AddBange Linq查询之前的OrderByDescending

Question

I have two List , promolist and packagelist . packagelist data must be the first then packagelist , both list must OrderByDescending and ThenByDescending the level then totalclick

Bellow is what I tried

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

The result is nearly what I want, promolist is before packagelist , and packagelist have order correctly, just the promolist not do any OrderByDescending or ThenByDescending

Answer 1

The outcome of OrderBy is a new enumerable that you need to assign and evaluate. You don't do anything with the outcome.

You need this:

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