我怎样才能设置HiddenFieldFor默认值在Asp.Net MVC [英] How can i set Default value for HiddenFieldFor In Asp.Net MVC

问题描述

我使用HiddenFor与模型的结合具有约束力的价值吧。
我希望我能做到这一点重置绑定值zero.How？

我试过，但它不工作...

 ＆LT;％的foreach（在型号VAR项）{％GT;
 ＆LT;％：Html.HiddenFor（型号=＆GT; model.ID，新{@值=0}）％GT;
 ＆LT;％}％GT;
 

解决方案

您可以创建自己的帮助扩展是：

 公共静态MvcHtmlString HiddenFor＆LT;的TModel，TProperty＆GT;（此的HtmlHelper＆LT;的TModel＆GT;的帮手，防爆pression＆LT; Func键＆LT;的TModel，TProperty＆GT;＆GT;前pression，对象值，对象htmlAttributes）
{
    VAR propertyName的防爆= pressionHelper.GetEx pressionText（如pression）;    VAR输入=新TagBuilder（输入）;
    input.MergeAttribute（ID，helper.AttributeEn code（helper.ViewData.TemplateInfo.GetFullHtmlFieldId（propertyName的）））;
    input.MergeAttribute（名，helper.AttributeEn code（helper.ViewData.TemplateInfo.GetFullHtmlFieldName（propertyName的）））;
    input.MergeAttribute（价值，value.ToString（））;
    input.MergeAttribute（类型，隐藏）;
    input.MergeAttributes（新RouteValueDictionary（htmlAttributes））;    返回MvcHtmlString.Create（input.ToString（））;
}
 

i am using HiddenFor with model binding which is binding value to it. i want to reset the binded value to zero.How can i do it?

i tried this but it is not working...

<% foreach (var item in Model ) { %>
 <%: Html.HiddenFor(model => model.ID,new { @value="0"})%>
 <% } %>

解决方案

You can create your own helper extension for that:

public static MvcHtmlString HiddenFor<TModel, TProperty>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TProperty>> expression, object value, object htmlAttributes)
{
    var propertyName = ExpressionHelper.GetExpressionText(expression);

    var input = new TagBuilder("input");
    input.MergeAttribute("id", helper.AttributeEncode(helper.ViewData.TemplateInfo.GetFullHtmlFieldId(propertyName)));
    input.MergeAttribute("name", helper.AttributeEncode(helper.ViewData.TemplateInfo.GetFullHtmlFieldName(propertyName)));
    input.MergeAttribute("value", value.ToString());
    input.MergeAttribute("type", "hidden");
    input.MergeAttributes(new RouteValueDictionary(htmlAttributes));

    return MvcHtmlString.Create(input.ToString());
}

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