Entity Framework Code-First(9.4):DataAnnotations - Required Attribute

追憶似水流年發表於2016-07-05

Required attribute can be applied to a property of a domain class. EF Code-First will create a NOT NULL column in a database table for a property on which we apply Required attribute. Note that it can also be used with ASP.Net MVC as a validation attribute.

Consider the following example.

using System.ComponentModel.DataAnnotations;
    
public class Student
{
    public Student()
    { 
        
    }
    public int StudentID { get; set; }
     
    [Required]
    public string StudentName { get; set; }
        
}

 

As you can see in the above code, we have applied Required attribute to StudentName. So, Code First will create a NOT NULL StudentName column in the Student table as shown below.

dataannotations required attribute

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