OrderByDescending在AddRange之前Linq查询

Question

我有两个List,promolist和packagelist。 packagelist数据必须是第一个，然后packagelist，既list必须OrderByDescending和ThenByDescending的level然后totalclick

贝娄是我试过

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

结果是我想几乎什么，promolist是以前packagelist，并packagelist有正确的订单，只是promolist没有做任何OrderByDescending或ThenByDescending

Answer 1

OrderBy的结果是您需要分配和评估的新枚举。你不会对结果做任何事情。

你需要这样的：

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