Net Framework Applictaion Configuration Note

在应用程序开发过程都要遇到编写XML的配置文件。一般在windows应用程序下面有个app.config XML文件，在Web Application 下面有个web.config已经机器的配置文件machine.config

1. 配置文件的基本内容，包括configuation root，然后是configuration sections

< configuration >
   < configSections >
     < section name = " enterpriseLibrary.ConfigurationSource "  type = " Microsoft.Practices.EnterpriseLibrary.Common.Configuration.ConfigurationSourceSection, Microsoft.Practices.EnterpriseLibrary.Common, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null "   />
   </ configSections >
   < enterpriseLibrary.ConfigurationSource selectedSource = " File Configuration Source " >
     < sources >
       < add name = " File Configuration Source "  type = " Microsoft.Practices.EnterpriseLibrary.Common.Configuration.FileConfigurationSource, Microsoft.Practices.EnterpriseLibrary.Common, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null "
        filePath = " path\to\external.config "   />
     </ sources >
   </ enterpriseLibrary.ConfigurationSource >
</ configuration >

2. 在程序中编程获得configuration setting

using  System.Configuration;


string  config  =  ConfigurationManager.AppSettings[ " config data " ];

3. 自定义配置文件处理方式,定义一个类实现IConfigurationSectionHandler 或者使用ConfigurationSection
具体的见MSDN
How to: Create Custom Configuration Sections Using IConfigurationSectionHandler
How to: Create Custom Configuration Sections Using ConfigurationSection