Question

我有以下课程：

public partial class MemberTank
{
    public int Id { get; set; }
    public string TankName { get; set; }
    public int Battles { get; set; }
    public int Victories { get; set; }
}

我正在尝试构建一个LINQ，它获取TankName的列表，其中包含每个坦克的胜利百分比。我知道我需要划分战斗和胜利的总和，但我不知道该怎么做。

做一个或另一个的总和很容易......

 var sumVictories = (from p in db.MemberTanks
                     group p by p.TankName into g
                     select new { 
                         Tank = g.Key, 
                         Victories = g.Sum(p => p.Victories) 
                     }).OrderByDescending(a => a.Victories);

...但我不确定如何将两个字段相加然后除以得到我需要的百分比。

Answer 1

这应该有用......

        var sumVictories = (from p in memberTanks
                            group p by p.TankName
                            into g
                            select new
                                    {

                                        Tank = g.Key,
                                        Victories = g.Sum(p => p.Victories),
                                        Avg = ((double)g.Sum(p => p.Victories) / (double)g.Sum(p => p.Battles)) * 100
                                    }).OrderByDescending(a => a.Victories);

[edit]稍微清理一下代码

如何在LINQ查询中获得由2个求和字段得到的除数值？

1 个答案: