C#学习笔记——读写ini文件

using System;using System.Collections.Generic;using System.Linq;using System.Text;//引入命名空间using System.Collections.Specialized;using System.IO;  namespace ConfigFiles{     /// <summary>     /// IniFiles的类/// </summary>    public class IniFiles    {        public string FileName; //INI文件名          //声明读写INI文件的API函数          [System.Runtime.InteropServices.DllImport("kernel32")]        private static extern bool WritePrivateProfileString(string section, string key, string val, string filePath);        [System.Runtime.InteropServices.DllImport("kernel32")]        private static extern int GetPrivateProfileString(string section, string key, string def, byte[] retVal, int size, string filePath);        //类的构造函数，传递INI文件名        public IniFiles(string AFileName)        {            // 判断文件是否存在            FileInfo fileInfo = new FileInfo(AFileName);              //Todo:搞清枚举的用法            if ((!fileInfo.Exists))            { //|| (FileAttributes.Directory in fileInfo.Attributes))                //文件不存在，建立文件                System.IO.StreamWriter sw = new System.IO.StreamWriter(AFileName, false, System.Text.Encoding.Default);                try                {                    sw.Write("#应用程序配置文件");                    sw.Close();                }                  catch                {                    throw (new ApplicationException("Ini文件不存在"));                }            }              //必须是完全路径，不能是相对路径            FileName = fileInfo.FullName;        }          //写INI文件        public void WriteString(string Section, string Ident, string Value)        {            if (!WritePrivateProfileString(Section, Ident, Value, FileName))            {                throw (new ApplicationException("写Ini文件出错"));            }        }          //读取INI文件指定        public string ReadString(string Section, string Ident, string Default)        {            Byte[] Buffer = new Byte[65535];            int bufLen = GetPrivateProfileString(Section, Ident, Default, Buffer, Buffer.GetUpperBound(0), FileName);            //必须设定0（系统默认的代码页）的编码方式，否则无法支持中文            string s = Encoding.GetEncoding(0).GetString(Buffer);            s = s.Substring(0, bufLen);            return s.Trim();        }          //读整数        public int ReadInteger(string Section, string Ident, int Default)        {            string intStr = ReadString(Section, Ident, Convert.ToString(Default));            try            {                return Convert.ToInt32(intStr);              }            catch (Exception ex)            {            Console.WriteLine(ex.Message);                return Default;            }        }          //写整数        public void WriteInteger(string Section, string Ident, int Value)        {            WriteString(Section, Ident, Value.ToString());        }          //读布尔        public bool ReadBool(string Section, string Ident, bool Default)        {            try            {                return Convert.ToBoolean(ReadString(Section, Ident, Convert.ToString(Default)));            }            catch (Exception ex)            {                Console.WriteLine(ex.Message);                return Default;            }        }          //写Bool        public void WriteBool(string Section, string Ident, bool Value)        {            WriteString(Section, Ident, Convert.ToString(Value));        }          //从Ini文件中，将指定的Section名称中的所有Ident添加到列表中        public void ReadSection(string Section, StringCollection Idents)        {            Byte[] Buffer = new Byte[16384];            //Idents.Clear();              int bufLen = GetPrivateProfileString(Section, null, null, Buffer, Buffer.GetUpperBound(0),            FileName);            //对Section进行解析            GetStringsFromBuffer(Buffer, bufLen, Idents);        }          private void GetStringsFromBuffer(Byte[] Buffer, int bufLen, StringCollection Strings)        {            Strings.Clear();            if (bufLen != 0)            {            int start = 0;            for (int i = 0; i < bufLen; i++)                {                    if ((Buffer[i] == 0) && ((i - start) > 0))                    {                        String s = Encoding.GetEncoding(0).GetString(Buffer, start, i - start);                        Strings.Add(s);                        start = i + 1;                    }                }            }        }          //从Ini文件中，读取所有的Sections的名称        public void ReadSections(StringCollection SectionList)        {            //Note:必须得用Bytes来实现，StringBuilder只能取到第一个Section            byte[] Buffer = new byte[65535];            int bufLen = 0;            bufLen = GetPrivateProfileString(null, null, null, Buffer,            Buffer.GetUpperBound(0), FileName);            GetStringsFromBuffer(Buffer, bufLen, SectionList);        }          //读取指定的Section的所有Value到列表中        public void ReadSectionValues(string Section, NameValueCollection Values)        {            StringCollection KeyList = new StringCollection();            ReadSection(Section, KeyList);            Values.Clear();            foreach (string key in KeyList)            {                Values.Add(key, ReadString(Section, key, ""));              }        }           //清除某个Section        public void EraseSection(string Section)        {        //            if (!WritePrivateProfileString(Section, null, null, FileName))            {                  throw (new ApplicationException("无法清除Ini文件中的Section"));            }        }          //删除某个Section下的键        public void DeleteKey(string Section, string Ident)        {            WritePrivateProfileString(Section, Ident, null, FileName);        }         //Note:对于Win9X，来说需要实现UpdateFile方法将缓冲中的数据写入文件        //在Win NT, 2000和XP上，都是直接写文件，没有缓冲，所以，无须实现UpdateFile        //执行完对Ini文件的修改之后，应该调用本方法更新缓冲区。        public void UpdateFile()        {            WritePrivateProfileString(null, null, null, FileName);        }          //检查某个Section下的某个键值是否存在        public bool ValueExists(string Section, string Ident)        {            StringCollection Idents = new StringCollection();            ReadSection(Section, Idents);            return Idents.IndexOf(Ident) > -1;        }          //确保资源的释放        ~IniFiles()        {            UpdateFile();        }    }}