2009-11-07 Data Annotations

2009-11-07 data-annotations

# Title: Data Annotations
# Author: Mikael Lundin
# Link: http://blog.mikaellundin.name/2009/11/07/data-annotations.html

Example1.cs

var person = new Person
{
    Name = "John Doe",
    Age = 54,
    Email = "[email protected]"
};

/* Validate */
var result = person.ValidateAnnotations();

IPerson.cs

[MetadataType(typeof(IPerson))]
public class Person : IPerson
{
    public string Name { get; set; }

    public int Age { get; set; }

    public string Email { get; set; }
}

public interface IPerson
{
    [StringLength(20), Required(ErrorMessage = "Name is a required property")]
    string Name { get; set; }

    [Range(0, 150)]
    int Age { get; set; }

    [RegularExpression(@"(?i:^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$)")]
    string Email { get; set; }
}

Person.cs

public class Person
{
    [StringLength(20), Required(ErrorMessage = "Name is a required property")]
    public string Name { get; set; }

    [Range(0, 150)]
    public int Age { get; set; }

    [RegularExpression(@"(?i:^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$)")]
    public string Email { get; set; }
}