MVC验证06-自定义错误信息

[Email(ErrorMessage = "Email格式错误")]

[Display(Name = "邮件")]

public string Email { get; set; }

using System.ComponentModel.DataAnnotations;

using System.Text.RegularExpressions;

using System.Web.Mvc;

namespace MvcValidation.Extension

{

    public sealed class EmailAttribute : ValidationAttribute, IClientValidatable

    {

        public const string reg = @"^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]+$";

        public EmailAttribute()

        {  

        }

        //重写基类方法

        public override bool IsValid(object value)

        {

            if (value == null)

                return true;

            if (value is string)

            {

                Regex regEx = new Regex(reg);

                return regEx.IsMatch(value.ToString());

            }

            return false;

        }

        public System.Collections.Generic.IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)

        {

            ModelClientValidationRule rule = new ModelClientValidationRule

            {

                ValidationType = "email",

                ErrorMessage = FormatErrorMessage(metadata.GetDisplayName())

            };

            yield return rule;

        }

        /// <summary>

        /// 格式化错误信息

        /// </summary>

        /// <param name="name">属性名</param>

        /// <returns></returns>

        public override string FormatErrorMessage(string name)

        {

            return  this.ErrorMessage ?? string.Format("{0}属性没有输入正确的Email", name);

        }

    }

}