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; } }
}
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.IEnumerableGetClientValidationRules(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
@**@
.validation-summary-errors { color: red;
}
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;
});
@using (Html.BeginForm()) { @Html.AntiForgeryToken()
@Html.ValidationSummary(true)
@Html.LabelFor(model => model.Telephone)
@Html.EditorFor(model => model.Telephone)
@Html.ValidationMessageFor(model => model.Telephone)
@Html.LabelFor(model => model.Address)
@Html.EditorFor(model => model.Address)
@Html.ValidationMessageFor(model => model.Address)
}
□ 效果