在C#中如何读写INI文件

//写INI文件
[ DllImport ( "kernel32" ) ]
private static extern bool WritePrivateProfileString ( string section ,string key , string val , string filePath ) ;
//读ini文件（字符
[ DllImport ( "kernel32" ) ]
private static extern int GetPrivateProfileString ( string section ,string key , string def , StringBuilder retVal ,int size , string filePath ) ;

//读ini文件（数字
[ DllImport ( "kernel32" ) ]
private static extern int GetPrivateProfileInt ( string section ,string key , int def , string filePath ) ;

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

namespace EchonComponentLibrary
{
/// <summary>
/// IniFile 的摘要说明。
/// </summary>
public class IniFile
{
private string FFileName;

[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)
{
FFileName = filename;
}
public int ReadInt(string section,string key,int def)
{
return GetPrivateProfileInt(section,key,def,FFileName);
}
public string ReadString(string section,string key,string def)
{
StringBuilder temp = new StringBuilder(1024);
GetPrivateProfileString(section,key,def,temp,1024,FFileName);
return temp.ToString();
}
public void WriteInt(string section,string key,int iVal)
{
WritePrivateProfileString(section,key,iVal.ToString(),FFileName);
}
public void WriteString(string section,string key,string strVal)
{
WritePrivateProfileString(section,key,strVal,FFileName);
}
public void DelKey(string section,string key)
{
WritePrivateProfileString(section,key,null,FFileName);
}
public void DelSection(string section)
{
WritePrivateProfileString(section,null,null,FFileName);
}

}
}