配置文件的写入和写出封装

1.AppConfig配置文件

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="DbTypeName" value="SQLServer,Oracle,MySQL,DB2" />
    <add key="OracleIP" value="192.168.1.1|Oracle" />
    <add key="OracleName" value="name1|Oracle" />
    <add key="OraclePwd" value="pwd1|Oracle" />
    <add key="OracleLink" value="哈哈|嘿嘿" />
    <add key="SqlServerIP" value="172.16.1.185|192.168.1.1|SqlServer" />
    <add key="SqlServerName" value="sa|SqlServer|name2" />
    <add key="SqlServerPwd" value="~!*%ForDevelop)20|pwd1|SqlServer" />
    <add key="SqlServerLink" value="Data Source=172.16.1.185;Initial Catalog=;User=sa;PassWord=~!*%ForDevelop)20;Connect Timeout=50|172.16.1.185|哈哈|嘿嘿" />
    <add key="MySqlIP" value="MySqlIP|192.168.1.2" />
    <add key="MySqlName" value="MySql|name2" />
    <add key="MySqlPwd" value="MySql|pwd2" />
    <add key="MySqlLink" value="哈哈|嘿嘿" />
    <add key="DB2IP" value="DB2IP|192.168.1.2" />
    <add key="DB2Name" value="DB2IP|name2" />
    <add key="DB2Pwd" value="DB2IP|pwd2" />
  </appSettings>
  <connectionStrings>
    <!--链接字符串 模板-->
    <add name="OracleLinkStr" connectionString="Data Source = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = ￥IP)(PORT = 1521))(CONNECT_DATA = (SERVICE_NAME = ￥ORCL))); Persist Security Info = True; User ID = ￥Name; Password = ￥PWD;" />
    <add name="SqlServerLinkStr" connectionString="Data Source=￥IP;Initial Catalog=;User=￥Name;PassWord=￥PWD;Connect Timeout=50" />
    <add name="MySqlLinkStr" connectionString="" />
  </connectionStrings>
</configuration>

1、读取：

  ConfigurationManager.AppSettings["节点名称"]?.ToString()?.Trim();

 ConfigurationManager.ConnectionStrings["节点名称"]?.ToString().Trim();

2、写入封装AppSetting：

  /// <summary>
        /// 写入
        /// </summary>
        /// <param name="appSettingNodeName"></param>
        private void SetConfigFileHelper(string appSettingNodeName, string value)
        {
            //最大保存数量
            int maxCount = 20;
            List<string> ipListSave = new List<string>();
            string ipStrAll = ConfigurationManager.AppSettings[appSettingNodeName].ToString().Trim();
            List<string> ipList = ipStrAll.Split(new char[] { '|' }, StringSplitOptions.RemoveEmptyEntries).ToList();
            if (ipList.Count > maxCount)
            {
                if (!string.IsNullOrWhiteSpace(value))
                {
                    ipListSave.Add(value);
                    for (int i = 0; i < maxCount - 1; i++)
                    {
                        ipListSave.Add(ipList[i]);
                    }
                }
                string ipStrValue = string.Join("|", ipListSave);
                SaveAppSetting(appSettingNodeName, ipStrValue);
            }
            else
            {
                if (!string.IsNullOrWhiteSpace(value))
                {
                    if (!ipList.Contains(value))
                    {
                        ipStrAll = value + "|" + ipStrAll;
                        SaveAppSetting(appSettingNodeName, ipStrAll);
                    }
                }
            }
        }


        /// <summary>
        /// 向配置文件中添加键值对，有则修改，无则添加
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void SaveAppSetting(string key, string value)
        {
            Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            //新增
            if (!ConfigurationManager.AppSettings.AllKeys.Contains(key))
            {

                config.AppSettings.Settings.Add(key, value);
                config.Save();
                return;
            }
            //修改
            else
            {
                config.AppSettings.Settings[key].Value = value;
                config.Save();

            }
            ConfigurationManager.RefreshSection("AppSettings");
        }

3、写入connectionStrings封装

  /// <summary>
        /// 向配置文件中添加键值对，有则修改，无则添加[connectionStrings节点]
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void SetConnectionStrings(string key, string value)
        {
            if (!ConfigurationManager.AppSettings.AllKeys.Contains(key))
            {
                Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                //config.ConnectionStrings.CurrentConfiguration.Add(value);
                config.Save();
                //return;
            }
            else
            {
                Configuration cfa = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                cfa.AppSettings.Settings[key].Value = value;
                cfa.Save();
            }
        }

        /// <summary>
        /// 更新连接字符串
        /// </summary>
        /// <param name="newName"></param>
        /// <param name="newConString"></param>
        /// <param name="newProviderName"></param>
        public void SetConnStriConfig(string newName, string newConString, string newProviderName)
        {
            bool isModified = false;    //记录该连接串是否已经存在
            if (ConfigurationManager.ConnectionStrings[newName] != null)
            {
                isModified = true;
            }
            //新建一个连接字符串实例
            ConnectionStringSettings mySettings = new ConnectionStringSettings(newName, newConString, newProviderName);

            // 打开可执行的配置文件*.exe.config
            Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

            // 如果连接串已存在，首先删除它
            if (isModified)
            {
                config.ConnectionStrings.ConnectionStrings.Remove(newName);
                // 将新的连接串添加到配置文件中.
                config.ConnectionStrings.ConnectionStrings.Add(mySettings);
                // 保存对配置文件所作的更改
                config.Save(ConfigurationSaveMode.Modified);
                // 强制重新载入配置文件的ConnectionStrings配置节 
                ConfigurationManager.RefreshSection("ConnectionStrings");
            }
        }