1、在web.Config的<configuration>节点下面添加 <appSettings>节点

<configuration>

   <appSettings>

      <add key="Node1" value="Node1Value"/>

      <add key="Node2" value="Node2Value"/>

      <add key="Node3" value="Node3Value"/>

  </appSettings>

</configuration>

2、获取appSettings节点下面的子节点的信息

       public static string GetNode1Value()

        {

            return ConfigurationSettings.AppSettings["Node1"];

        }

       public static string GetNode2Value()

        {

            return ConfigurationSettings.AppSettings["Node2"];

        }

       public static string GetNode3Value()

        {

            return ConfigurationSettings.AppSettings["Node3"];

        }

3、注意：ConfigurationSettings.AppSettings[]这种写法已经被System.Configuration.ConfigurationManager.AppSettings[]方法所替换，所以都用这种了：

public static string GetNode1Value()

        {

            return System.Configuration.ConfigurationManager.AppSettings["Node1"];

        }

       public static string GetNode2Value()

        {

            return System.Configuration.ConfigurationManager.AppSettings["Node2"];

        }

       public static string GetNode3Value()

        {

            return System.Configuration.ConfigurationManager.AppSettings["Node3"];

        }