/// <summary>
    /// INI文件操作类 
    /// </summary>
    public class INIClass
    {
        [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);
        /// <summary>
        /// ini文件路径
        /// </summary>
        public string inipath;
        public INIClass()
        { }
        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="INIPath">ini文件路径</param>
        public INIClass(string INIPath)
        {
            this.inipath = INIPath;
        }
        /// <summary>
        /// 写入INI文件
        /// </summary>
        /// <param name="section">项目名称(如[TypeName])</param>
        /// <param name="key">键</param>
        /// <param name="value">值</param>
        public void IniWriteValue(string section, string key, string value)
        {
            WritePrivateProfileString(section, key, value, this.inipath);
        }
        /// <summary>
        /// 读出INI文件
        /// </summary>
        /// <param name="section">项目名称(如[TypeName])</param>
        /// <param name="key">键</param>
        /// <returns>string</returns>
        public string IniReadValue(string section, string key)
        {
            StringBuilder temp = new StringBuilder(500);
            int i = GetPrivateProfileString(section, key, "", temp, 500, this.inipath);
            return temp.ToString();
        }
        /// <summary>
        /// 验证文件是否存在
        /// </summary>
        /// <returns>bool</returns>
        public bool ExistINIFile()
        {
            return File.Exists(this.inipath);
        }
    }

 public class IniClassDemo
    {
        private static readonly string filePath = @"document/testdemo.ini";
        INIClass iC = new INIClass(filePath);
        //判断文件是否存在
        public bool IsExist()
        {
            return iC.ExistINIFile();
        }
        //写入INI文件
        public void IniWrite(string section,string key,string value)
        {
            iC.IniWriteValue(section, key, value);
        }
        //读取INI文件内容
        public string IniRead(string section,string key)
        {
            string temp = iC.IniReadValue(section, key);
            return temp;
        }
        public void GoTo()
        {
            if (IsExist())
            {
                Console.WriteLine("文件存在 ");
                IniWrite("test01", "aib", "gdaib");
                Console.WriteLine("写入文件完毕，section=test01,key=aib,value=gdaib");
                Console.WriteLine("读取刚写的文件,内容为: " + IniRead("test01", "aib"));
            }
            else
            {
                Console.WriteLine("文件不存在！");
            }
        }
        
    }