![]() EF Core uses a DbContextOptionsBuilder, which supports several helpful extension methods to streamline its configuration. In your ASP.NET Core application, you'll typically configure EF Core in Program.cs with your application's other dependencies. If you have only one DbContext in your application, you can pass an instance of DbContextOptions, but if you have more than one you must use the generic DbContextOptions type, passing in your DbContext type as the generic parameter. Your DbContext must have a constructor that accepts DbContextOptions and pass this argument to the base DbContext constructor. Public CatalogContext(DbContextOptions options) : base(options) The eShopOnWeb sample includes a CatalogContext with collections for items, brands, and types: public class CatalogContext : DbContext ![]() This class holds properties representing collections of the entities your application will work with. To work with EF Core, you need a subclass of DbContext. To add support for an InMemory data source, for testing: dotnet add package To use EF Core with a SQL Server database, run the following dotnet CLI command: dotnet add package You add it to your application as a NuGet package, configure it during app startup, and request it through dependency injection wherever you need it. Like ASP.NET Core, EF Core has been rewritten from the ground up to support modular cross-platform applications. It eliminates the need for most of the data access code developers would typically need to write. NET developers to persist objects to and from a data source. EF Core is an object-relational mapper (O/RM) that enables. If you're writing a new ASP.NET Core application that needs to work with relational data, then Entity Framework Core (EF Core) is the recommended way for your application to access its data. ![]() Entity Framework Core (for relational databases) Abstracting these choices from the ApplicationCore and UI projects, and encapsulating implementation details in Infrastructure, helps to produce loosely coupled, testable software. The choice of which data access framework to use depends on the application's needs. ASP.NET Core supports various data access options, including Entity Framework Core (and Entity Framework 6 as well), and can work with any. "Data is a precious thing and will last longer than the systems themselves."ĭata access is an important part of almost any software application. ![]()
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