１）App.config 

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="color"   type="System.Configuration.NameValueSectionHandler" />
    <section name="message" type="System.Configuration.DictionarySectionHandler"/>
    <section name="name"   type="System.Configuration.SingleTagSectionHandler"/>
  </configSections>
  <color>
    <add key="red"   value="#ff0000"/>
    <add key="green" value="#00ff00"/>
    <add key="blue"  value="#0000ff"/>
  </color>
  <message>
    <add key="welcome" value="你好,欢迎"/>
  </message>
  <name firstName="陈" lastName="明明"/>

</configuration>

对于自定义的配置节，应该先在 <configSections>中声明要配置的节与类型，如着色部分，接着，在后面定义要配置的具体内容，正如定义一个变量。

 (2)配置节的访问

       public static void Main(string[] args)
        {
            //get color
            NameValueCollection color = (NameValueCollection)ConfigurationManager.GetSection("color");
            foreach (String str in color.AllKeys) {
                Console.WriteLine(str+":"+color[str]);
            }
            //get message
            IDictionary message = (IDictionary)ConfigurationManager.GetSection("message");
            foreach (String str in message.Keys) {
                Console.WriteLine(str+":"+message[str]);
            }
            // get name
            IDictionary name = (IDictionary)ConfigurationManager.GetSection("name");
            foreach (String str in name.Keys)
            {
                Console.WriteLine(str + ":" + name[str]);
            }   
            //Console.WriteLine(name["firstName"]);
            Console.Read();
        } 

转转 http://www.cnblogs.com/zengle_love/archive/2009/03/22/1419138.html