DataTable行列转换

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data.SqlClient;

using System.Data;

namespace columnChange

{

    class Program

    {

        static void Main(string[] args)

        {

            SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;Initial Catalog=Test;User ID=××××;Password=××××");

            using (conn)

            {

                conn.Open();

                SqlDataAdapter apt = new SqlDataAdapter("select top 10 * from news ", conn);

                DataTable tb = new DataTable();

                apt.Fill(tb);

                DataTable tt = Col2Row(tb, "articleId");



            }

        }

        /// <summary>

        /// 将DataTable行列转换

        /// </summary>

        /// <param name="src">要转换的DataTable</param>

        /// <param name="columnHead">要作为Column的哪列</param>

        /// <returns></returns>

        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();

        }

    }

}

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