C#修改INI文件时，只会新增新节点。读取节点都为空问题

解决办法：

用记事本打开INI文件，点击菜单栏文件-->另存为-->编码选择UTF-8,然后保存就可以了。

 

C#操作INI工具类：

 

 

 

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

namespace Common
{
    /// <summary>
    /// INI文件读写类。  
    /// </summary>
    public class INIFile
    {
        public string path;

        public INIFile(string INIPath)
        {
            path = INIPath;
        }

        [DllImport("kernel32")]
        private static extern long WritePrivateProfileString(string section, string key, string val, string filePath);

        [DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int size, string filePath);


        [DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string section, string key, string defVal, Byte[] retVal, int size, string filePath);

        [DllImport("kernel32.dll")]
        private static extern int GetPrivateProfileInt(string lpAppName, string lpKeyName, int nDefault, string lpFileName);

        [DllImport("kernel32.dll", EntryPoint = "GetPrivateProfileSectionNames", CharSet = CharSet.Ansi)]
        private static extern int GetPrivateProfileSectionNames(IntPtr lpszReturnBuffer, int nSize, string filePath);

        [DllImport("KERNEL32.DLL ", EntryPoint = "GetPrivateProfileSection", CharSet = CharSet.Ansi)]
        private static extern int GetPrivateProfileSection(string lpAppName, byte[] lpReturnedString, int nSize, string filePath);

        /// <summary>
        /// 写INI文件
        /// </summary>
        /// <param name="Section"></param>
        /// <param name="Key"></param>
        /// <param name="Value"></param>
        public void IniWriteValue(string Section, string Key, string Value)
        {
            WritePrivateProfileString(Section, Key, Value, this.path);
        }

        /// <summary>
        /// 读取INI文件
        /// </summary>
        /// <param name="Section"></param>
        /// <param name="Key"></param>
        /// <returns></returns>
        public string IniReadValue(string Section, string Key)
        {
            StringBuilder temp = new StringBuilder(1024);
            int i = GetPrivateProfileString(Section, Key, "", temp, 1024, this.path);
            return temp.ToString();
        }

        public string IniReadValue(string Section, string Key, int size)
        {
            StringBuilder temp = new StringBuilder(size);
            int i = GetPrivateProfileString(Section, Key, "", temp, size, this.path);
            return temp.ToString();
        }

        public int ReadInt(string Section, string Key)
        {
            int def = 0;
            return GetPrivateProfileInt(Section, Key, def, this.path);
        }

        public byte[] IniReadValues(string section, string key)
        {
            byte[] temp = new byte[1024];
            int i = GetPrivateProfileString(section, key, "", temp, 1024, this.path);
            return temp;

        }


        /// <summary>
        /// 删除ini文件下所有段落
        /// </summary>
        public void ClearAllSection()
        {
            IniWriteValue(null, null, null);
        }
        /// <summary>
        /// 删除ini文件下personal段落下的所有键
        /// </summary>
        /// <param name="Section"></param>
        public void ClearSection(string Section)
        {
            IniWriteValue(Section, null, null);
        }

        /// <summary>
        /// 返回指定配置文件下的节名称列表
        /// </summary>
        /// <returns></returns>
        public List<string> GetAllSectionNames()
        {
            List<string> sectionList = new List<string>();
            int MAX_BUFFER = 32767;
            IntPtr pReturnedString = Marshal.AllocCoTaskMem(MAX_BUFFER);
            int bytesReturned = GetPrivateProfileSectionNames(pReturnedString, MAX_BUFFER, this.path);
            if (bytesReturned != 0)
            {
                string local = Marshal.PtrToStringAnsi(pReturnedString, (int)bytesReturned).ToString();
                Marshal.FreeCoTaskMem(pReturnedString);
                sectionList.AddRange(local.Substring(0, local.Length - 1).Split('\0'));
            }
            return sectionList;
        }

        /// <summary>
        /// 得到某个节点下面所有的key和value组合
        /// </summary>
        /// <param name="section">指定的节名称</param>
        /// <param name="keys">Key数组</param>
        /// <param name="values">Value数组</param>
        /// <param name="path">INI文件路径</param>
        /// <returns></returns>
        public Hashtable GetAllKeyValues(string section)
        {
            Hashtable ht = new Hashtable();

            byte[] b = new byte[65535];//配置节下的所有信息
            GetPrivateProfileSection(section, b, b.Length, this.path);
            string s = System.Text.Encoding.Default.GetString(b);//配置信息
            string[] tmp = s.Split((char)0);//Key\Value信息
            List<string> result = new List<string>();
            foreach (string r in tmp)
            {
                if (r != string.Empty)
                    result.Add(r);
            }

            for (int i = 0; i < result.Count; i++)
            {
                string[] item = result[i].Split(new char[] { '=' });//Key=Value格式的配置信息
                string key = item[0].Trim();

                //Value字符串中含有=的处理，
                //一、Value加""，先对""处理
                //二、Key后续的都为Value
                if (item.Length > 2)
                {
                    ht.Add(key, result[i].Substring(key.Length + 1));
                }
                if (item.Length == 2)//Key=Value
                {
                    ht.Add(key, item[1].Trim());
                }
                else if (item.Length == 1)//Key=
                {
                    ht.Add(key, "");
                }
                else if (item.Length == 0)
                {
                    //ht.Add("", "");
                }
            }
            return ht;
        }

    }

}