需要幫助一個更漂亮的LINQ to SQL查詢

Question

以下爲AdventureWorks數據庫一個T_SQL查詢：

SELECT Name
FROM Production.Product
WHERE ListPrice >= ANY
(SELECT MAX (ListPrice)
FROM Production.Product
GROUP BY ProductSubcategoryID)

我嘗試寫這個LINQ查詢：

 var groupMaxPricesquery2 = from product in dc.Products 
            group product by product.ProductSubcategoryID into productGroup 
            select productGroup.Max(eachProductInGroup => eachProductInGroup.ListPrice); 

     var query = from product in dc.Products 
        where groupMaxPricesquery2.Any(listPrice => listPrice <= product.ListPrice) 
        select product.Name; 

我怎麼能使它更美麗（即將這些查詢結合在一起，還是更有效的方法）？

非常感謝您

Answer 1

給這兩種一試：

var query = from product in dc.Products 
      let groupMaxPricesQuery = dc.Products.GroupBy(p => p.ProductSubcategoryID) 
               .Select(g => g.Max(item => item.ListPrice)) 
      where groupMaxPricesQuery.Any(listPrice => listPrice <= product.ListPrice) 
      select product.Name; 

// or 
var query = dc.Products 
       .Select(product => new { 
        Product = product, 
        GroupedMaxPrices = dc.Products.GroupBy(p => p.ProductSubcategoryID) 
               .Select(g => g.Max(item => item.ListPrice)) 
      }) 
      .Where(item => item.GroupedMaxPrices.Any(listPrice => listPrice <= item.Product.ListPrice)) 
      .Select(item => item.Product.Name); 

Answer 2

也許我失去了與分組的東西，但我不明白爲什麼它是必要的。

var maxListPrice = dc.Products.Max(p => p.ListPrice); 
var query = dc.Products.Where(p => p.ListPrice >= maxListPrice).Select(n => n.Name);