摘要：
var queryGBN = from q in dt.AsEnumerable() group q by new { Doc_Type = q.Field<string>("Doc_Type"), Packing_Method = q.Field<string>("Packing_Method"), Packing_Method_Desc = q.Field<string>("Packing_Method_Desc") } into g where g.Count()>1 select ne 阅读全文
