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我需要检查内容区域是否为空,但我收到错误“对象引用未设置为实例”,这是我的页面控制器,我也试过currentPage.TabContentArea.IsEmpty
,仍然是同样的错误。内容区域是空的,这是第一次我试图运行它,所以我需要检查是否执行之前,如果语句中的代码是空的。Episerver检查内容区域是否为空
public class StandardPageController : PageController<StandardPage>
{
// GET: StandardPage
public ActionResult Index(StandardPage currentPage)
{
// this collection should be used in foreach loops
var tabItems = new List<TabViewModel>();
//this is where I get error
if(currentPage.TabContentArea.FilteredItems.Any())
{
var contentAreaItems = currentPage.TabContentArea.FilteredItems.ToList();
var contentLoader = ServiceLocator.Current.GetInstance<IContentLoader>();
foreach (var contentAreaItem in contentAreaItems)
{
// get an instance of Tab Block
// If you didn't set any restrictions, ContentArea can contain anything.
// We need to check if blockData is of type PageTab
var blockData = contentLoader.Get<PageTab>(contentAreaItem.ContentLink);
if (blockData == null) continue;
tabItems.Add(new TabViewModel
{
Id = Guid.NewGuid(),
Title = blockData.TabTitle,
Text = blockData.TabContent
});
}
ViewBag.items = tabItems;
}
return View(); // Should I return tabitems here ?
}
}
这是正确的解决方案,谢谢! :) – perkes456