ef 数据库连接字符串加密（记录）

来源：https://www.cnblogs.com/xszjk/articles/EFConfig.html
来源：https://blog.csdn.net/qdluo/article/details/81391503

特此记录下
找到模型数据

打开

修改为

注意：
sb是我自己写的类（最近有点恼火）
定义如下方法

  public static string ConnectionString
        {

            get
            {
                string _connectionString =    ConfigurationManager.ConnectionStrings["kkkEntities"].ConnectionString;
                string ConStringEncrypt = ConfigurationManager.AppSettings["ConStringEncrypt"];
                if (ConStringEncrypt == "true")
                {
                    sb Sb = new sb();
                    _connectionString = Sb.Decrypt(_connectionString);
                }
                return _connectionString;

          
            }
        }

ConfigurationManager.AppSettings[“ConStringEncrypt”];
这句的作用是，连接字符串是否加密。机智的做法！！
可以在配置文件中定义

由于我用的EF框架 提供一个没加密的字符串

string Mysql = string.Format("metadata=res://*/KeyouModel.csdl|res://*/KeyouModel.ssdl|res://*/KeyouModel.msl;provider=MySql.Data.MySqlClient;provider connection string=\"; server = {0}; user id = {1}; password = {2}; persistsecurityinfo = True; database = {3}\";", IP, UserName, UserPwd, BaseName);

关于加密

来源:https://www.cnblogs.com/wifi/articles/2482350.html

 public class sb
    {
        static string encryptKey = "Cnmd";    //定义密钥  四个字符 随意写 

        #region 加密字符串  
        /// 
 /// 加密字符串   
        /// 
  
        /// 要加密的字符串  
        /// 加密后的字符串  
        public  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   
        /// 
  
        /// 解密字符串   
        /// 
  
        /// 要解密的字符串  
        /// 解密后的字符串  
        public  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
//模型需要解密的字符串 与加解密无关
        public static string ConnectionString
        {

            get
            {
                string _connectionString = ConfigurationManager.ConnectionStrings["keyouEntities"].ConnectionString;
                string ConStringEncrypt = ConfigurationManager.AppSettings["ConStringEncrypt"];
                if (ConStringEncrypt == "true")
                {
                    sb Sb = new sb();
                    _connectionString = Sb.Decrypt(_connectionString);
                }
                return _connectionString;

          
            }
        }

    }

加密连接字符串的时候要注意，"“是双引号，加密时要将其改为” "才可以，不然会报出data source关键字的错误！