web.config文件自定義配置節的使用方法的一個簡單例子
用來演示的程序名爲MyApp,Namespace也是MyApp
1。編輯web.config文件
添加以下內容,聲明一個Section
<configSections>
<section name="AppConfig" type="MyApp.AppConfig, MyApp" />
</configSections>
聲明瞭一個叫AppConfig的Section
2。編輯web.config文件
添加以下內容,加入一個Section
<AppConfig>
<add key="ConnectionString" value="this is a ConnectionString" />
<add key="UserCount" value="199" />
</AppConfig>
這個Section包括兩個 Key
3。從IConfigurationSectionHandler派生一個類,AppConfig
實現Create方法,代碼如下
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;
}
}
我們把所有的配置都映射成相應的靜態成員變量,並且是寫成只讀屬性,這樣程序通過
類似AppConfig.ConnectionString就可以訪問,配置文件中的項目了
4。最後還要做一件事情
在Global.asax.cs中的Application_Start中添加以下代碼
System.Configuration.ConfigurationSettings.GetConfig("AppConfig");
這樣在程序啓動後,會讀取AppConfig這個Section中的值,系統會調用你自己實現的IConfigurationSectionHandler接口來讀取配置
參考信息二Duwamish深入剖析-配置篇
http://www.microsoft.com/china/community/program/originalarticles/TechDoc/duwamish_con.mspx