使用linq按对象的2属性排序对象列表

Question

class TeamInfo
{
    public int TeamId { get; set; }
    public int Points { get; set; }
    public int Average { get; set; } 
}

TeamId  : 5,22,11,52,59 
Points  : 3, 8, 8,12,16
Average : 8,-2,-4, 1, 5

I have a list of TeamInfo objects( List<TeamInfo> teamInfoList ) I want to sort this list as follows;

TeamId | Points | Average
  59   |  16    |   5
  52   |  12    |   1
  22   |   8    |  -2
  11   |   8    |  -4
  5    |   3    |  -8

I need to sort first by Points(descending) and then Average(descending) if points are the same.

I tried this;

List<int> sortTeams = teamInfoList
            .GroupBy(x => new { x.TeamId , x.Points, x.Average })
            .OrderByDescending(x=>new { x.Key.Points, x.Key.Average })
            .Select(i => i.Key.TeamId).ToList();

I guess i need to implement IComparable but i have no idea how to do it.

Answer 1

Use ThenBy:

List<int> sortTeams = teamInfoList
    .OrderByDescending(x => x.Points)
    .ThenByDescending(x => x.Average)
    .Select(i => i.TeamId)
    .ToList();