Fluent API configurations are applied as code first is building the model from the classes. By using it, we can configure many different things, as it provides more configuration options than data annotation attributes. Download source - 1.13 MB; Introduction. As I understand it, you can either use Data Annotations against the properties within your Domain Model objects, or you can use a Fluent API, to define the properties data type (in the DB when the objects are created), … Pessoal, fico por aqui #dica! Data Annotations – Utiliza atributos para realizar o mapeamento e configuração; Fluent API – Fornece mais funcionalidades que o Data Annotations. Comments. Similar. Configuration enables you to override EF Core's default behaviour. The Data Annotations approach contains only two attributes related to relationships. It is a disadvantage of Data Annotations that, where complex validation is required, the model class can start to look somewhat cluttered; in contrast with Fluent Validation where the model stays nice and clean. Also, you may consider polluting your models with persistence logic such as database column names inappropriate. Uris don't have a default parameterless constructor, and no ID field. Data Annotation: Simple for basic scenarios; Integrates with MVC validation; It may support more features in the next version of EF. Fluent API provides more functionality for configuration than Data Annotations. You can use code first's fluent API instead of annotations to get the same client side & server side validation. Entity Framework Code First - Vantagens e desvantagens de Fluent Api vs Data Annotations [fechado] 120 . Using nullable reference types is recommended since it flows the nullability expressed in C# code to EF Core's model and to the database, and obviates the use of the Fluent API or Data Annotations to express the same concept twice. You can also apply attributes (known as Data Annotations) to your classes and properties. Entity Framework gives precedence to Fluent API over Data Annotations attributes. I would recommend the fluent API. Fluent API is an advanced way of specifying model configuration that covers everything that data annotations can do in addition to some more advanced configuration not possible with data annotations. Fluent API configures the following aspect of a model in Entity Framework 6: Model-wide Configuration: Configures the default Schema, entities to be excluded in … In this article we will read about the Fluent API. Data annotations will override conventions, but will be overridden by Fluent API configuration. Copy link Quote reply paradisehuman commented Dec 11, 2016. Data Annotations attributes are .NET attributes which can be applied to an entity class or properties to override default CodeFirst conventions in EF6 and EF Core. Data Annotations attributes are .NET attributes which can be applied to an entity class or properties to override default CodeFirst conventions in EF6 and EF Core. In Entity Framework Core, the ModelBuilder class acts as a Fluent API. I am new to Entity Framework and am about to embark on a new ASP.NET MVC project using EF5 Code First. The Entity Framework Core Fluent API HasKey method is used to denote the property that uniquely identifies an entity (the EntityKey), and which is mapped to the Primary Key field in a database: ... Composite keys are not covered by conventions or data annotation attributes. It is not possible to configure default database column values using data annotations. In Entity Framework Core, the ModelBuilder class acts as a Fluent API. The [ForeignKey] attribute allows us to define a foreign key for a navigational property in the model class. Rather than use Required, I'll show you this using a MaxLength validation. Quer melhorar esta questão? I don't think it's a risk - as both things have equivalent counterparts for the most of it. Categorias: Dica, Entity Framework Core CodeProject If you consider the DDD architecture designs, one thing you must fulfill that is isolation our Domain Model Layer. Data annotations and the fluent API can be used together, but Code First gives precedence to Fluent API > data annotations … EF Code First Data Annotations and Fluent API - Relationships for existing database Jul 18, 2017 02:31 PM | tapan2017 | LINK i am new in EF code first and not very fluent to configure various kind of relation between entities. On this page. But in my opinion you reach the limitations of DataAnnotations very quickly (except perhaps for extremely simple object models). Fluent API specify the model configuration that you can with data annotations as well as some additional functionality that can not be possible with data annotations. Fluent API: Flexibility. Minha dica é: Use sempre que possível Fluent API em suas aplicações! See the example of the Product class: Fluent Validation makes it easy for you to implement a conditional validation based on some field. Atualmente não está aceitando respostas. Specify metadata about that class or property to specify metadata about that class or property to specify metadata about class... Data Annotation attributes ID field things have equivalent counterparts for the most of it inappropriate. Applied as code First, Data Annotations are a subset of the box a subset of functionality! Categorias: dica, Entity Framework Fluent API on the other hand is a bit more complex to,... A Fluent API, depending on your preference values using Data Annotations do not support any kind of conditional.! 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