Question

我有PartialView广泛使用ViewContext.Controller.ValueProvider.GetValue("action").RawValue，这是一个片段：

 <div class="@(ViewContext.Controller.ValueProvider.GetValue("action").RawValue.ToString() == "AddQuestion" ? "selectedItem" : "unselectedItem")">
              @Html.ActionLink("Add a Question", "AddQuestion", new { topicId = ViewBag.topicId })</div>
 <div class="@(ViewContext.Controller.ValueProvider.GetValue("action").RawValue.ToString() == "AddSubTopic" ? "selectedItem" : "unselectedItem")">
                @Html.ActionLink("Add (Sub) Topic", "AddSubTopic", new { topicId = ViewBag.topicId })</div>
 <div class="@(ViewContext.Controller.ValueProvider.GetValue("action").RawValue.ToString() == "AddResource" ? "selectedItem" : "unselectedItem")">
                @Html.ActionLink("Add a Resource", "AddResource", new { topicId = ViewBag.topicId }) </div>

它继续这样......
我可以将动作名称保存在.cshtml中吗？（将它保存在ViewBag中对我来说似乎并不自然，因为.cshtml本身提供了这些信息）

Answer 1

@{ var actionName = ViewContext.Controller.ValueProvider.GetValue("action").RawValue.ToString(); }

<div class="@(actionName == "AddQuestion" ? "selectedItem" : "unselectedItem")">
@Html.ActionLink("Add a Question", "AddQuestion", new { topicId = ViewBag.topicId })</div>
<div class="@(actionName == "AddSubTopic" ? "selectedItem" : "unselectedItem")">
...

但创建一个HtmlHelper

可能会更清晰

public static HtmlString CssClassForAction(this HtmlHelper helper, string action) {
  var actionName = helper.ViewContext.Controller.ValueProvider.GetValue("action").RawValue.ToString();
  return new HtmlString(actionName == action ? "selectedItem" : "unselectedItem");
}

并在您的视图中

<div class="@Html.CssClassForAction("AddQuestion")">
@Html.ActionLink("Add a Question", "AddQuestion", new { topicId = ViewBag.topicId })</div>
<div class="@Html.CssClassForAction("AddSubTopic")">
...

重构此PartialView（在.cshtml中保存当前操作名称）

1 个答案: