在配置文件中添加新的配置节,并用新的方法访问。
用来演示的程序名为MyApp,Namespace也是MyApp
<configSections> <section name="AppConfig" type="MyApp.AppConfig, MyApp" /> </configSections> |
<AppConfig> <add key="ConnectionString" value="this is a ConnectionString" /> <add key="UserCount" value="199" /> </AppConfig> |
我们把所有的配置都映射成相应的静态成员变量,并且是写成只读属性,这样程序通过
类似AppConfig.ConnectionString就可以访问,配置文件中的项目了
using System.Collections.Specialized; using System.Xml; |
public class AppConfig : IConfigurationSectionHandler { static String m_connectionString = String.Empty; static Int32 m_userCount = 0; public static String ConnectionString { get { return m_connectionString; } } public static Int32 UserCount { get { return m_userCount; } } static String ReadSetting(NameValueCollection nvc, String key, String defaultValue) { String theValue = nvc[key]; if(theValue == String.Empty) return defaultValue; return theValue; } public object Create(object parent, object configContext, XmlNode section) { NameValueCollection settings; try { NameValueSectionHandler baseHandler = new NameValueSectionHandler(); settings = (NameValueCollection)baseHandler.Create(parent, configContext, section); } catch { settings = null; } if ( settings != null ) { m_connectionString = AppConfig.ReadSetting(settings, "ConnectionString", String.Empty); m_userCount = Convert.ToInt32(AppConfig.ReadSetting(settings, "UserCount", "0")); } return settings; } } |
在Global.asax.cs中的Application_Start中添加以下代码
这样在程序启动后,会读取AppConfig这个Section中的值,系统会调用你自己实现的IConfigurationSectionHandler接口来读取配置
System.Configuration.ConfigurationSettings.GetConfig("AppConfig"); |