用来演示的程序名为MyApp,Namespace也是MyApp
1。编辑web.config文件
添加以下内容,声明一个Section
<configSections>
<section name="AppConfig" type="MyApp.AppConfig, MyApp" />
</configSections>
声明了一个叫AppConfig的Section
2。编辑web.config文件
添加以下内容,加入一个Section
<AppConfig>
<add key="ConnectionString" value="this is a ConnectionString" />
<add key="UserCount" value="199" />
</AppConfig>
这个Section包括两个 Key
3。从IConfigurationSectionHandler派生一个类,AppConfig
实现Create方法,代码如下
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;
}
}
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
4。最后还要做一件事情
在Global.asax.cs中的Application_Start中添加以下代码
System.Configuration.ConfigurationSettings.GetConfig("AppConfig");
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
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