c# ini文件操作

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代码：
class Config    {        /// <summary>        /// 存储的ini文件名，在APP同一级目录下        /// </summary>        private static string IniFileName = ".\\Config.ini";        /// <summary>        /// DLL写ini        /// </summary>        /// <param name="section">要写入的段落名</param>        /// <param name="key">要写入的键，如果该key存在则覆盖写入</param>        /// <param name="val">key所对应的值</param>        /// <param name="filePath">INI文件的完整路径和文件名</param>        /// <returns></returns>        [DllImport("kernel32")]        private static extern long WritePrivateProfileString(string section, string key, string val, string filePath);        /// <summary>        /// DLL读取ini        /// </summary>        /// <param name="section">要读取的段落名</param>        /// <param name="key">要读取的键</param>        /// <param name="defVal">读取异常的情况下的缺省值</param>        /// <param name="retVal">key所对应的值，如果该key不存在则返回空值</param>        /// <param name="size">值允许的大小</param>        /// <param name="filePath">INI文件的完整路径和文件名</param>        /// <returns></returns>        [DllImport("kernel32")]        private static extern int GetPrivateProfileString(string section, string key, string defVal, System.Text.StringBuilder retVal, int size, string filePath);        /// <summary>        /// 写入INI文件        /// </summary>        /// <param name="Section">项目名称(如 [TypeName] )</param>        /// <param name="Key">键</param>        /// <param name="Value">值</param>        public static long WriteValue(string Section, string Key, string Value)        {            return WritePrivateProfileString(Section, Key, Value, IniFileName);        }        /// <summary>        /// 读出INI文件        /// </summary>        /// <param name="Section">项目名称(如 [TypeName] )</param>        /// <param name="Key">键</param>        public static string ReadValue(string Section, string Key, string Default)        {            StringBuilder temp = new StringBuilder(500);            int i = GetPrivateProfileString(Section, Key, Default, temp, 500, IniFileName);            if (Default.Equals(temp.ToString()))            {                //证明配置文件中没有该项，这时候将默认值写入                WriteValue(Section, Key, Default);             }            return temp.ToString();        }    }
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