asp.net-mvc-2 - 如何在 Asp.Net MVC 中设置 HiddenFieldFor 的默认值

Question

我正在使用带有模型绑定的 HiddenFor，这是绑定值。我想将绑定值重置为零。我该怎么做？

我试过这个，但它不工作......

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

Answer 1

您可以为此创建自己的辅助扩展：

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());
}

Answer 2

只需ID在控制器操作中将模型的属性设置为0.