示例代码下载
一般情况下，包含配置元数据的文件为Windows应用程序的App.Config或Web应用程序的Web.Config文件.这里介绍如何使用外部的置元数据的文件.
通常的方法
首先下面的一段代码是通常的做法,在App.config中写入配置信息,程序中用到了两个Block: Data Access Application Block和Exception Application Block.
AppService.vb
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End Class
App.config
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="exceptionHandling" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Configuration.ExceptionHandlingSettings, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null" />
<section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null" />
</configSections>
<exceptionHandling>
<exceptionPolicies>
<add name="rippleyong's Policy">
<exceptionTypes>
<add type="System.Exception, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
postHandlingAction="NotifyRethrow" name="Exception">
<exceptionHandlers>
<add exceptionMessage="Replace ExceptionMessage,Haha !!!" replaceExceptionType="System.Exception, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.ReplaceHandler, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null"
name="Replace Handler" />
</exceptionHandlers>
</add>
</exceptionTypes>
</add>
</exceptionPolicies>
</exceptionHandling>
<connectionStrings>
<add name="rippleyong's ConnectionString" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|ripple.mdf;User Instance=true;"
providerName="System.Data.SqlClient" />
</connectionStrings>
</configuration>
调用外部的配置元数据文件(结合程序配置文件)
如何使用外部的扩展配置元数据文件呢,这里需要通过配置工具(Enterprise Library Configuration)添加一个Configuration Sources 节点在App.config(web.config)中.添加一个选择File Configuration Source,在File中选择外部的配置元数据文件(在这里是ExternalApp.config)
Configuration Source结构图
Enterprise Library Configuration
App.config
<?xml version="1.0" encoding="utf-8"?>
<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="System 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="C:\Documents and Settings\Administrator\My Documents\Visual Studio 2005\EnterpriseLibraryTest\EnterpriseLibraryTest\ExternalConfiguration\ExternalApp.config" />
<add name="System Configuration Source" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.SystemConfigurationSource, Microsoft.Practices.EnterpriseLibrary.Common, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null" />
</sources>
</enterpriseLibrary.ConfigurationSource>
</configuration>
ExternalApp.config
<configuration>
<configSections>
<section name="exceptionHandling" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Configuration.ExceptionHandlingSettings, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null" />
<section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null" />
</configSections>
<exceptionHandling>
<exceptionPolicies>
<add name="rippleyong's Policy">
<exceptionTypes>
<add type="System.Exception, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
postHandlingAction="NotifyRethrow" name="Exception">
<exceptionHandlers>
<add exceptionMessage="Rplace ExceptionMessage HaHa." replaceExceptionType="System.ApplicationException, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.ReplaceHandler, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null"
name="Replace Handler" />
</exceptionHandlers>
</add>
</exceptionTypes>
</add>
</exceptionPolicies>
</exceptionHandling>
<connectionStrings>
<add name="rippleyong's connetionString" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|ripple.mdf;User Instance=true;"
providerName="System.Data.SqlClient" />
</connectionStrings>
</configuration>
使用单独的ConfigurationSources
从上面的例子中我们可以看到,还是不是完全独立的,因为你必须在App.Config(Web.Config)中告诉Enterprise Library外部配置元数据文件的位置.
下面的代码演示了直接在程序中找到外部配置元数据文件.
data-filesource.config
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null" />
</configSections>
<connectionStrings>
<add name="rippleyng's Connection" connectionString="Database=ripple;Server=(local)\SQLEXPRESS;Integrated Security=SSPI;"
providerName="System.Data.SqlClient" />
</connectionStrings>
</configuration>
exception-filesource.config
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="exceptionHandling" type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Configuration.ExceptionHandlingSettings, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null" />
<section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null" />
</configSections>
<exceptionHandling>
<exceptionPolicies>
<add name="rippleyong's Policy">
<exceptionTypes>
<add type="System.Exception, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
postHandlingAction="ThrowNewException" name="Exception">
<exceptionHandlers>
<add exceptionMessage="Rplace ExceptionMessage HaHa." replaceExceptionType="System.ApplicationException, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
type="Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.ReplaceHandler, Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null"
name="Replace Handler" />
</exceptionHandlers>
</add>
</exceptionTypes>
</add>
</exceptionPolicies>
</exceptionHandling>
</configuration>