![]() ![]() Tableĭefault Code First convention creates a table name similar to the class name. If the user sets the Title which contains more than 24 characters, then EF will throw EntityValidationError. Public DateTime EnrollmentDate Įntity Framework also validates the value of a property for StringLength attribute. So to handle this, a Key attribute is added which will make it a primary key. ![]() Let’s take a look at the following code of a Student class which contains StdntID, but it doesn’t follow the default Code First convention. You can use the key annotation to specify which property is to be used as the EntityKey. When Code First does not find a property that matches this convention, it will throw an exception because of Entity Framework’s requirement that you must have a key property. Now let’s suppose Student class used the name StdntID instead of ID. The Student, Course and Enrollment classes follow this convention. The property will map to a primary key column in the database. One of the conventions that Code First depends on is how it implies which property is the key in each of the Code First classes.Ĭonvention is to look for a property named “Id” or one that combines the class name and “Id”, such as “StudentId”. namespace includes the following attributes that impacts the schema of the database.Įntity Framework relies on every entity having a key value that it uses for tracking entities. includes the following attributes that impacts the nullability or size of the column. DataAnnotation attributes override default CodeFirst conventions. NET applications, such as ASP.NET MVC which allows these applications to leverage the same annotations for client-side validations. DataAnnotations are also understood by a number of. DataAnnotations is used to configure the classes which will highlight the most commonly needed configurations.
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