BookId) will be the primary key for this entity class. A property with the name Id or Id (e.g.A property of NET type string will, by default, map to SQL NVARCHAR(max) NULL.By Convention: When you follow simple rules on property types and names, EF Core will autoconfigure many of the software and database features.The following figure shows the process that EF Core goes through the first time you use your application’s DbContext (later instances of your DbContext use a cached version of the created Model).ĮF Core uses three ways to pick up configure information NOTE: I cover the whole area of how to make changes to a database in the two articles Handling Entity Framework Core migrations: creating a migration – Part 1 and Handling Entity Framework Core migrations: applying a migration – Part 2 How EF Core’s Model of the database and the actual database need to match otherwise your application will fail when it tried to access the database. Just to be clear, it never looks at the actual database to build this Model it only uses the entity classes and any EF Core configuration commands you have added. At that point is creates a Model of the database you plan to access based on your entity classes mapped to the database and any EF Core configuration commands you have provided. When I talk about “configuring EF Core”, or “configure your DbContext” I’m talking about a process the EF Core does on the first use of your application’s DbContext. ![]() Public EfCoreContext(DbContextOptions options) The following listing is a very basic application’s DbContext without any extra configuration. In this class you add DbSet properties that set up the mapping between your classes (I refer to these as entity classes) and the database. To use EF Core you must create a class that inherits EF Core’s DbContext (I refer to this as your application’s DbContext). Setting the scene – what is happening when you configure your DbContext It allows you to define you own By Convention and have it applied to all classes/properties you have defined.
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