使用.NET类库操作CSV文件

CSV文件，是指使用逗号对数据进行分割的文本数据文件。昨天有人提出了一个问题，就是怎么对CSV文件进行操作，并且给出了一个类的定义。我根据这个类定义实现了一个能够读些CSV文件的类。

      由于涉及到了字符串操作，为了提高查询、替换性能，我使用了正则表达式。CSV文件打开后，会被读到本地的一个缓冲区中进行操作，然后通过调用Submit()函数项文件中更新。

代码：
using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;

namespace CSVFileClass
{
    /// <summary>
    /// Summary description for CCSVFile.
    /// </summary>
    public class CCSVFile : IDisposable
    {
        #region   Fields
        private System.IO.FileStream fileStream;
        
        private System.IO.StreamReader streamReader;
        private System.IO.StreamWriter streamWriter;
        
        private string FileName;
        private System.Collections.ArrayList strList = new System.Collections.ArrayList();
        private System.Text.RegularExpressions.Regex MatchField = new Regex(".*?,");
        private System.Text.RegularExpressions.Regex comma = new Regex(",");
        #endregion
        #region Functions
        public CCSVFile(string strFileName)
        {
            //
            // TODO: Add constructor logic here
            //
            this.FileName = strFileName;
            OpenFile();
        }
        //写一行数据，iLineIndex表示写哪一行，strLineContent表示写这一行的内容。
        public void WriteLine(int iLineIndex, string strLineContent)
        {
            if(iLineIndex<=0||iLineIndex>GetLines()+1)
                throw new ArgumentOutOfRangeException("iLineIndex","iLineIndex is out of range");
            this.strList[iLineIndex-1] = strLineContent;

        }
        //读一行数据，iLineIndex表示读哪一行的数据。
        public string ReadLine(int iLineIndex)
        {
               if(iLineIndex<=0||iLineIndex>GetLines())
            {
              throw  new ArgumentOutOfRangeException("iLineIndex","iLineIndex is out of range");
            }    
              string str;
            str = (string)this.strList[iLineIndex-1];
            return str;
        }
        //写一个字段的数据，iLineIndex表示哪一行，iFieldIndex表示哪个字段，strFieldContent表示字段内容，检查strFieldContent是否有逗号，如果内容中有就返回-1。
        public bool WriteField(int iLineIndex, int iFieldIndex, string strFieldContent)
        {  
            if (MatchField.IsMatch(strFieldContent))
                return false;


            if(iLineIndex<=0||iLineIndex>GetLines())
            {
                throw  new ArgumentOutOfRangeException("iLineIndex","iLineIndex is out of range");
            }    
            string str;
            str = (string)this.strList[iLineIndex-1];
            MatchCollection matchList = MatchField.Matches(str);
            
            if(iFieldIndex<=0||iFieldIndex>matchList.Count)
                 return false;
            
                 strFieldContent +=",";
            int i = matchList[iLineIndex-1].Index;  
            this.strList[iLineIndex-1] = MatchField.Replace(str,strFieldContent,1,matchList[iFieldIndex-1].Index);
            
                return true;
        }
        //读字段的值。
        public string ReadField(int iLineIndex, int iFieldIndex)
        {
              string result = null;
            

            if(iLineIndex<=0||iLineIndex>GetLines())
            {
                throw  new ArgumentOutOfRangeException("iLineIndex","iLineIndex is out of range");
            }    
            string str;
            str = (string)this.strList[iLineIndex-1];
            MatchCollection matchList = MatchField.Matches(str);
            
            if(iFieldIndex<=0||iFieldIndex>matchList.Count)
                return comma.Replace(result,"");
               result = matchList[iFieldIndex-1].Value.ToString();
                 return comma.Replace(result,"");
              }
        //得到需要读写的哪一行
        private int GetLines()
        {
            return this.strList.Count;
        }
        
        //向文件提交数据
        public void Submit()
        {
               this.streamReader.Close();
            this.streamWriter = new StreamWriter(this.FileName);
            foreach (string str in this.strList)
            {
                this.streamWriter.WriteLine(str);        
            
            }
            this.streamWriter.Close();
             OpenFile();
        
        }

        //打开指定文件
        private void OpenFile()
        {
        
            try
            {
                fileStream = new FileStream(this.FileName,System.IO.FileMode.Open,System.IO.FileAccess.ReadWrite);    
            }
            catch(System.IO.FileNotFoundException e)
            {
                this.fileStream = null;
                throw new System.IO.FileNotFoundException(e.Message,e.FileName,e.InnerException);
                
            }
            string tmpString;
            streamReader = new StreamReader(this.fileStream);
            do
            {
                tmpString = this.streamReader.ReadLine();
                if(null != tmpString)
                    strList.Add(tmpString);
            }
            while(null != tmpString);

        
        }
        
        public void Close()
        {
           this.Dispose();
        
        }
        #endregion
        #region IDisposable 成员

        public void Dispose()
        {
            // TODO:  添加 CCSVFile.Dispose 实现
          this.fileStream.Close();
            this.streamReader.Close();
               this.streamWriter.Close();
        }

        #endregion
    }
}