MVC validation 06-Custom error messages

Original: MVC validation 06-Custom Error message

This article experiences custom error messages.

System default error message

In MVC validation 02-Custom validation rules, message validation, we've customized a class that validates email. If the input message format is wrong, the system default error message appears.

Effect:

To modify the error message by errormessage

"email format error")]

"Mail")]

 Public string Email {get; set;}

Effect:

Overriding the Formaterrormessage method in a custom validation attribute

using System.ComponentModel.DataAnnotations;

using System.Text.RegularExpressions;

using SYSTEM.WEB.MVC;

namespace Mvcvalidation.extension

{

     Public Sealed class Emailattribute:validationattribute, iclientvalidatable

    {

         Public Const string @ "^[\w-]+ (\.[ \w-]+) *@ ([\w-]+\.) +[a-za-z]+$ ";

         Public Emailattribute ()

        {  

        }

        overriding base class methods

         Public Override BOOL IsValid (objectvalue)

        {

            if (valuenull)

                return true;

            if (valueisstring)

            {

                New Regex (REG);

                return regex.ismatch (value. ToString ());

            }

            return false;

        }

         Public System.collections.generic.ienumerable<modelclientvalidationrule> Getclientvalidationrules (ModelMetadata metadata, ControllerContext context)

        {

            New Modelclientvalidationrule

            {

                "Email",

                ErrorMessage = formaterrormessage (metadata. GetDisplayName ())

            };

            yield return rule;

        }

        <summary>

        Formatting error messages

        </summary>

        <param name= "Name" > property name </param>

        <returns></returns>

         Public Override string Formaterrormessage (string name)

        {

            return   This string. Format ("{0} attribute did not enter the correct email", name);

        }

    }

}

Effect: