我正在寻找关于实现执行以下操作的验证属性的最佳方法的一些建议。
模型
public class MyInputModel
{
[Required]
public int Id {get;set;}
public string MyProperty1 {get;set;}
public string MyProperty2 {get;set;}
public bool MyProperty3 {get;set;}
}
我想使用一个值至少为prop1 prop2 prop3，如果prop3是填充它的唯一值，则它不应该等于false。 我将如何为此编写验证属性（s？）？
感谢您的帮助！
答案 0 :(得分：84)
昨天我遇到了同样的问题，但是我以一种非常干净的方式做到了这一点，它适用于客户端和服务器端验证。
条件：根据模型中其他属性的值，您需要创建另一个属性。这是代码
public class RequiredIfAttribute : RequiredAttribute
{
private String PropertyName { get; set; }
private Object DesiredValue { get; set; }
public RequiredIfAttribute(String propertyName, Object desiredvalue)
{
PropertyName = propertyName;
DesiredValue = desiredvalue;
}
protected override ValidationResult IsValid(object value, ValidationContext context)
{
Object instance = context.ObjectInstance;
Type type = instance.GetType();
Object proprtyvalue = type.GetProperty(PropertyName).GetValue(instance, null);
if (proprtyvalue.ToString() == DesiredValue.ToString())
{
ValidationResult result = base.IsValid(value, context);
return result;
}
return ValidationResult.Success;
}
}
PropertyName 是您想要使您的条件成为的财产
DesiredValue 是PropertyName（属性）的特定值，您的其他属性必须根据需要进行验证
说你有以下内容：
public enum UserType
{
Admin,
Regular
}
public class User
{
public UserType UserType {get;set;}
[RequiredIf("UserType",UserType.Admin,
ErrorMessageResourceName="PasswordRequired",
ErrorMessageResourceType = typeof(ResourceString))
public string Password
{ get; set; }
}
最后但并非最不重要的是，为您的属性注册适配器，以便它可以进行客户端验证（我把它放在global.asax，Application_Start中）
DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof(RequiredIfAttribute),
typeof(RequiredAttributeAdapter));
EDITED
有些人抱怨无论什么或不起作用，客户端都会发火。所以我修改了上面的代码，用javascript做了条件客户端验证。对于这种情况，您不需要注册适配器
public class RequiredIfAttribute : ValidationAttribute, IClientValidatable
{
private String PropertyName { get; set; }
private Object DesiredValue { get; set; }
private readonly RequiredAttribute _innerAttribute;
public RequiredIfAttribute(String propertyName, Object desiredvalue)
{
PropertyName = propertyName;
DesiredValue = desiredvalue;
_innerAttribute = new RequiredAttribute();
}
protected override ValidationResult IsValid(object value, ValidationContext context)
{
var dependentValue = context.ObjectInstance.GetType().GetProperty(PropertyName).GetValue(context.ObjectInstance, null);
if (dependentValue.ToString() == DesiredValue.ToString())
{
if (!_innerAttribute.IsValid(value))
{
return new ValidationResult(FormatErrorMessage(context.DisplayName), new[] { context.MemberName });
}
}
return ValidationResult.Success;
}
public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
{
var rule = new ModelClientValidationRule
{
ErrorMessage = ErrorMessageString,
ValidationType = "requiredif",
};
rule.ValidationParameters["dependentproperty"] = (context as ViewContext).ViewData.TemplateInfo.GetFullHtmlFieldId(PropertyName);
rule.ValidationParameters["desiredvalue"] = DesiredValue is bool ? DesiredValue.ToString().ToLower() : DesiredValue;
yield return rule;
}
}
最后是javascript（捆绑它和renderit ......把它放在自己的脚本文件中）
$.validator.unobtrusive.adapters.add('requiredif', ['dependentproperty', 'desiredvalue'], function (options) {
options.rules['requiredif'] = options.params;
options.messages['requiredif'] = options.message;
});
$.validator.addMethod('requiredif', function (value, element, parameters) {
