常见辅助类、方法

   public  class Log
    {
        private string Event { get; set; }
        private DateTime Time { get; set; }


        /// <summary>
        /// 日志记录，写入文件
        /// </summary>
        /// <param name="Eventname">事件名</param>
        /// <param name="Time">时间</param>
        public void RegisterLog(string Eventname, string Time)
        {            //判断是否已经有了这个文件
            if (!System.IO.File.Exists("log.txt"))
            {
                //没有则创建这个文件
                FileStream fs1 = new FileStream("log.txt", FileMode.Create, FileAccess.Write);//创建写入文件               
                System.IO.File.SetAttributes(@"log.txt", FileAttributes.Hidden); //设置文件属性为隐藏
                StreamWriter sw = new StreamWriter(fs1);
                sw.WriteLine(Eventname.Trim() + " " + Time.Trim());//开始写入值
                sw.Close();
                fs1.Close();
                //return "注册成功";
            }
            else
            {   //有则追加字符串
                FileStream fs = new FileStream("log.txt", FileMode.Append, FileAccess.Write);
                System.IO.File.SetAttributes(@"log.txt", FileAttributes.Hidden);
                StreamWriter sr = new StreamWriter(fs);
                sr.WriteLine(Eventname.Trim() + " " + Time.Trim());//开始写入值
                sr.Close();
                fs.Close();
                //  return "注册成功";
            }

        }

    }

        /// <summary>
        /// 字符串加密
        /// </summary>
        /// <param name="encryptString"></param>
        /// <returns></returns>
        public static string Encode(string encryptString)
        {
            try
            {
                string KEY = "zjp1202!";
                byte[] _vector = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

                var rgbKey = Encoding.UTF8.GetBytes(KEY.Substring(0, 8));
                var des = new DESCryptoServiceProvider();

                var inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                var ms = new MemoryStream();
                var cs = new CryptoStream(ms, des.CreateEncryptor(rgbKey, _vector), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();

                return Convert.ToBase64String(ms.ToArray());
            }
            catch (Exception ex)
            {
                return null;
            }
        }
       /// <summary>
       ///字符串解密
       /// </summary>
       /// <param name="decryptString"></param>
       /// <returns></returns>
        public static string Decode(string decryptString)
        {
            try
            {
                string KEY = "zjp1202!";
                byte[] _vector = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
                var provider = new DESCryptoServiceProvider();
                var rgbKey = Encoding.UTF8.GetBytes(KEY.Substring(0, 8));

                var inputByteArray = Convert.FromBase64String(decryptString);

                var ms = new MemoryStream();
                var cs = new CryptoStream(ms, provider.CreateDecryptor(rgbKey, _vector), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();

                var encoding = new UTF8Encoding();

                return encoding.GetString(ms.ToArray());
            }
            catch (Exception ex)
            {
                return null;
            }
        }

        public static string getConfig(string filename)
        {
            //读取网络上的txt文件
            //WebClient client = new WebClient();
            //byte[] buffer = client.DownloadData("http://域名/myset.txt");
            // FileStream file = new FileStream("\\config.txt", FileMode.Open);
            //byte[] buffer =
            byte[] buffer = ReadFile(filename);
            string res = System.Text.ASCIIEncoding.ASCII.GetString(buffer);
            string str = res.Replace("\r\n", ";");//读取的字符串(去掉换行符)
            //string[] items = str.Split(‘;‘);//放进数组里
            //for(int i=0;i<items.Length;i++)
            //{
            //}
            return str;
        }
        //读filename到byte[]
        public static byte[] ReadFile(string fileName)
        {
            FileStream fs = new FileStream(fileName, FileMode.OpenOrCreate);
            byte[] buffer = new byte[fs.Length];
            try
            {
                fs.Read(buffer, 0, buffer.Length);
                fs.Seek(0, SeekOrigin.Begin);
                return buffer;
            }
            catch
            {
                return buffer;
            }
            finally
            {
                if (fs != null)
                    fs.Close();
            }
        }