Entity Framework StringLength Data Annotation

The StringLength attribute allows you to specify additional property validations like MaxLength.

• It is applied to a property to specify a maximum number of characters or bytes for the column that the property should map to.
• The only difference is that StringLength attribute can only be applied to a string type property of Domain classes.

The following example specifies that the Title column in the Books table has a maximum length of 12 characters.

public class Book
{
    public int BookId { get; set; }
    [StringLength(12)]
    public string Title { get; set; }
}

Try it

The StringLength attribute also allows you to specify a minimum acceptable length for a string.

public class Book
{
    public int BookId { get; set; }
    [StringLength(12, MinimumLength = 5)]
    public string Title { get; set; }
}

Try it

The MinimumLength has no effect on database configuration, but you can use it to provide a client-side validation in validation-aware UI frameworks, such as ASP.NET MVC.