自定义MVC Helper ForModel和Dataannotations

我已经创建了一个DatePickerFor Helper，但它没有得到ViewModel的验证器。

我的视图模型：

public class Dates
{
    public DateTime ExpiringDate { get; set; }
    [Required(ErrorMessage = "This field is required!")]
    [LessThan("ExpiringDate")]
    public DateTime Start { get; set; }
}

我的助手：

public static MvcHtmlString DatePickerFor(this HtmlHelper helper,Expression<Func<TModel, TProperty>> expression /*, Some args*/)
{
     StringBuilder html = new StringBuilder();
                html.Append("<div class='"input-group'">");
                html.Append("<span class='"input-group-addon'"><i class='"fa fa-calendar'"></i></span>");
                html.Append("<input id='"" + id + "'" type='"text'" name='"" + name + "'" value='"" + dateValue + "'" class='"form-control datepicker " + cssClass + "'" data-dateformat='"dd/mm/yy'" placeholder='"00/00/0000'" " + attrs + "/>");
                html.Append("</div>");
     return new MvcHtmlString(html.ToString());
    }

是否可以将视图模型中定义的"data val required"和其他验证添加到我的html中？

谢谢！

    public static MvcHtmlString DatePickerFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, object htmlAttributes)
    {
        var extendedAttributes = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
        extendedAttributes.Add("class", "form-control datepicker");
        extendedAttributes.Add("data-dateformat", "dd/mm/yy");
        extendedAttributes.Add("placeholder", "00/00/0000");
        return htmlHelper.TextBoxFor(expression, extendedAttributes);
    }