例子：Read content from file to Arraylist

--------------Program.cs

 using System;

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.IO;
using System.Collections;
using System.Configuration;

namespace Test
{
    class Program
    {
        static void Main(string[] args)
        {
            ReadFile rf = new ReadFile();
            string[,] str = null;
            str=rf.ReadFileToArray();



            Console.ReadKey();
        }

    }
}

--------------ReadFile.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.IO;
using System.Collections;
using System.Configuration;

namespace Test
{
    class ReadFile
    {
        public ArrayList getFileContent()
        {
            ArrayList AL = new ArrayList();
            string strFilePath = System.Environment.CurrentDirectory + @"\" + ConfigurationSettings.AppSettings["FileName"];

            if (!File.Exists(strFilePath))
            {
                Console.WriteLine("File is not there");
            }
            try
            {
                StreamReader sr = new StreamReader(strFilePath, Encoding.GetEncoding("gb2312"));
                string l;
                while ((l = sr.ReadLine()) != null)
                {
                    AL.Add(l);

                }
                sr.Close();

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
            return AL;

        }
        public string[,] ReadFileToArray()
        {

            string[,] iret = null;

            ArrayList alNumLine = getFileContent();
            string[] strLineArr = null;
            if (alNumLine.Count > 0)
            {
                strLineArr = Convert.ToString(alNumLine[0]).Trim(',').Split(',');
                iret = new string[alNumLine.Count, strLineArr.Length];
                for (int i = 0; i < alNumLine.Count; i++)
                {
                    strLineArr = Convert.ToString(alNumLine[i]).Trim(',').Split(',');
                    for (int j = 0; j < strLineArr.Length; j++)
                    {
                        iret[i, j] = Convert.ToString(strLineArr[j]);
                    }
                }
            }

            return iret;

        }
    }

} 

--------------App.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <clear/>
    <add key="FileName" value="a.txt"/>
  </appSettings>
</configuration>