c#对.ini文件的操作

 帮助类可以拿过去直接用

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Text;

namespace Mdm.Lite.Common.Helpers
{
    public static class IniHelper
    {
        // 声明INI文件的写操作函数 WritePrivateProfileString()  
        [DllImport("kernel32")]
        private static extern long WritePrivateProfileString(string section, string key, string val, string filePath);

        // 声明INI文件的读操作函数 GetPrivateProfileString()         
        [DllImport("kernel32", EntryPoint = "GetPrivateProfileString")]
        private static extern long GetPrivateProfileString(string section, string key,
            string def, StringBuilder retVal, int size, string filePath);

        [DllImport("kernel32", EntryPoint = "GetPrivateProfileString")]
        private static extern uint GetPrivateProfileStringA(string section, string key,
            string def, Byte[] retVal, int size, string filePath);


        /// <summary>
        /// 为某个节写入key
        /// 如果这个key已存在，那么久是更新此key
        /// </summary>
        /// <param name="section"></param>
        /// <param name="key"></param>
        /// <param name="sPath"></param>
        /// <returns></returns>
        public static void Write(string section, string key, string value,string sPath)
        {
            // section=配置节，key=键名，value=键值，path=路径  
            WritePrivateProfileString(section, key, value, sPath);
        }


        /// <summary>
        /// 读取某个key的值
        /// </summary>
        /// <param name="section"></param>
        /// <param name="key"></param>
        /// <param name="sPath"></param>
        /// <returns></returns>
        public static string ReadValue(string section, string key, string sPath)
        {
            // 每次从ini中读取多少字节 （最多2048个字符） 
            StringBuilder temp = new StringBuilder(2048);
            // section=配置节，key=键名，temp=上面，读取该键名的值最大长度，path=路径  
            GetPrivateProfileString(section, key, "", temp, 2048, sPath);
            return temp.ToString();
        }


        /// <summary>
        /// 读取所有的节
        /// </summary>
        /// <param name="iniFilename"></param>
        /// <returns></returns>
        public static List<string> ReadSections(string iniFilename)
        {
            List<string> result = new List<string>();
            Byte[] buf = new Byte[65536];
            uint len = GetPrivateProfileStringA(null, null, null, buf, buf.Length, iniFilename);
            int j = 0;
            for (int i = 0; i < len; i++)
            {
                if (buf[i] == 0)
                {
                    result.Add(Encoding.Default.GetString(buf, j, i - j));
                    j = i + 1;
                }
            }
            return result;
        }


        /// <summary>
        /// 读取节下所有的keys
        /// </summary>
        /// <param name="SectionName"></param>
        /// <param name="iniFilename"></param>
        /// <returns></returns>
        public static List<string> ReadKeys(string SectionName, string iniFilename)
        {
            List<string> result = new List<string>();
            Byte[] buf = new Byte[65536];
            uint len = GetPrivateProfileStringA(SectionName, null, null, buf, buf.Length, iniFilename);
            int j = 0;
            for (int i = 0; i < len; i++)
            {
                if (buf[i] == 0)
                {
                    result.Add(Encoding.Default.GetString(buf, j, i - j));
                    j = i + 1;
                }
            }   
            return result;
        }


        /// <summary>
        /// 删除某个节下的key
        /// </summary>
        /// <param name="section"></param>
        /// <param name="key"></param>
        /// <param name="sPath"></param>
        public static void DeleteKey(string section, string key, string sPath)
        {
            WritePrivateProfileString(section, key, null, sPath);
        }


        /// <summary>
        /// 删除某个节
        /// </summary>
        /// <param name="section"></param>
        /// <param name="sPath"></param>
        public static void DeleteSection(string section, string sPath)
        {
            WritePrivateProfileString(section, null, null, sPath);
        }
    }
}

了解ini文件的格式：

[section]

key=value

以上为一个ini文件的基本格式，section 是段落名，key是键名，value为键所对应的值。英文分号后面所有内容为注释内容

用法如代码所示：注意只可以修改对应的value值，不可以修改段落名或者key，如果有需要修改，那么就是先把原来的段落内容临时存下来，新建个段落，把要修改的段落的内容新增到新段落中，然后删除老段落。