#region 加密解密 static string encryptKey= "Oyea"; #region 加密字符串 public static string Encrypt(string str) /// <summary> /// 加密字符串 /// </summary> /// <param name="str">要加密的字符串</param> /// <returns>返回加密后的字符串</returns> public static string Encrypt(string str) {       DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();  //实例化加/解密类对象      byte[] key = Encoding.Unicode.GetBytes(encryptKey); //定义字节数组，用来存储密钥       byte[] data = Encoding.Unicode.GetBytes(str);//定义字节数组，用来存储要加密的字符串     MemoryStream MStream = new MemoryStream();//实例化内存流对象         //使用内存流实例化加密流对象      CryptoStream CStream = new CryptoStream(MStream,descsp.CreateEncryptor(key, key), CryptoStreamMode.Write);         CStream.Write(data,0, data.Length);  //向加密流中写入数据         CStream.FlushFinalBlock();             //释放加密流         return Convert.ToBase64String(MStream.ToArray());//返回加密后的字符串 } #endregion #region 解密字符串   public static string Decrypt(string str) /// <summary> /// 解密字符串 /// </summary> /// <param name="str">要解密的字符串</param> /// <returns>返回解密后的字符串</returns> public static string Decrypt(string str) {         DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();  //实例化加/解密类对象       byte[] key = Encoding.Unicode.GetBytes(encryptKey); //定义字节数组，用来存储密钥       byte[] data = Convert.FromBase64String(str);//定义字节数组，用来存储要解密的字符串     MemoryStream MStream = new MemoryStream();//实例化内存流对象         //使用内存流实例化解密流对象          CryptoStream CStream = new CryptoStream(MStream, descsp.CreateDecryptor(key, key), CryptoStreamMode.Write);       CStream.Write(data,0, data.Length);      //向解密流中写入数据        CStream.FlushFinalBlock();              //释放解密流         return Encoding.Unicode.GetString(MStream.ToArray());      //返回解密后的字符串 } #endregion #endregion