小编far*_*g67的帖子

这是我的ViewComponent:

public class Categories: ViewComponent
{
    private readonly ICategoryService _categories;

    public Categories(ICategoryService categories)
    {
        _categories = categories;
    }      


    public IViewComponentResult Invoke()
    {
        var cat = _categories.GetCategories();
        return View(viewName: "Default", model: cat);
    }        
}

以下是我在视图中使用它的方法:

@await Component.InvokeAsync("Categories")

我尝试使用缓存:

[ResponseCache(Duration = 99999999)]

上面调用方法但没有工作.

是否可以使用视图组件缓存？如何？

我定义了List这样的:

List<Agahii.Ads> ads = new List<Agahii.Ads>();

然后我想用LINQ查询的结果填充它:

for (int i = 0; i < adid.Count(); i ++ )
{
      var dd = adid[i];
      var cc = (from a in context.Ads where a.AdID == dd select a).ToList();

      ads.Add(cc);     // error appears here
};

错误出现在该ads.Add(cc);行中.

错误:System.Collections.Generic.List.Add(Agahii.Ads)的最佳重载方法匹配有一些无效的参数

尝试将数据库(Linq到sql)中的整数数据放入标签中,以获取此错误异常:

赋值的左侧必须是变量属性或索引器

码:

protected void Page_Load(object sender, EventArgs e)
{
   DataClassesDataContext data = new DataClassesDataContext();

   var visit = (from v in data.SeeSites where v.Date == todaydate select v).FirstOrDefault();
   int seennow = visit.See; // On This line I can put data in seenow variable, no problem

   Convert.ToInt64(lblSeeNow.Text) = visit.See;   // exception error appears here
}