读写INI配置文件

    public class INIHelper
    {
        /// <summary>
        /// 写入指定配置文件、指定节、指定键的值
        /// </summary>
        /// <param name="section">节名</param>
        /// <param name="key">键名</param>
        /// <param name="retVal">返回值</param>
        /// <param name="filePath">配置文件路径</param>
        /// <returns>写入的数据字节长度</returns>
        [DllImport("kernel32.dll", EntryPoint = "WritePrivateProfileString")]
        private static extern long WritePrivateProfileString(string section, string key,
            string retVal, string filePath);

        /// <summary>
        /// 读取指定配置文件、指定节、指定键的值
        /// </summary>
        /// <param name="section">节点名</param>
        /// <param name="key">键名</param>
        /// <param name="def">默认值</param>
        /// <param name="retVal">返回值</param>
        /// <param name="size">缓冲区长度</param>
        /// <param name="filePath">配置文件路径</param>
        /// <returns>读取的数据字节长度</returns>
        [DllImport("kernel32.dll", EntryPoint = "GetPrivateProfileString")]
        private static extern int GetPrivateProfileString(string section, string key, string def,
            StringBuilder retVal, int size, string filePath);

        /// <summary>
        /// 读取指定配置文件、指定节的所有键值对
        /// </summary>
        /// <param name="section">节名</param>
        /// <param name="retVal">返回值（所有键和值）</param>
        /// <param name="size">缓冲区长度</param>
        /// <param name="filePath">配置文件路径</param>
        /// <returns>读取的数据字节长度</returns>
        [DllImport("kernel32.dll", EntryPoint = "GetPrivateProfileSection")]
        private static extern int GetPrivateProfileSection(string section,
            byte[] retVal, int size, string filePath);

        /// <summary>
        /// 读取指定配置文件的所有节名
        /// </summary>
        /// <param name="retVal">返回值（所有节名）</param>
        /// <param name="size">缓冲区长度</param>
        /// <param name="filePath">配置文件路径</param>
        /// <returns>读取的数据字节长度</returns>
        [DllImport("kernel32.dll", EntryPoint = "GetPrivateProfileSectionNames")]
        private static extern int GetPrivateProfileSectionNames(
            byte[] retVal, int size, string filePath);

        public static void WriteValue(string iniFilePath, string section, string key, string value)
        {
            WritePrivateProfileString(section, key, value, iniFilePath);
        }

        public static string ReadValue(string iniFilePath, string section, string key)
        {
            StringBuilder res = new StringBuilder(255);

            var len = GetPrivateProfileString(section, key, "", res, 255, iniFilePath);

            return res.ToString();
        }

        public static Dictionary<string, string> ReadSection(string iniFilePath, string section)
        {
            Dictionary<string, string> res = new Dictionary<string, string>();
            byte[] buffer = new byte[32768];
            var len = GetPrivateProfileSection(section, buffer, buffer.GetUpperBound(0), iniFilePath);
            var value = System.Text.Encoding.GetEncoding("GB2312").GetString(buffer, 0, len);
            //是C++中字符串的结尾标志，存储在字符串的结尾
            var items = value.Trim('').Split('');
            foreach (var item in items)
            {
                var temp = item.Split('=');
                res[temp[0]] = temp[1];
            }
            return res;
        }

        public static string[] ReadSectionNames(string iniFilePath)
        {
            byte[] buffer = new byte[1024];

            int len = GetPrivateProfileSectionNames(buffer, buffer.Length, iniFilePath);

            var value = System.Text.Encoding.GetEncoding("GB2312").GetString(buffer, 0, len);
            //是C++中字符串的结尾标志，存储在字符串的结尾
            var res = value.Trim('').Split('');

            return res;
        }
    }