WinForm OR ASP.NET获取修改配置文件config的节点

获取appSettings节点下 键值对

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="versions" value="1.0.0.0"/>
    <add key="terminal" value="1"/>
  </appSettings>
</configuration>

代码如下：

System.Configuration.AppSettingsReader appSettings = new System.Configuration.AppSettingsReader();
appSettings.GetValue("versions", Type.GetType("System.String")).ToString();

获取Connectionstings节点 

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
    </configSections>
    <connectionStrings>
        <add name="ConnStr"  connectionString="server=.;database=dbTest;uid=sa;pwd=123456;"/>
    </connectionStrings>
</configuration>

代码如下：

using System.Configuration; 

string con=ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString; 

修改appSettings节点

/// <summary>
        /// 修改键值
        /// </summary>
        /// <param name="key">健</param>
        /// <param name="value">值</param>
        public static void saveAppSetting(string key, string value)
        {
            System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            config.AppSettings.Settings[key].Value = value;
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("appSettings");
        }