[Section]
Key1=Value1
Key2=Value2

class IniFile 
  { 
    /* 
    * 声明API函数 
    */ 
    public string iniPath; 
    [DllImport("kernel32")] 
    private static extern long WritePrivateProfileString(string section, string key, string val, string filePath); 
    [DllImport("kernel32")] 
    private static extern int GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int size, string filePath); 
 
    /// <summary> 
    /// 构造函数 
    /// </summary> 
    /// <param name="iniPath">ini文件路径，默认为当前路径下default.ini</param> 
    public IniFile(string iniPath = "./default.ini") 
    { 
      this.iniPath = iniPath; 
    } 
 
    /// <summary> 
    /// 写入ini文件 
    /// </summary> 
    /// <param name="Section">Section</param> 
    /// <param name="Key">键</param> 
    /// <param name="Value">值</param> 
    public void writeIni(string Section, string Key, string Value) 
    { 
      WritePrivateProfileString(Section, Key, Value, this.iniPath); 
    } 
 
    /// <summary> 
    /// 写入ini文件，不管section，默认放在default里 
    /// </summary> 
    /// <param name="Key">键</param> 
    /// <param name="Value">值</param> 
    public void writeIni(string Key, string Value) 
    { 
      WritePrivateProfileString("default", Key, Value, this.iniPath); 
    } 
 
    /// <summary> 
    /// 读取ini文件 
    /// </summary> 
    /// <param name="Section">Section</param> 
    /// <param name="Key">键</param> 
    /// <returns>返回的值</returns> 
    public string readIni(string Section, string Key) 
    { 
      StringBuilder temp = new StringBuilder(256); 
      int i = GetPrivateProfileString(Section, Key, "", temp, 256, this.iniPath); 
      return temp.ToString(); 
    } 
 
    /// <summary> 
    /// 读取section，不管section，默认从default里读取 
    /// </summary> 
    /// <param name="Key">键</param> 
    /// <returns>返回值</returns> 
    public string readIni(string Key) 
    { 
      return readIni("default", Key); 
    } 
 
    /// <summary> 
    /// 查询ini文件是否存在 
    /// </summary> 
    /// <returns>是否存在</returns> 
    public bool existINIFile() 
    { 
      return File.Exists(iniPath); 
    } 
  } 

class Program 
{ 
  static void Main(string[] args) 
  { 
    IniFile iniFile = new IniFile("./hello.ini"); 
    iniFile.writeIni("section1", "key1", "value11"); 
    iniFile.writeIni("section1", "key2", "value12"); 
    iniFile.writeIni("section2", "key1", "value21"); 
    iniFile.writeIni("section2", "key2", "value22"); 
 
    iniFile.writeIni("key", "value"); 
 
    string str = iniFile.readIni("key"); 
    Console.WriteLine(str); 
    Console.ReadKey(); 
  } 
}