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对DataTable进行分组

因为程序的特殊情景,需要在sql查出来的DataTable进行分组,DataTable分组可以使用linq,也可以自己写分组程序。

linq相对简单:

cmd.CommandText = sql;
cmd.CommandType = CommandType.Text;
cmd.CommandTimeout = 300;
MySqlDataReader reader = cmd.ExecuteReader();

DataTable tb = new DataTable();
detailTable.Load(reader);
reader.Close();

var query = from c  in tb .AsEnumerable()
                        group c by new {
                            pingming = c.Field<string>("品名"),
                            guige = c.Field<string>("规格")
                                        }
                            into s
                            select new
                            {
                                pingming = s.Select(p => p.Field<string>("品名")).First(),
                                shuliang = s.Sum(p => Convert.ToInt32(p.Field<string>("数量"))),
                                guige = s.Select(p => p.Field<string>("规格")).First(),
                                biaohao = string.Join(";",s.Select(p => p.Field<string>("表号")))
                            };
      DataTable tbc = tb.Clone();
             query.ToList().ForEach(p =>tbc.Rows.Add(p.pingming, p.guige,p.biaohao,p.shuliang));//同下面foreach,只不过下面版本循环体可以做一些逻辑操作
      foreach(var row in query )
     {
        DataRow r = tbc.NewRow();
        r["pingming"]=row.pingming;
        r["guige "]=row.guige ;
        r["biaohao "]=row.biaohao;
        r["shuliang "]=row.shuliang ;
        tbc.Rows.Add(r);
     }
 

 

 

对DataTable进行分组