C# 如何获得浏览量最高的前五名产品？

我是LINQ的新手，正在尝试用MVC和LINQ建立一个网站。我想展示视图最多的前5种产品。我有如下两个表格，我正在尽可能简单地解释

PRODUCT
-------
ID
NAME

PRODUCT_VIEWS_TABLE
-------
ID
PRODUCT_ID

每次查看产品时，我都会在product\u VIEWS\u表中插入新行。如何为此编写LINQ查询

(from c in db.PRODUCT select c).Take(5)

这个怎么样：

var top5 = productViews
             .GroupBy(view => view.ProductId)   // group views by product
             .OrderByDescending(g => g.Count()) // order from most- to least-viewed
             .Take(5)                           // take the top 5
             .Select(g => g.First().Product);   // fetch the corresponding product

试试这个：

var topProducts = m_context.PRODUCTS
    .Join(m_context.PRODUCT_VIEW, product=> product.Id, view => view.ProductId,
        (product, view ) => new { ProductId = product.Id, ViewId = view.Id})
    .GroupBy(g => g.ProductId)
    .Select(s => new {
        Id = s.Key,
        ViewCount= s.Count()
    })
    .OrderByDescending(o => o.ViewCount)
    .Take(5).ToList();

---

.Select（）和.OrderByDescending（）行不编译.first。从顶部选择，然后从其下方选择..OrderByDescending。它说的是“无效匿名…”，这在问题中没有规定。我刚才提到了更多信息，+1表示更简单的LINQ

var topProducts = m_context.PRODUCTS
    .Join(m_context.PRODUCT_VIEW, product=> product.Id, view => view.ProductId,
        (product, view ) => new { ProductId = product.Id, ViewId = view.Id})
    .GroupBy(g => g.ProductId)
    .Select(s => new {
        Id = s.Key,
        ViewCount= s.Count()
    })
    .OrderByDescending(o => o.ViewCount)
    .Take(5).ToList();