使用IConfigurationSectionHandler在web.config中增长自定义配置

一. 场景
    这里仅举一个简单应用的例子，我但愿在web.config里面增长网站的基本信息，如：网站名称，网站版本号，是否将网站暂时关闭等。
二. 基本实现方法
1. 定义配置节点对应的类：SiteSetting
    代码片断：
    
namespace Tristan.SeeCustomConfig {
    public class SiteSetting {
        public string SiteName { get; set; }
        public string SiteVersion { get; set; }
        public bool Closed { get; set; }
    }
}

2. 实现IConfigurationSectionHandler接口：SiteSettingHandler
   

namespace Tristan.SeeCustomConfig {
    public class SiteSettingHandler : IConfigurationSectionHandler {
        #region IConfigurationSectionHandler Members

        public object Create(object parent, object configContext, System.Xml.XmlNode section) {
            string siteName = section.SelectSingleNode("siteName").InnerText;
            string siteVersiton = section.SelectSingleNode("siteVersion").InnerText;
            bool closed = Convert.ToBoolean(section.SelectSingleNode("closed").InnerText);
            return new SiteSetting() { SiteName = siteName, SiteVersion = siteVersiton };
        }

        #endregion
    }
}

3. 在web.config中进行配置
    在<configSections></configSections>里面增长一个节点：
<section name="siteSetting" type="Tristan.SeeCustomConfig.SiteSettingHandler"/>

    name：指定咱们将要增长的节点名为"siteSetting"，接下来会使用它来编写配置节点
    type：指定处理这个配置节点的handler，这个类，咱们在前面已经把代码实现了
    而后在<configuration><configuration>里面增长一段xml：
<siteSetting>
        <siteName>碰见将来</siteName>
        <siteVersion>1.0</siteVersion>
    <closed>false</closed>
    </siteSetting>

4. 看看效果吧
    随便建一个页面在后台代码里写几行代码作个测试：
    
namespace Tristan.SeeCustomConfig {
    public partial class _Default : System.Web.UI.Page {
        protected void Page_Load(object sender, EventArgs e) {
            SiteSetting site = ConfigurationManager.GetSection("siteSetting") as SiteSetting;
            Response.Write(site.SiteName + "," + site.SiteVersion + "," + site.Closed.ToString());
        }
    }
}

    运行，能够看到，咱们在web.config中的信息被write出来了。 ：）
三. 使用XML反序列化
1. 修改SiteSetting
    
namespace Tristan.SeeCustomConfig {

    [Serializable]
    [XmlRoot("siteSetting")]
    public class SiteSetting {
        [XmlElement("siteName",typeof(string))]
        public string SiteName { get; set; }

        [XmlElement("siteVersion",typeof(string))]
        public string SiteVersion { get; set; }

        [XmlElement("closed",typeof(Boolean))]
        public bool Closed { get; set; }
    }
}

2. 修改SiteSettingHandler
   

namespace Tristan.SeeCustomConfig {
    public class SiteSettingHandler : IConfigurationSectionHandler {
        #region IConfigurationSectionHandler Members

        public object Create(object parent, object configContext, System.Xml.XmlNode section) {
            //string siteName = section.SelectSingleNode("siteName").InnerText;
            //string siteVersiton = section.SelectSingleNode("siteVersion").InnerText;
            //bool closed = Convert.ToBoolean(section.SelectSingleNode("closed").InnerText);
            //return new SiteSetting() { SiteName = siteName, SiteVersion = siteVersiton };

            string typeName = ((XmlElement)section).GetAttribute("type");
            XmlSerializer xz = new XmlSerializer(Type.GetType(typeName));
            using (StringReader sr = new StringReader(section.OuterXml)) {
                return xz.Deserialize(sr);
            }
        }

        #endregion
    }
}

3. 修改web.config中的配置
    
<siteSetting type="Tristan.SeeCustomConfig.SiteSetting">
        <siteName>碰见将来</siteName>
        <siteVersion>1.0</siteVersion>
    <closed>false</closed>
    </siteSetting>

4. 再来看看    不修改测试代码，获得了同样的效果 ：）