There are various validations that are used in
ASP.NET MVC application .Among them Data Annotation Validators is one of the
beneficial validator that can be used in ASP.NET MVC application to apply
validations .To use this tool user must have Data Annotations Model Binder but
Data Annotations Model Binder is not an official part of the Microsoft ASP.NET
MVC framework .
Advantage of using Data Annotation
Validators :
It helps the user to perform validation simply by adding attribute directly to a
Class Property like to perform validation on any string to bound its length than
just use a simple attribute StingLenght to do so.
Data Annotation Validators Attribute are:
- Range – To check weather a value of
property falls under the specified range of values.
- ReqularExpression – To check whether
the value of a property matches a specified regular expression pattern.
- Required –It enables the user to
mark a property as required.
- StringLength – It helps the user to
specify a maximum length for a string property.
- Validation – It is the class for all
validator attributes.
Sample Code to show the use of Data
Annotaion Validators
using
System;
using
System.Collections.Generic;
using
System.ComponentModel;
using
System.ComponentModel.DataAnnotations;
using
System.Globalization;
using
System.Linq;
using
System.Web;
using
System.Web.Mvc;
using
System.Web.Security;
namespace
MvcApplication3.Models
{
public class
Product
{
public int Id {
get; set;
[Required]
[StringLength(20)]
public string Name {
get; set;
[Required]
public string Type {
get; set;
[DisplayName("Cost")]
[Required]
[RegularExpression(@"^\$?\d+(\.(\d{2}))?$")]
public decimal Cost {
get; set; }
}
}
In the above example validation are
applied on Name, Type and Cost properties are checked as per
requirement . As Name property is restricted with the string length or the
number of characters must be less than 20.And the Cost property must match a
regular expression pattern that are specified by the user.