LINQ group by和C#中的order by

Question

我需要按照州和城市的顺序将我的城市列表转换为组.

我试过下面一个但是没能把它弄好.非常感谢任何帮助.

cities.GroupBy(g => g.state).Select(o => o.OrderBy(c => c.cityname));

Answer 1

试试下面的代码

cities.GroupBy(g => g.state)
.Select(o =>new { 
          State = o.Key,
         Cities = o.OrderBy(c => c.cityname).Tolist()})
.Tolist();