Data annotations will override conventions, but will be overridden by Fluent API configuration. You can also apply certain attributes (known as Data Annotations) to your classes and properties. Use data annotations to configure a model Entity types must be added to the model before the attribute will be discovered on that entity type. Or by registering it in OnModelCreating: protected override void OnModelCreating(ModelBuilder modelBuilder)ĮntityTypeConfigurationAttribute types will not be automatically discovered in an assembly. For example, by creating a DbSet property for the entity type: public class BooksContext : DbContext The entity type is included in a model using one of the normal mechanisms. This attribute means that EF Core will use the specified IEntityTypeConfiguration implementation whenever the Book entity type is included in a model. Rather than explicitly calling Configure, an EntityTypeConfigurationAttribute can instead be placed on the entity type such that EF Core can find and use appropriate configuration. Using EntityTypeConfigurationAttribute on entity types The order in which the configurations will be applied is undefined, therefore this method should only be used when the order doesn't matter. Protected override void OnModelCreating(ModelBuilder modelBuilder) The configuration is applied in the order the methods are called and if there are any conflicts the latest call will override previously specified configuration. Fluent API configuration has the highest precedence and will override conventions and data annotations. This is the most powerful method of configuration and allows configuration to be specified without modifying your entity classes. You can override the OnModelCreating method in your derived context and use the fluent API to configure your model. You can view this article's samples on GitHub.
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