在我的cshtml中,我有以下几行:
@Html.TextBoxFor(m => m.EmailAddress, new { @class = "field size4",
placeholder = LogOnUIMessages.EmailFieldLabel, id = "LoginEmailAddress",
name="LoginEmail", autofocus = "", required=""})
因为字段'required'已经被定义为数据注释(为了简单和干净的JS验证而添加了属性),我想编写一个TextBoxFor的新实现,其中包含基于数据注释的'required' :
[Required(ErrorMessageResourceType = typeof(LogOnUIMessages), ErrorMessageResourceName = LogOnResourceKeys.ErrorEmailIsRequired)]
[StringLength(UserNameMaxLength, ErrorMessageResourceType = typeof(LogOnUIMessages), ErrorMessageResourceName = LogOnResourceKeys.ErrorUserNameMaxLenghtExceeded)]
[RegularExpression(RegEx.CorrectEmailRegExp, ErrorMessageResourceType = typeof(ProfileUIMessages), ErrorMessageResourceName = LogOnResourceKeys.ErrorEmailIsNotValid)]
[DataType(DataType.EmailAddress)]
public String EmailAddress { get; set; }
(给出了更多的注释,现在只显示最重要的注释)作为概念证明,我写了一个扩展方法和一个辅助方法:
public static MvcHtmlString CustomTextBoxFor<TModel, TProperty>(
this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expression,
object htmlAttributes
)
{
return htmlHelper.TextBoxFor(expression, htmlAttributes);
}
和
public static MvcHtmlString CustomTextBoxForToo<TModel, TProperty>(
HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expression,
object htmlAttributes
)
{
return htmlHelper.TextBoxFor(expression,
HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
}
但是当被称为:
@Html.CustomTextBoxFor(
m => m.EmailAddress, new { @class = "field size4", placeholder =
LogOnUIMessages.EmailFieldLabel, id = "LoginEmailAddress",
name="LoginEmail", autofocus = "", required=""})
和
@PocExtensions.CustomTextBoxForToo(
this.Html, m => m.EmailAddress, new { @class = "field size4",
placeholder = LogOnUIMessages.EmailFieldLabel,
id = "LoginEmailAddress", name="LoginEmail",
autofocus = "", required=""})
他们都回来了:
<input autofocus="" class="field size4" id="LoginEmailAddress"
name="EmailAddress" placeholder="vul je e-mail adres in"
required="" type="text" value="">
而不是我的预期:
<input autofocus="" class="field size4" data-val="true"
data-val-length="Het opgegeven emailadres is te lang."
data-val-length-max="128" data-val-regex="Het opgegeven adres is niet geldig"
data-val-regex-pattern="[A-Za-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[A-Za-z0-
9!#$%&'*+/=?^_`{|}~-]+)*@(?:[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])
?\.)+[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?"
data-val-required="Dit veld is verplicht." id="LoginEmailAddress"
name="EmailAddress" placeholder="vul je e-mail adres in"
required="" type="text" value="">
我做错了什么?
编辑#1,其他信息
IEnumerable<ModelValidator> modelValidators=metadata.GetValidators(htmlHelper.ViewContext);
返回4个验证器。虽然:
htmlHelper.GetUnobtrusiveValidationAttributes(elementName, metadata);
返回一个空集合?
编辑#2 我找到了问题的原因,但还不是一个干净的解决方案。问题是在GetTextBoxFor函数中调用的GetUnobtrusiveValidationAttributes函数。 这不会到达我的对象上的数据注释,因为调用函数时使用的名称应该有[CLASS]。[PROPERTY]结构,而ExpressionHelper.GetExpressionText函数(在GetTextBoxFor中使用)只产生[PROPERTY]名称
现在我想知道,这是一个错误还是这个设计?
我设法组建了一个POC:
public static MvcHtmlString CustomTextBoxFor<TModel, TProperty>(
this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expression,
object htmlAttributes
)
{
var elementName = ExpressionHelper.GetExpressionText(expression);
var metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
var dataAnnotationAttributeDictionary = htmlHelper.GetUnobtrusiveValidationAttributes
(
String.Format("{0}.{1}", metadata.ContainerType.FullName, elementName),
metadata
);
var providedAttributeDictionary = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
return htmlHelper.TextBoxFor(expression, providedAttributeDictionary.Concat(dataAnnotationAttributeDictionary).ToDictionary(pair => pair.Key, pair => pair.Value));
}
现在我的问题是:(如何)可以做得更好?
答案 0 :(得分:0)
在我的帮助程序类中,当我添加数据然后传递给基础MVC 3帮助程序时,我使用以下内容:
return InputExtensions.TextBoxFor(htmlHelper, expression, htmlAttributes);
我没有检查此问题的MVC 3源代码,但我希望通过htmlHelper
进行调用是导致问题的原因。