var desiredvalue = parameters.desiredvalue;
desiredvalue = (desiredvalue == null ? '' : desiredvalue).toString();
var controlType = $("input[id$='" + parameters.dependentproperty + "']").attr("type");
var actualvalue = {}
if (controlType == "checkbox" || controlType == "radio") {
var control = $("input[id$='" + parameters.dependentproperty + "']:checked");
actualvalue = control.val();
} else {
actualvalue = $("#" + parameters.dependentproperty).val();
}
if ($.trim(desiredvalue).toLowerCase() === $.trim(actualvalue).toLocaleLowerCase()) {
var isValid = $.validator.methods.required.call(this, value, element, parameters);
return isValid;
}
return true;
});
显然，你需要将不引人注意的验证jquery作为要求包含在内
答案 1 :(得分：29)
我知道这个话题是在前一段时间被问过的，但最近我遇到了类似的问题并发现了另一个问题，但在我看来，这是一个更完整的解决方案。我决定实现提供条件属性的机制，以根据逻辑表达式中定义的其他属性值和它们之间的关系来计算验证结果。
使用它，您可以通过以下方式获得您所询问的结果：
[RequiredIf("MyProperty2 == null && MyProperty3 == false")]
public string MyProperty1 { get; set; }
[RequiredIf("MyProperty1 == null && MyProperty3 == false")]
public string MyProperty2 { get; set; }
[AssertThat("MyProperty1 != null || MyProperty2 != null || MyProperty3 == true")]
public bool MyProperty3 { get; set; }
有关ExpressiveAnnotations库can be found here的更多信息。它应简化许多声明性验证案例，而无需在控制器内部编写其他特定于案例的属性或使用命令式验证方法。
答案 2 :(得分：6)
我看到很多人对这段代码感兴趣并且感到很痛苦，我知道它第一次真的让人感到困惑和破坏。
＆＃34; System.Web.Mvc.RequiredAttributeAdapter类型必须具有公共构造函数，该构造函数接受System.Web.Mvc.ModelMetadata，System.Web.Mvc.ControllerContext和ExpressiveAnnotations.Attributes.RequiredIfAttribute参数类型的三个参数。 name：adapterType＆＃34;
提示＃1：请确保您继承自 ValidationAttribute ＆＃39;不是来自＆＃39; RequiredAttribute ＆＃39;
public class RequiredIfAttribute : ValidationAttribute, IClientValidatable { ...}
提示＃2：或从＆＃39; Global.asax ＆＃39;中删除整行，在较新版本中根本不需要代码（在@Dan_Hunex编辑之后），是的，这一行在旧版本中是必须的......
DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof(RequiredIfAttribute), typeof(RequiredAttributeAdapter));
1-将代码放入新的js文件中（例如：requiredIfValidator.js）
2-扭曲$（文档）中的代码.ready（function（）{........}）;
3-在包含JQuery验证库之后包含我们的js文件，所以它现在看起来像这样：
@Scripts.Render("~/bundles/jqueryval")
<script src="~/Content/JS/requiredIfValidator.js"></script>
4-编辑C＃代码
这
rule.ValidationParameters["dependentproperty"] = (context as ViewContext).ViewData.TemplateInfo.GetFullHtmlFieldId(PropertyName);
到
rule.ValidationParameters["dependentproperty"] = PropertyName;
和
if (dependentValue.ToString() == DesiredValue.ToString())
到
if (dependentValue != null && dependentValue.ToString() == DesiredValue.ToString())
<强> Global.asax中
此处无需添加任何内容，请保持清洁
<强> requiredIfValidator.js
在〜/ content或〜/ scripts文件夹
中创建此文件 $.validator.unobtrusive.adapters.add('requiredif', ['dependentproperty', 'desiredvalue'], function (options)
{
options.rules['requiredif'] = options.params;
options.messages['requiredif'] = options.message;
});
$(document).ready(function ()
{
$.validator.addMethod('requiredif', function (value, element, parameters) {
var desiredvalue = parameters.desiredvalue;
desiredvalue = (desiredvalue == null ? '' : desiredvalue).toString();
var controlType = $("input[id$='" + parameters.dependentproperty + "']").attr("type");
var actualvalue = {}
if (controlType == "checkbox" || controlType == "radio") {
var control = $("input[id$='" + parameters.dependentproperty + "']:checked");
