c# - 一个 LINQ 表达式中的计数和非重复计数

Question

有没有办法将 2 个 linq 表达式合并为一个？ IE。所以一个 LINQ 表达式会将 DistCount 和 NormCount 返回到 2 个单独的 int 变量中。

DistCount = (from string row in myList[i]
                where row.Length > 0
                select row).Distinct().Count();

NormCount = (from string row in myList[i]
                where row.Length > 0
                select row).Count();

Answer 1

按行做一个group。然后，您将获得非重复计数(组数)和总数(Count 的总和)

var q = (from string row in myList[i]
    where row.Length > 0
    group row by row into rowCount
    select new {rowCount.Key, rowCount.Count})

int distinct = q.Count();
int total = q.Sum(r=>r.Count);