Question

我有两种模式：

GroupNews
消息

我想通过局部视图查看列出的群组新闻，并显示与此群组相关的新闻数量

在groupnews模型中：

public long GroupId { get; set; }
public string Name { get; set; }

public long newsId { get; set; }
public string Title { get; set; }

public long GroupId { get; set; }

：

public ActionResult Index()
{
    var db = new ApplicationDbContext()
    var CountNews = from p in db.tbl_GroupNews
                    let cCount = (from c in db.tbl_News
                                  where p.GroupId== c.GroupId
                                  select c
                                 ).Count()
                    select new { GroupId= p.GroupId, coun = cCount }

    ViewBag.CountNews= CountNews.Count()}

和我的部分视图

@foreach (var item in Model){

<div class="info-box">

    <div class="info-box-content">
        <span class="info-box-text">@item.Name::count of news in this group </span>
        <span class="info-box-number">
         @ViewBag.CountNews
        </span>


    </div><!-- /.info-box-content -->
</div><!-- /.info-box -->}

Answer 1

如果您在数据库中使用外键，那么您只需通过以下方式获取计数：

 var db = new ApplicationDbContext()
var CountNews = db.tbl_GroupNews.News.Count();
ViewBag.Counter = CountNews;

and if you are not using lazy loading then can get by
var db = new ApplicationDbContext()
var CountNews = db.tbl_GroupNews.Include(w=>w.News).News.Count();
ViewBag.Counter = CountNews;

此外，我还有另一种选择，您可以获取新闻组的所有数据：

var db = new ApplicationDbContext();
var model = db.groupnew.include(w=>w.News).tolist();

在部分视图中，您可以使用：

@foreach (var item in Model){

<div class="info-box">

    <div class="info-box-content">
        <span class="info-box-text">@item.Name::count of news in this group </span>
        <span class="info-box-number">
         @item.News.Count()
        </span>


    </div><!-- /.info-box-content -->
</div><!-- /.info-box -->}

新闻组中的新闻总数

1 个答案: