using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;


namespace OperateIni
{
public class IniFile
{
  private string IniFileName;

   [DllImport("kernel32")]
  private static extern int GetPrivateProfileInt(string lpAppName, string lpKeyName,
   int nDefault, string lpFileName);

   [DllImport("kernel32")]
  private static extern int GetPrivateProfileString(string lpAppName, string lpKeyName,
   string lpDefault, StringBuilder lpReturnedString, int nSize, string lpFileName);

   [DllImport("kernel32")]
  private static extern bool WritePrivateProfileString(string lpAppName,
   string lpKeyName, string lpString, string lpFileName);

  public IniFile(string Filename)
   {
       IniFileName = Filename;
   }
  
  public int ReadIni(string Section,string Key,int Default)
   { 
      return GetPrivateProfileInt(Section,Key,Default,IniFileName);
   }

  public string ReadIni(string Section,string Key,string Default)
   { 
       StringBuilder temp = new StringBuilder(1024); 
      int rec=GetPrivateProfileString(Section,Key,Default,temp,1024,IniFileName);
      return temp.ToString();
   }

  public void WriteIni(string Section,string Key,int intValue)
   { 
       WritePrivateProfileString(Section,Key,intValue.ToString(),IniFileName);
   }

  public void WriteIni(string Section,string Key,string strValue)
   { 
       WritePrivateProfileString(Section,Key,strValue,IniFileName);
   }
}
}

最好是加上判断文件是否存在，不存在则进行创建文件、错误处理等功能。