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 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,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 path)
        {
            StringBuilder temp = new StringBuilder(255);
            int i = GetPrivateProfileString(Section,"",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('');
            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;
        }

    }