我让它在 ASP.NET MVC 5 上工作
我看到很多人对此代码感兴趣并为此感到痛苦，我第一次知道它确实令人困惑和破坏。
注意事项
- 在服务器端和客户端都使用 MVC 5 :D
- 我根本没有安装“ExpressiveAnnotations”库。
- 我正在了解“@Dan Hunex”的原始代码，请在上方找到他
解决此错误的提示
"System.Web.Mvc.RequiredAttributeAdapter 类型必须有一个公共构造函数，它接受 System.Web.Mvc.ModelMetadata、System.Web.Mvc.ControllerContext 和 ExpressiveAnnotations.Attributes.RequiredIfAttribute 类型三个参数参数名称：adapterType "
提示 #1： 确保您继承自“ValidationAttribute”而不是“RequiredAttribute”
public class RequiredIfAttribute : ValidationAttribute, IClientValidatable { ...}
提示 #2： 或者从 'Global.asax' 中删除这一整行，在较新版本的代码中根本不需要它（在由@Dan_Hunex），是的，这行在旧版本中是必须的...
DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof(RequiredIfAttribute), typeof(RequiredAttributeAdapter));
使 Javascript 代码部分工作的提示
1- 将代码放入一个新的 js 文件中（例如：requiredIfValidator.js）
2- 扭曲 $(document).ready(function(){........}); 中的代码；
3- 在包含 JQuery 验证库之后包含我们的 js 文件，所以现在看起来像这样：
@Scripts.Render("~/bundles/jqueryval")
<script src="~/Content/JS/requiredIfValidator.js"></script>
4- 编辑 C# 代码
来自
rule.ValidationParameters["dependentproperty"] = (context as ViewContext).ViewData.TemplateInfo.GetFullHtmlFieldId(PropertyName);
到
rule.ValidationParameters["dependentproperty"] = PropertyName;
从
if (dependentValue.ToString() == DesiredValue.ToString())
到
if (dependentValue != null && dependentValue.ToString() == DesiredValue.ToString())
我的整个代码启动并运行
Global.asax
这里没什么好补充的，保持干净
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 类
在项目中的某个位置创建它，例如在 ~/models/customValidation/
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; }
}
}
观点
其实这里没什么要注意的……
@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>
}
我稍后可能会为此上传一个项目示例...
希望对您有所帮助
谢谢