MVC验证06-自定义错误信息

原文:MVC验证06-自定义错误信息

本文体验自定义错误信息。

  系统默认的错误信息

在"MVC验证02-自定义验证规则、邮件验证"中，我们自定义了一个验证Email的类。如果输入邮件格式错误，出现系统默认的报错信息。

效果：
             

 

  通过ErrorMessage来修改错误信息

[Email(ErrorMessage = "Email格式错误")]

[Display(Name = "邮件")]

public string Email { get; set; }

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

效果：

  在自定义验证特性中重写FormatErrorMessage方法

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);

        }

    }

}

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

效果：