我试图根据复选框的值来验证文本框。请查看我的模型类和IsValid重写方法。
public class Product
{
//Below property value(HaveExperiance)
[MustBeProductEntered(HaveExperiance)]
public string ProductName { get; set; }
public bool HaveExperiance { get; set; }
}
public class MustBeTrueAttribute : ValidationAttribute
{
//Here i need the value of HaveExperiance property which
//i passed from [MustBeProductEntered(HaveExperiance)] in product class above.
public override bool IsValid(object value)
{
return value is bool && (bool)value;
}
}
您可以在上面的类的ProductName
属性中product
尝试访问HaveExperiance
该类的属性值,如果选中,则用户必须填写ProductName
文本框。
所以我的原始问题是,我如何才能ProductName
基于HaveExperiance
值验证文本框,请先感谢。
编辑:
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Data.Entity;
using System.Linq;
using System.Reflection;
using System.Web;
using System.Web.Mvc;
namespace Mvc.Affiliates.Models
{
public class MyProducts
{
[Key]
[Required(ErrorMessage = "Please insert product id.")]
public string ProductId { get; set; }
[RequiredIf("HaveExperiance")]
public string ProductName { get; set; }
public bool HaveExperiance { get; set; }
public List<MyProducts> prolist { get; set; }
}
public class RequiredIfAttribute : ValidationAttribute
{
private RequiredAttribute _innerAttribute = new RequiredAttribute();
public string Property { get; set; }
public object Value { get; set; }
public RequiredIfAttribute(string typeProperty)
{
Property = typeProperty;
}
public RequiredIfAttribute(string typeProperty, object value)
{
Property = typeProperty;
Value = value;
}
public override bool IsValid(object value)
{
return _innerAttribute.IsValid(value);
}
}
public class RequiredIfValidator : DataAnnotationsModelValidator<RequiredIfAttribute>
{
public RequiredIfValidator(ModelMetadata metadata, ControllerContext context, RequiredIfAttribute attribute) : base(metadata, context, attribute) { }
public override IEnumerable<ModelClientValidationRule> GetClientValidationRules()
{
return base.GetClientValidationRules();
}
public override IEnumerable<ModelValidationResult> Validate(object container)
{
PropertyInfo field = Metadata.ContainerType.GetProperty(Attribute.Property);
if (field != null)
{
var value = field.GetValue(container, null);
if ((value != null && Attribute.Value == null) || (value != null && value.Equals(Attribute.Value)))
{
if (!Attribute.IsValid(Metadata.Model))
{
yield return new ModelValidationResult { Message = ErrorMessage };
}
}
}
}
}
控制器
public class HomeController : Controller
{
//
// GET: /Home/
MvcDbContext _db = new MvcDbContext();
public ActionResult Index()
{
return View();
}
[HttpPost]
public ActionResult Index(MyProducts model)
{
string ProductId = model.ProductId;
string ProductName = model.ProductName;
//bool remember = model.HaveExperiance;
return View();
}
}
看法
@model Mvc.Affiliates.Models.MyProducts
@{
ViewBag.Title = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Details</h2>
<br />
<div style="height:200px; width:100%">
@using (Html.BeginForm("Index","Home", FormMethod.Post))
{
<h2>Details</h2>
@Html.LabelFor(model => model.ProductId)
@Html.TextBoxFor(model => model.ProductId)
@Html.LabelFor(model => model.ProductName)
@Html.EditorFor(model => model.ProductName)
@Html.ValidationMessageFor(model => model.ProductName, "*")
@Html.CheckBoxFor(model => model.HaveExperiance)
@Html.ValidationMessageFor(model => model.HaveExperiance, "*")
<input type="submit" value="Submit" />
}
</div>
到目前为止,我已经尝试了上面的代码,实际上,当我单击复选框时,我需要它,然后它应该开始验证我的ProductName文本框,如果取消选中则不行。我在上面的代码中缺少一点东西,请帮助纠正我。
这是一个如何基于另一个属性创建自定义验证属性的完整示例:
public class RequiredIfAttribute : ValidationAttribute
{
private RequiredAttribute _innerAttribute = new RequiredAttribute();
public string Property { get; set; }
public object Value { get; set; }
public RequiredIfAttribute(string typeProperty) {
Property = typeProperty;
}
public RequiredIfAttribute(string typeProperty, object value)
{
Property = typeProperty;
Value = value;
}
public override bool IsValid(object value)
{
return _innerAttribute.IsValid(value);
}
}
public class RequiredIfValidator : DataAnnotationsModelValidator<RequiredIfAttribute>
{
public RequiredIfValidator(ModelMetadata metadata, ControllerContext context, RequiredIfAttribute attribute) : base(metadata, context, attribute) { }
public override IEnumerable<ModelClientValidationRule> GetClientValidationRules()
{
return base.GetClientValidationRules();
}
public override IEnumerable<ModelValidationResult> Validate(object container)
{
PropertyInfo field = Metadata.ContainerType.GetProperty(Attribute.Property);
if (field != null) {
var value = field.GetValue(container, null);
if ((value != null && Attribute.Value == null) || (value != null && value.Equals(Attribute.Value))) {
if (!Attribute.IsValid(Metadata.Model)) {
yield return new ModelValidationResult { Message = ErrorMessage };
}
}
}
}
}
在Global.asax
文件中Application_Start
添加以下部分:
DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof(RequiredIfAttribute), typeof(RequiredIfValidator));
这部分需要重新注册,RequiredIfValidator
否则MVC将仅使用RequiredIfAttribute
忽略RequiredIfValidator
。
如果要验证ProductName
是否HaveExperiance
具有值:
[RequiredIf("HaveExperiance")]
public string ProductName { get; set; }
如果您只想验证ProductName
是否HaveExperiance
为false:
[RequiredIf("HaveExperiance", false)]
public string ProductName { get; set; }
如果只想验证ProductName
是否HaveExperiance
为true:
[RequiredIf("HaveExperiance", true)]
public string ProductName { get; set; }
在RequiredIfAttribute
课堂上,我创建了一个RequiredAttribute
对象,仅用于验证传递给IsValid
方法的值。
Property
字段用于保存激活验证的属性的名称。它在类中RequiredIfValidator
用于通过反射(field.GetValue(container, null)
)获取励磁电流值。
当您在代码中调用验证时(例如,当您执行时if(TryValidateModel(model))
),您首先调用RequiredIfValidator
类,然后在某些条件有效的情况下RequiredIfAttribute
通过调用类。Attribute.IsValid(Metadata.Model)
(value != null && Attribute.Value == null) || (value != null && value.Equals(Attribute.Value))
最后一件事。因为RequiredIfAttribute
从ValidationAttribute
您那里继承,您也可以使用错误消息,就像使用其他任何验证属性一样。
[RequiredIf("HaveExperiance", true, ErrorMessage = "The error message")]
public string ProductName { get; set; }
[RequiredIf("HaveExperiance", true, ErrorMessageResourceName = "ResourceName", ErrorMessageResourceType = typeof(YourResourceType))]
public string ProductName { get; set; }
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