C# 对 App.config的appSettings节点数据进行加密

using System;
using System.Configuration;
using System.Collections.Generic;
namespace HTL{
    static class Program{
        /// <summary>
        /// 健值集合,用于保存数据到配置文件
        /// </summary>
        static Dictionary<string, string> key_value = new Dictionary<string, string>();
        [STAThread]
        public static void Main(string[] args)
        {
            key_value.Add("encrypt","加密");
            key_value.Add("test","测试");
            
            //加密AppSettings节点
            AddConfig(key_value,true);
            try    {
                Console.WriteLine("加密‘test‘的数据:"+System.Configuration.ConfigurationManager.AppSettings["test"]);
            }
            catch(Exception e)
            {
                Console.Write("读取AppSettings节点数据失败.错误信息:\r\n"+e.Message );
            }      
            //不加密AppSettings节点,如果不加密在前，加密在后则会出现错误“无法识别的属性“configProtectionProvider”。请注意属性名称区分大小写。”
                        AddConfig(key_value,false);
            try    {
                Console.WriteLine("未加密‘test‘的数据:"+System.Configuration.ConfigurationManager.AppSettings["test"]);
            }
            catch(Exception e)
            {
                Console.Write("读取AppSettings节点数据失败.错误信息:\r\n"+e.Message );
            }              
            Console.ReadKey();
        }
        /// <summary>
        ///　对appSettings节点添加健值
        ///　如果健已经存在则更改值
        ///　添加后重新保存并刷新该节点
        /// </summary>
        /// <param name="dict">添加的健值集合</param>
        /// <param name="isProtected">是否加密appSettings节点数据,如果为TrueappSettings节点下所有数据都会被加密</param>
        public static void AddConfig(System.Collections.Generic.Dictionary<string, string> dict, bool isProtected)
        {
            if (dict == null || dict.Count <= 0) return;
            System.Configuration.Configuration configuration =System.Configuration.ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            #region  //循环添加或更改健值
            foreach (System.Collections.Generic.KeyValuePair<string, string> key_value in dict)
            {
                if (string.IsNullOrEmpty(key_value.Key)) continue;
                if ( configuration.AppSettings.Settings[key_value.Key]!=null)
                    configuration.AppSettings.Settings[key_value.Key].Value = key_value.Value;
                else
                    configuration.AppSettings.Settings.Add(key_value.Key, key_value.Value);
            }//end foreach
            #endregion
            #region//保存配置文件
            try
            {
                //加密配置信息
                if (isProtected && !configuration.AppSettings.SectionInformation.IsProtected)
                {
                    configuration.AppSettings.SectionInformation.ForceSave = true;
                    configuration.AppSettings.SectionInformation.ProtectSection("DataProtectionConfigurationProvider");
                }
                configuration.Save();
            }
            catch (Exception)
            {
                throw;
            }
            ConfigurationManager.RefreshSection("appSettings");   
        ConfigurationManager.RefreshSection("configuration");
           }
       #endregion
        }
}