actualvalue = control.val();
} else {
actualvalue = $("#" + parameters.dependentproperty).val();
}
if ($.trim(desiredvalue).toLowerCase() === $.trim(actualvalue).toLocaleLowerCase()) {
var isValid = $.validator.methods.required.call(this, value, element, parameters);
return isValid;
}
return true;
});
});
_Layout.cshtml或视图
@Scripts.Render("~/bundles/jqueryval")
<script src="~/Content/JS/requiredIfValidator.js"></script>
RequiredIfAttribute.cs Class
在项目的某个位置创建它，例如在〜/ models / customValidation /
中 using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Web.Mvc;
namespace Your_Project_Name.Models.CustomValidation
{
public class RequiredIfAttribute : ValidationAttribute, IClientValidatable
{
private String PropertyName { get; set; }
private Object DesiredValue { get; set; }
private readonly RequiredAttribute _innerAttribute;
public RequiredIfAttribute(String propertyName, Object desiredvalue)
{
PropertyName = propertyName;
DesiredValue = desiredvalue;
_innerAttribute = new RequiredAttribute();
}
protected override ValidationResult IsValid(object value, ValidationContext context)
{
var dependentValue = context.ObjectInstance.GetType().GetProperty(PropertyName).GetValue(context.ObjectInstance, null);
if (dependentValue != null && dependentValue.ToString() == DesiredValue.ToString())
{
if (!_innerAttribute.IsValid(value))
{
return new ValidationResult(FormatErrorMessage(context.DisplayName), new[] { context.MemberName });
}
}
return ValidationResult.Success;
}
public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
{
var rule = new ModelClientValidationRule
{
ErrorMessage = ErrorMessageString,
ValidationType = "requiredif",
};
rule.ValidationParameters["dependentproperty"] = PropertyName;
rule.ValidationParameters["desiredvalue"] = DesiredValue is bool ? DesiredValue.ToString().ToLower() : DesiredValue;
yield return rule;
}
}
}
模型
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
using Your_Project_Name.Models.CustomValidation;
namespace Your_Project_Name.Models.ViewModels
{
public class CreateOpenActivity
{
public Nullable<int> ORG_BY_CD { get; set; }
[RequiredIf("ORG_BY_CD", "5", ErrorMessage = "Coordinator ID is required")] // This means: IF 'ORG_BY_CD' is equal 5 (for the example) > make 'COR_CI_ID_NUM' required and apply its all validation / data annotations
[RegularExpression("[0-9]+", ErrorMessage = "Enter Numbers Only")]
[MaxLength(9, ErrorMessage = "Enter a valid ID Number")]
[MinLength(9, ErrorMessage = "Enter a valid ID Number")]
public string COR_CI_ID_NUM { get; set; }
}
}
视图
实际上没有什么值得注意的......
@model Your_Project_Name.Models.ViewModels.CreateOpenActivity
@{
ViewBag.Title = "Testing";
}
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>CreateOpenActivity</h4>
<hr />
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
<div class="form-group">
@Html.LabelFor(model => model.ORG_BY_CD, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.ORG_BY_CD, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.ORG_BY_CD, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.COR_CI_ID_NUM, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.COR_CI_ID_NUM, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.COR_CI_ID_NUM, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</div>
</div>
}
我可以稍后上传项目示例......
