MVC验证13-2个属性至少输入一项

有时候，我们希望2个属性中，至少有一个是必填，比如：

using Car.Test.Portal.Extension;

namespace Car.Test.Portal.Models

    public class Person

        public int Id { get; set; }

        public string Telephone { get; set; }

        public string Address { get; set; }

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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; }
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{
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.csharpcode .lnum { color: #606060; }

如果让Telephone和Address属性中，有一个是必填项，需要自定义特性。

□ 自定义AtLeastOneAttribute特性，派生于ValidationAttribute类，并实现IClientValidatable接口

using System;

using System.ComponentModel;

using System.ComponentModel.DataAnnotations;

using System.Globalization;

using System.Web.Mvc;

namespace Car.Test.Portal.Extension

    [AttributeUsage(AttributeTargets.Class, AllowMultiple = true, Inherited = true)]

    public sealed class AtLeastOneAttribute : ValidationAttribute, IClientValidatable

        public string PrimaryProperty { get; private set; }

        public string SecondaryProperty { get; private set; }

        public AtLeastOneAttribute(string primaryProperty, string secondProperty)

            PrimaryProperty = primaryProperty;

            SecondaryProperty = secondProperty;

        public override string FormatErrorMessage(string name)

            return string.Format(CultureInfo.CurrentCulture, this.ErrorMessageString, PrimaryProperty, SecondaryProperty);

        public override bool IsValid(object value)

            PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(value);

            object primaryValue = properties.Find(PrimaryProperty, true /* ignoreCase */).GetValue(value);

            object secondaryValue = properties.Find(SecondaryProperty, true /* ignoreCase */).GetValue(value);

            if (primaryValue != null || secondaryValue != null)

                return true;

            else

                return false;

            //return (primaryValue != null || secondaryValue != null);

            //稍稍改动以下还可以比较2个属性是否相等

            //if (!primaryValue.Equals(secondaryValue))

            //    return true;

            //else

            //    return false;

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

            string errorMessage = FormatErrorMessage("");

            ModelClientValidationRule rule = new ModelClientValidationRule()

                ValidationType = "atleastone",

                ErrorMessage = errorMessage

};

            rule.ValidationParameters.Add("primary", this.PrimaryProperty);

            rule.ValidationParameters.Add("secondary", this.SecondaryProperty);

            yield return rule;

□ 把自定义特性AtLeastOneAttribute打到类上

using Car.Test.Portal.Extension;

namespace Car.Test.Portal.Models

    [AtLeastOne("Telephone", "Address",ErrorMessage = "Telephone和Address至少填一项~~")]

    public class Person

        public int Id { get; set; }

        public string Telephone { get; set; }

        public string Address { get; set; }

□ PersonController

    public class PersonController : Controller

        public ActionResult Index()

            return View(new Person());

        [HttpPost]

        [ValidateAntiForgeryToken]

        public ActionResult Index(Person person)

            if (ModelState.IsValid)

                //TODO:

                return Content("ok");

            else

                return View(person);

□ Person/Index.cshtml

需要把自定义的特性注册到jquery相关类库中。

@model Car.Test.Portal.Models.Person

<body>

    <script src="~/Scripts/jquery-1.10.2.js"></script>

    <script src="~/Scripts/jquery-migrate-1.2.1.min.js"></script>

    <script src="~/Scripts/jquery.validate.min.js"></script>

    <script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>

    @*<script src="~/Scripts/atleastone.js"></script>*@

    <style type="text/css">

        .validation-summary-errors {

            color: red;

    </style>

    <script type="text/javascript">

        jQuery.validator.addMethod("atleastone", function (value, element, params) {

            var primaryProperty = params.primary;

            var secondaryProperty = params.secondary;

            if (primaryProperty.length > 0 || secondaryProperty.length > 0) {

                return true;

            } else {

                return false;

});

        jQuery.validator.unobtrusive.adapters.add("atleastone", ["primary", "secondary"], function (options) {

            options.rules["atleastone"] = {

                primary: options.params.primary,

                secondary: options.params.secondary

};

            options.messages["atleastone"] = options.message;

});

    </script>

    @using (Html.BeginForm()) {

        @Html.AntiForgeryToken()

        @Html.ValidationSummary(true)

        <fieldset>

            <legend>Person</legend>

            <div class="editor-label">

                @Html.LabelFor(model => model.Telephone)

            </div>

            <div class="editor-field">

                @Html.EditorFor(model => model.Telephone)

                @Html.ValidationMessageFor(model => model.Telephone)

            </div>

            <div class="editor-label">

                @Html.LabelFor(model => model.Address)

            </div>

            <div class="editor-field">

                @Html.EditorFor(model => model.Address)

                @Html.ValidationMessageFor(model => model.Address)

            </div>

<p>

                <input type="submit" value="Create" />

            </p>

        </fieldset>

</body>

</html>

□ 效果

巴特西

MVC验证13-2个属性至少输入一项

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