MVC驗證05-自定義驗證規則、驗證2個屬性值不等

本文體驗2個屬性值不等。即當一個屬性輸入值，另外一個屬性輸入的值不能和第一個屬性值相等。相關文章包括：

MVC驗證01-基礎、遠端驗證  
MVC驗證02-自定義驗證規則、郵件驗證  
MVC驗證03-自定義驗證規則、禁止輸入某些值  
MVC驗證04-自定義驗證規則、日期範圍驗證 

 

  自定義驗證特性，繼承ValidationAttribute並實現IClientValidatable

這次重寫了基類的IsValid()方法的另外一個過載，因為該過載包含了驗證上下文ValidationContext，從中可以獲取屬性及屬性值。

using System.ComponentModel.DataAnnotations;
using System.Globalization;
using System.Web.Mvc;

namespace MvcValidation.Extension
{
    public class NotEqualToAttribute : ValidationAttribute,IClientValidatable
    {
        public string OtherProperty { get; set; }

        public NotEqualToAttribute(string otherProperty)
        {
            OtherProperty = otherProperty;
        }

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            //從驗證上下文中可以獲取我們想要的的屬性
            var property = validationContext.ObjectType.GetProperty(OtherProperty);
            if (property == null)
            {
                return new ValidationResult(string.Format(CultureInfo.CurrentCulture, "{0} 不存在", OtherProperty));
            }

            //獲取屬性的值
            var otherValue = property.GetValue(validationContext.ObjectInstance, null);
            if (object.Equals(value, otherValue))
            {
                return new ValidationResult(FormatErrorMessage(validationContext.DisplayName));
            }
            return null;
        }

        public System.Collections.Generic.IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
        {
            var rule = new ModelClientValidationRule
            {
                ValidationType = "notequalto",
                ErrorMessage = FormatErrorMessage(metadata.GetDisplayName())
            };
            rule.ValidationParameters["other"] = OtherProperty;
            yield return rule;
        }
    }
}

  View model

[NotEqualTo("UserName", ErrorMessage = "不能與使用者名稱的值相同")]用來比較屬性UserName的值。

 public class RegisterModel
    {
        [Required]
        [StringLength(6, MinimumLength = 2)] //加
        [Display(Name = "使用者名稱")]
        //[Remote("CheckUserName","Validate", ErrorMessage = "遠端驗證使用者名稱失敗")]
        [NoInput("demo,jack",ErrorMessage = "不能使用此名稱")]
        public string UserName { get; set; }

        [Required]
        [DataType(DataType.EmailAddress)]
        [Display(Name = "郵件")]
        //[Email]
        public string Email { get; set; }

        [Required]
        [StringLength(100, ErrorMessage = "{0}欄位最少{2}個字，最多{1}個字", MinimumLength = 6)]
        [DataType(DataType.Password)]
        [Display(Name = "密碼")]
        public string Password { get; set; }

        [DataType(DataType.Password)]
        [Display(Name = "確認密碼")]
        [System.ComponentModel.DataAnnotations.Compare("Password", ErrorMessage = "密碼和確認密碼不匹配。")]
        public string ConfirmPassword { get; set; }

        [NotEqualTo("UserName", ErrorMessage = "不能與使用者名稱的值相同")]
        public string OtherName { get; set; }
    }

  擴充套件jquery的驗證，jQuery.validator.noteaualto.js

jQuery.validator.addMethod('notEaualTo', function(value, element, param) {
    //意思是表單值為空時也能通過驗證
    //但，如果表單有值，就必須滿足||後面的條件，否則返回false
    return this.optional(element) || value != $(param).val();
});

//第一個引數是jquery驗證擴充套件方法名
//第二個引數與rule.ValidationParameters["other"]中的key對應
//option是指ModelClientValidationRule物件例項
jQuery.validator.unobtrusive.adapters.add('notequalto', ['other'], function(options) {
    options.rules['notEqualTo'] = '#' + options.params.other;
    if (options.message) {
        options.messages['notEqualTo'] = options.message;
    }
});

 

  Register.cshtml檢視

@model MvcValidation.Models.RegisterModel
@{
    ViewBag.Title = "註冊";
}

<hgroup class="title">
    <h1>@ViewBag.Title.</h1>
    <h2>建立新帳戶。</h2>
</hgroup>

@using (Html.BeginForm()) {
    @Html.AntiForgeryToken()
    @Html.ValidationSummary()

    <fieldset>
        <legend>登錄檔單</legend>
        <ol>
            <li>
                @Html.LabelFor(m => m.UserName)
                @Html.TextBoxFor(m => m.UserName)
            </li>
            <li>
                @Html.LabelFor(m => m.Email)
                @Html.TextBoxFor(m => m.Email)
            </li>
            <li>
                @Html.LabelFor(m => m.Password)
                @Html.PasswordFor(m => m.Password)
            </li>
            <li>
                @Html.LabelFor(m => m.ConfirmPassword)
                @Html.PasswordFor(m => m.ConfirmPassword)
            </li>
            <li>
                @Html.LabelFor(m => m.OtherName)
                @Html.TextBoxFor(m => m.OtherName)
            </li>
        </ol>
        <input type="submit" value="註冊" />
    </fieldset>
}

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
    <script src="~/Scripts/jQuery.validator.noteaualto.js"></script>
}

效果：