希望这很有用
谢谢
答案 3 :(得分：2)
扩展了Adel Mourad和Dan Hunex的笔记，我修改了代码，提供了一个只接受不匹配给定值的值的示例。
我还发现我不需要JavaScript。
我将以下类添加到我的Models文件夹中：
public class RequiredIfNotAttribute : ValidationAttribute, IClientValidatable
{
private String PropertyName { get; set; }
private Object InvalidValue { get; set; }
private readonly RequiredAttribute _innerAttribute;
public RequiredIfNotAttribute(String propertyName, Object invalidValue)
{
PropertyName = propertyName;
InvalidValue = invalidValue;
_innerAttribute = new RequiredAttribute();
}
protected override ValidationResult IsValid(object value, ValidationContext context)
{
var dependentValue = context.ObjectInstance.GetType().GetProperty(PropertyName).GetValue(context.ObjectInstance, null);
if (dependentValue.ToString() != InvalidValue.ToString())
{
if (!_innerAttribute.IsValid(value))
{
return new ValidationResult(FormatErrorMessage(context.DisplayName), new[] { context.MemberName });
}
}
return ValidationResult.Success;
}
public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
{
var rule = new ModelClientValidationRule
{
ErrorMessage = ErrorMessageString,
ValidationType = "requiredifnot",
};
rule.ValidationParameters["dependentproperty"] = (context as ViewContext).ViewData.TemplateInfo.GetFullHtmlFieldId(PropertyName);
rule.ValidationParameters["invalidvalue"] = InvalidValue is bool ? InvalidValue.ToString().ToLower() : InvalidValue;
yield return rule;
}
我不需要对我的视图进行任何更改，但确实对我的模型的属性进行了更改：
[RequiredIfNot("Id", 0, ErrorMessage = "Please select a Source")]
public string TemplateGTSource { get; set; }
public string TemplateGTMedium
{
get
{
return "Email";
}
}
[RequiredIfNot("Id", 0, ErrorMessage = "Please enter a Campaign")]
public string TemplateGTCampaign { get; set; }
[RequiredIfNot("Id", 0, ErrorMessage = "Please enter a Term")]
public string TemplateGTTerm { get; set; }
希望这有帮助！
答案 4 :(得分：0)
如果您尝试使用＆＃34; ModelState.Remove＆＃34;或＆＃34; ModelState [＆＃34; Prop＆＃34;]。Errors.Clear（）＆＃34; ＆＃34; ModelState.IsValid＆＃34; stil返回false。
为什么不删除默认＆＃34;必需＆＃34;来自Model的注释，并在＆＃34; ModelState.IsValid＆＃34;之前进行自定义验证。在Controller＆＃39; Post＆＃39;行动？像这样：
if (!String.IsNullOrEmpty(yourClass.Property1) && String.IsNullOrEmpty(yourClass.dependantProperty))
ModelState.AddModelError("dependantProperty", "It´s necessary to select some 'dependant'.");
答案 5 :(得分：0)
这里与其他解决方案的主要区别在于，这个解决方案在服务器端RequiredAttribute重用逻辑，并在客户端使用required的验证方法depends属性：< / p>
public class RequiredIf : RequiredAttribute, IClientValidatable
{
public string OtherProperty { get; private set; }
public object OtherPropertyValue { get; private set; }
public RequiredIf(string otherProperty, object otherPropertyValue)
{
OtherProperty = otherProperty;
OtherPropertyValue = otherPropertyValue;
}
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
PropertyInfo otherPropertyInfo = validationContext.ObjectType.GetProperty(OtherProperty);
if (otherPropertyInfo == null)
{
return new ValidationResult($"Unknown property {OtherProperty}");
}
object otherValue = otherPropertyInfo.GetValue(validationContext.ObjectInstance, null);
if (Equals(OtherPropertyValue, otherValue)) // if other property has the configured value
return base.IsValid(value, validationContext);
return null;
}
public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
{
var rule = new ModelClientValidationRule();
rule.ErrorMessage = FormatErrorMessage(metadata.GetDisplayName());
rule.ValidationType = "requiredif"; // data-val-requiredif
rule.ValidationParameters.Add("other", OtherProperty); // data-val-requiredif-other
rule.ValidationParameters.Add("otherval", OtherPropertyValue); // data-val-requiredif-otherval
yield return rule;
}
}
$.validator.unobtrusive.adapters.add("requiredif", ["other", "otherval"], function (options) {
var value = {
depends: function () {
var element = $(options.form).find(":input[name='" + options.params.other + "']")[0];
return element && $(element).val() == options.params.otherval;
}
}
options.rules["required"] = value;
options.messages["required"] = options.message;
});