ViewBag 检测最后一项 MVC

Question

我有 ViewBag 中的对象列表。有什么方法可以检查该项目是否是 Razor 视图中 ViewBag 中的最后一个项目？

@if (ViewBag.List != null)
{
    foreach(var item in ViewBag.List)
    {
        if(item[0] == **LAST ITEM** ) // here I want to check if it is the last item in my ViewBag.List
        { 
            /* do stuff */ 
        } 
    }
}

编辑：我将多年存储为匿名对象

public object GetYears(){
    return result.Distinct().OrderBy(i => i.startYear).Select(c => new[]
                {
                    c.startYear
                });
}

ViewBag.List = GetYears();

Answer 1

如果 ViewBag.List 实现 IEnumerable<T> 你可以使用 Last() 你需要castViewBag 中的列表才能访问IEnumerable 的方法或按索引访问，我假设startYear 是int。

@if (ViewBag.List != null)
{
    var last_item = (ViewBag.List as IEnumerable<int[]>).Last();
    foreach(var item in ViewBag.List)
    {
        if(item[0] == last_item[0]) // here I want to check if it is the last item in my ViewBag.List
        { 
            /* do stuff */ 
        } 
    }
}

或者您可以使用传统方式使用Count 并通过index 访问元素

@if (ViewBag.List != null)
{
    IEnumerable<int[]> viewbag_list = (ViewBag.List as IEnumerable<int[]>);
    var last_item = viewbag_list[viewbag_list.Count()-1];
    foreach(var item in ViewBag.List)
    {
        if(item[0] == last_item[0]) // here I want to check if it is the last item in my ViewBag.List
        { 
            /* do stuff */ 
        } 
    }
}