20180322 对DataTable里面的数据进行去重

DataTable dt = new DataTable();
            dt.Columns.Add("Id", typeof(int));
            dt.Columns.Add("Nu", typeof(int));
            Random r = new Random(DateTime.Now.Millisecond);
           
            //DataTable 去重
            for (int i = 0; i < 11; i++)
            {
                dt.Rows.Add(r.Next(1, 11),10);
            }
            dt.Rows.Add(1);
            DataView dv = new DataView(dt);
            dt = dv.ToTable(true, new string[] {"Id","Nu"});    //对Id，Nu 进行过滤，true表示使用distinct方法

            foreach (DataRow item in dt.Rows)
            {
                Console.WriteLine(item["Id"].ToString());
            }