c# 操作ini文件

INI文件是一种按照特点方式排列的文本文件。每一个INI文件构成都非常类似，由若干段落（section）组成，在每个带括号的标题下面，是若干个以单个单词开头的关键词（keyword）和一个等号，等

号右边的就是关键字对应的值（value）。其一般形式如下：
[section1]
 keyword1=value1
 keyword2=value2
 keyword3=value3
[section2]
 keyword1=value1
 keyword2=value2

class Program

    {

        [DllImport("kernel32")]

        private  static extern long WritePrivateProfileString (string section ,string key , string val ,string filepath);

        //参数说明：section：INI文件中的段落；key：INI文件中的关键字；val：INI文件中关键字的数值；filePath：INI文件的完整的路径和名称。

        [DllImport ("kernel32")]

        private static extern int GetPrivateProfileString (string section , string key , string def , StringBuilder retVal , int size , string filePath ) ;

        //参数说明：section：INI文件中的段落名称；key：INI文件中的关键字；def：无法读取时候时候的缺省数值；retVal：读取数值；size：数值的大小；filePath：INI文件的完整路径和名称。

        public static void Main(string[] args)

        {

            

            string section="database";

            string key="sql";

            //string value="server.;database=pubs;uid=sa;pwd=";

            string fileName="d:\\config.ini";

            

            try

            {

                //写入ini节点

                //WritePrivateProfileString(section,key,value,fileName);

                

                //读取ini节点

                StringBuilder sb=new StringBuilder(255);

                GetPrivateProfileString(section,key,"无法读取",sb,255,fileName);

                

                Console.WriteLine(sb.ToString());

                

            }catch(Exception ex)

            {

                Console.WriteLine(ex.ToString());

            }

            

            Console.Write("Press any key to continue . . . ");

            Console.ReadKey(true);

        }

        

    }

整理出ini文件操作辅且类

 /// <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;
        }

    }