or not.
How to instantiate a dbcontext in EF Core?
These days the prefered method to add a DbContext to the service collection is to use the AddDbContextPool method: In EF Core it’s common to pass some DbContextOptions to the constructor. As you can see there, there is no valid overload in the form of a parameter-less constructor: .Net Core has IoC implemented in it’s roots.
When to use a default constructor in JavaScript?
If you don’t provide your own constructor, then a default constructor will be supplied for you. If your class is a base class, the default constructor is empty: If your class is a derived class, the default constructor calls the parent constructor, passing along any arguments that were provided:
Do you have to call the constructor of the parent class?
The default constructor then takes care of initializing the parent Error from the argument it is given. However, if you provide your own constructor, and your class derives from some parent class, then you must explicitly call the parent class constructor using super. For example:
Why does validationerror not need an explicit constructor?
That enables code like this to work: The ValidationError class doesn’t need an explicit constructor, because it doesn’t need to do any custom initialization. The default constructor then takes care of initializing the parent Error from the argument it is given.