OrderByDescending在AddRange之前Linq查詢

Question

我有兩個List,promolist和packagelist。 packagelist數據必須是第一個，然後packagelist，既list必須OrderByDescending和ThenByDescending的level然後totalclick

貝婁是我試過

promolist.OrderByDescending(o => o.packagelevel.level).ThenByDescending(o => o.totalclick); 
promolist.AddRange(packagelist.OrderByDescending(o => o.packagelevel.level).ThenByDescending(o => o.totalclick)); 
return promolist; 

結果是我想幾乎什麼，promolist是以前packagelist，並packagelist有正確的訂單，只是promolist沒有做任何OrderByDescending或ThenByDescending

Answer 1

OrderBy的結果是您需要分配和評估的新枚舉。你不會對結果做任何事情。

你需要這樣的：

promolist = promolist.OrderByDescending(o => o.packagelevel.level) 
        .ThenByDescending(o => o.totalclick) 
        .ToList();