datatable 行列转换

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            DataTable dt = GetDt();
            DataTable res = Col2Row(dt, "Col01");
            DataTable test = Col2Row(dt);
        }


        public static DataTable Col2Row(DataTable src, int columnHead)
        {
            DataTable result = new DataTable();
            DataColumn myHead = src.Columns[columnHead];
            result.Columns.Add(myHead.ColumnName);
            for (int i = 0; i < src.Rows.Count; i++)
            {
                result.Columns.Add(src.Rows[i][myHead].ToString());
            }
            //
            foreach (DataColumn col in src.Columns)
            {
                if (col == myHead)
                    continue;
                object[] newRow = new object[src.Rows.Count + 1];
                newRow[0] = col.ColumnName;
                for (int i = 0; i < src.Rows.Count; i++)
                {
                    newRow[i + 1] = src.Rows[i][col];
                }
                result.Rows.Add(newRow);
            }
            return result;
        }

        public static DataTable Col2Row(DataTable src, string columnHead)
        {
            for (int i = 0; i < src.Columns.Count; i++)
            {
                if (src.Columns[i].ColumnName.ToUpper() == columnHead.ToUpper())
                    return Col2Row(src, i);
            }
            return new DataTable();
        }


        private static DataTable GetDt()
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("Col01");
            dt.Columns.Add("Col02");
            dt.Columns.Add("Col03");

            DataRow dr = dt.NewRow();
            dr["Col01"] = 1;
            dr["col02"] = 2;
            dr["Col03"] = 3;
            dt.Rows.Add(dr);

            DataRow dr2 = dt.NewRow();
            dr2["Col01"] = 4;
            dr2["col02"] = 5;
            dr2["Col03"] = 6;
            dt.Rows.Add(dr2);

            DataRow dr3 = dt.NewRow();
            dr3["Col01"] = 7;
            dr3["col02"] = 8;
            dr3["Col03"] = 9;
            dt.Rows.Add(dr3);

            return dt;
        }

        private static DataTable Col2Row(DataTable dt)
        {
            DataTable result = new DataTable();
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                result.Columns.Add(i.ToString());
            }
            result.Columns.Add(dt.Rows.Count.ToString());
            foreach (DataColumn col in dt.Columns)
            {
                object[] newRow = new object[dt.Rows.Count + 1];
                newRow[0] = col.ColumnName;
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    newRow[i + 1] = dt.Rows[i][col];
                }
                result.Rows.Add(newRow);
            }            
            return result;
        }

    }
}