Linq 分组查询

根据部门分组 ,然后存储部门下所有员工

  public class Custom
     {
         public string dname { get; set; }
         public List<Employees> lis { get; set; }
     }
     public class Employees
     {
         public string id { get; set; }
         public string name { get; set; }
         public string depart { get; set; }
     }
 static void main()
 {
 DataTable dt = new DataTable();
                 dt.Columns.Add(new DataColumn("id"));
                 dt.Columns.Add(new DataColumn("name"));
                 dt.Columns.Add(new DataColumn("depart"));

                 string[] s = { "1,a,.net", "2,b,.net", "3,c,.net", "4,h,ui", "5,i,ui", "6,j,ui" };
                 foreach (string p in s)
                 {
                     DataRow dr = dt.NewRow();
                     dr[] = p.Split(',')[];
                     dr[] = p.Split(',')[];
                     dr[] = p.Split(',')[];
                     dt.Rows.Add(dr);
                 }

                 var item = from p in dt.AsEnumerable()
                            group p by p.Field<string>("depart") into d
                            select new Custom
                            {
                                dname = d.Key,
                                lis = dt.AsEnumerable().Where(a => a.Field<string>("depart") == d.Key)
                                       .Select(a => new Employees { id = a.Field<string>("id"), name = a.Field<string>("name"), depart = a.Field<string>("depart") }).ToList<Employees>()
                            };
 }