c#操作Ini文件类

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)