c#实现ini文件读写类分享

/// <summary>
    /// 读写ini文件的类。
    /// </summary>
    public class inihelper
    {
        // 读写ini文件相关。
        [dllimport("kernel32.dll", entrypoint = "writeprivateprofilestring", charset = charset.ansi)]
        public static extern long writeprivateprofilestring(string section, string key, string val, string filepath);
        [dllimport("kernel32.dll", entrypoint = "getprivateprofilestring", charset = charset.ansi)]
        public static extern int getprivateprofilestring(string section, string key, string def, stringbuilder retval, int size, string filepath);

        [dllimport("kernel32.dll", entrypoint = "getprivateprofilesectionnames", charset = charset.ansi)]
        public static extern int getprivateprofilesectionnames(intptr lpszreturnbuffer, int nsize, string filepath);

        [dllimport("kernel32.dll ", entrypoint = "getprivateprofilesection", charset = charset.ansi)]
        public static extern int getprivateprofilesection(string lpappname, byte[] lpreturnedstring, int nsize, string filepath);

        /// <summary>
        /// 向ini写入数据。
        /// </summary>
        /// <param name="section">节点名。</param>
        /// <param name="key">键名。</param>
        /// <param name="value">值名。</param>
        public static void write(string section, string key, string value, string path)
        {
            writeprivateprofilestring(section, key, value, path);
        }

        /// <summary>
        /// 读取ini数据。
        /// </summary>
        /// <param name="section">节点名。</param>
        /// <param name="key">键名。</param>
        /// <param name="path">值名。</param>
        /// <returns>相应的值。</returns>
        public static string read(string section, string key, string path)
        {
            stringbuilder temp = new stringbuilder(255);
            int i = getprivateprofilestring(section, key, "", temp, 255, path);
            return temp.tostring();
        }

        /// <summary>
        /// 读取一个ini里面所有的节
        /// </summary>
        /// <param name="sections"></param>
        /// <param name="path"></param>
        /// <returns></returns>
        public static int getallsectionnames(out string[] sections, string path)
        {
            int max_buffer = 32767;
            intptr preturnedstring = marshal.alloccotaskmem(max_buffer);
            int bytesreturned = getprivateprofilesectionnames(preturnedstring, max_buffer, path);
            if (bytesreturned == 0)
            {
                sections = null;
                return -1;
            }
            string local = marshal.ptrtostringansi(preturnedstring, (int)bytesreturned).tostring();
            marshal.freecotaskmem(preturnedstring);
            //use of substring below removes terminating null for split
            sections = local.substring(0, local.length - 1).split('\0');
            return 0;
        }

        /// <summary>
        /// 得到某个节点下面所有的key和value组合
        /// </summary>
        /// <param name="section"></param>
        /// <param name="keys"></param>
        /// <param name="values"></param>
        /// <param name="path"></param>
        /// <returns></returns>
        public static int getallkeyvalues(string section, out string[] keys, out string[] values, string path)
        {
            byte[] b = new byte[65535];

            getprivateprofilesection(section, b, b.length, path);
            string s = system.text.encoding.default.getstring(b);
            string[] tmp = s.split((char)0);
            arraylist result = new arraylist();
            foreach (string r in tmp)
            {
                if (r != string.empty)
                    result.add(r);
            }
            keys = new string[result.count];
            values = new string[result.count];
            for (int i = 0; i < result.count; i++)
            {
                string[] item = result[i].tostring().split(new char[] { '=' });
                if (item.length == 2)
                {
                    keys[i] = item[0].trim();
                    values[i] = item[1].trim();
                }
                else if (item.length == 1)
                {
                    keys[i] = item[0].trim();
                    values[i] = "";
                }
                else if (item.length == 0)
                {
                    keys[i] = "";
                    values[i] = "";
                }
            }

            return 0;
        }

    }