高效的数据表分组依据

您可以使用Linq。

var result = from row in dt.AsEnumerable()   group row by row.Field<int>("TeamID") into grp    select new      {      TeamID = grp.Key,       MemberCount = grp.Count()       }; foreach (var t in result)     Console.WriteLine(t.TeamID + " " + t.MemberCount);