LINQ - 動態排序依據條款不起作用

Question

我有這樣的代碼：

//build query 
var shops = (from p in dataContext.shops 
let distance = dataContext.GetDistance(p.lat, p.lon, nearlat,nearlon) 
        join c in dataContext.shops_category on p.id equals c.poi_id 
        select new ShopsModel { p = p, distance = distance } 
         ); 
     } 
//add dynamic orderby 
if(somthig) 
    shops.OrderBy(distance) 
else 
    shops.OrderBy(p.name) 


//get records. 
return shop.Take(30).ToList() 

它工作得很好，除了排序依據。生成的SQL代碼不包含orderby子句，並且記錄沒有排序。

任何想法？感謝幫助。

Answer 1

排序依據沒有發生變異的基礎數據 - 它返回一個枚舉用適當的排序。您需要將結果返回商店：

if (someCondition) 
{ 
    shops = shops.OrderBy(shop => shop.distance); 
} 
else 
{ 
    shops = shops.OrderBy(shop => shop.p.name); 
} 

Answer 2

試試這個：

Shops=shops.OrderBy(distance);