//数组拼接
            var intArray_1 = new int[] { 1, 2, 3 };
            var intArray_2 = new int[] { 4, 5, 6 };
            var result = intArray_1.Concat(intArray_2);
            foreach (var item in result)
            {
                Console.WriteLine(item);
            }

            //datatable拼接
            //创建表头
            DataTable dt1 = new DataTable();
            dt1.Columns.Add(new DataColumn("姓名",typeof(string)));
            dt1.Columns.Add(new DataColumn("年龄", typeof(string)));
            dt1.Columns.Add(new DataColumn("班级", typeof(string)));
            //添加一行数据
            DataRow dr = dt1.NewRow();
            dr["姓名"] = "小明";
            dr["年龄"] = "18";
            dr["班级"] = "三班";
            dt1.Rows.Add(dr);

            //克隆一个dt
            var newDataTable = dt1.Clone();
            //添加一行数据
            newDataTable.Rows.Add(dr);

            //合并两个datatable--用Merge()这个方法即可
            dt1.Merge(newDataTable);