摘要：EnterpriseLibrary Configuration Facility就好像是在容器和数据类之间的桥，让我们可以轻松得去读取和操作配置文件。熟悉Enterprise Library的人都知道，在Enterprise Library中有一个Configuration Application Block，它可以使我们方便的从各种存储中读写配置信息，通过EnterpriseLibrary Configuration Facility我们就可以像使用普通的组件那样去注册一个数据类，它会用configurationkey来映射到Enterprise Library的配置文件中。
主要内容：
1
．概述
2
．使用Facility
3
．原理浅析
一．概述
EnterpriseLibrary Configuration Facility
就好像是在容器和数据类之间的桥，让我们可以轻松得去读取和操作配置文件。熟悉Enterprise Library的人都知道，在Enterprise Library中有一个Configuration Application Block，它可以使我们方便的从各种存储中读写配置信息，通过EnterpriseLibrary Configuration Facility我们就可以像使用普通的组件那样去注册一个数据类，它会用configurationkey来映射到Enterprise Library的配置文件中。先来看一下该Facility的相关信息：
|
Facility Information
|
|
|
Uses Proxy
|
No
|
|
Requires Configuration
|
Yes
|
|
Uses Attributes
|
No
|
|
Version
|
Beta 2
|
二．使用Facility
1
．配置文件，这里使用配置文件注册组件的方式，放在应用程序配置文件中，这里唯一需要注意的是configurationkey，这个特性不能写错：
<?
xml version="1.0" encoding="utf-8"
?>
<
configuration
>
<
configSections
>
<
section
name
="enterpriselibrary.configurationSettings"
type
="System.Configuration.IgnoreSectionHandler, System, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
/>
<
section
name
="castle"
type
="Castle.Windsor.Configuration.AppDomain.CastleSectionHandler, Castle.Windsor"
/>
</
configSections
>
<
enterpriselibrary
.configurationSettings xmlns:xsd
="http://www.w3.org/2001/XMLSchema"
xmlns:xsi
="http://www.w3.org/2001/XMLSchema-instance"
defaultSection
=""
applicationName
="Application"
xmlns
="http://www.microsoft.com/practices/enterpriselibrary/08-31-2004/configuration"
>
<
configurationSections
>
<
configurationSection
name
="EditorSettings"
encrypt
="false"
>
<
storageProvider
xsi:type
="XmlFileStorageProviderData"
name
="XML File Storage Provider"
path
="../../EditorSettings.config"
/>
<
dataTransformer
xsi:type
="XmlSerializerTransformerData"
name
="Xml Serializer Transformer"
>
<
includeTypes
/>
</
dataTransformer
>
</
configurationSection
>
</
configurationSections
>
<
keyAlgorithmStorageProvider
xsi:nil
="true"
/>
</
enterpriselibrary.configurationSettings
>
<
castle
>
<
facilities
>
<
facility
id
="configuration"
type
="Castle.Facilities.EnterpriseLibrary.Configuration.EnterpriseConfigurationFacility, Castle.Facilities.EnterpriseLibrary.Configuration"
/>
</
facilities
>
<
components
>
<
component
id
="editorfontdata"
type
="ConfigurationQuickStart.EditorFontData, Castle.Facilities.EnterpriseLibrary.Configuration.Tests"
configurationkey
="EditorSettings"
/>
<
component
id
="editorservice"
type
="Castle.Facilities.EnterpriseLibrary.Configuration.Tests.EditorService, Castle.Facilities.EnterpriseLibrary.Configuration.Tests"
/>
</
components
>
</
castle
>
</
configuration
>
2
．编写数据类文件：
public
class
EditorFontData
{ 
private string name; private float size; private int style; public EditorFontData()
{ 
} public string Name { get{ return name; } set{ name = value; } } public float Size { get{ return size; } set{ size = value; } } public int Style { get{ return style; } set{ style = value; } } public override string ToString() { StringBuilder sb = new StringBuilder(); sb.AppendFormat("Name = {0}; Size = {1}; Style = {2}", name, size.ToString(), style.ToString()); return sb.ToString(); }
}
3
．采用XML方式的存储
<?
xml version="1.0" encoding="utf-8"
?>
<
EditorSettings
>
<
xmlSerializerSection
type
="ConfigurationQuickStart.EditorFontData, Castle.Facilities.EnterpriseLibrary.Configuration.Tests, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
>
<
EditorFontData
xmlns:xsd
="http://www.w3.org/2001/XMLSchema"
xmlns:xsi
="http://www.w3.org/2001/XMLSchema-instance"
>
<
Name
>
Microsoft Sans Serif
</
Name
>
<
Size
>
9.25
</
Size
>
<
Style
>
0
</
Style
>
</
EditorFontData
>
</
xmlSerializerSection
>
</
EditorSettings
>
4
．使用数据类的组件
public
class
EditorService
{ private readonly EditorFontData data; public EditorService(EditorFontData data) { this.data = data; } public EditorFontData Data { get { return data; } }}
5
．在容器中使用数据类
[TestFixture]
public
class
FacilityTestCase
{ [Test] public void LoadingConfig() { IWindsorContainer container = new WindsorContainer( new XmlInterpreter(new AppDomainConfigSource()) ); EditorService service = (EditorService) container[ typeof(EditorService) ]; Assert.AreEqual("Microsoft Sans Serif", service.Data.Name); Assert.AreEqual(9.25,service.Data.Size); }}
可以看到，使用
EnterpriseLibrary Configuration Facility非常的简单。最后还要注意一点，使用这个
Facility需要安装
Enterprise Library，因为它依赖于：
Microsoft.Practices.EnterpriseLibrary.Common.dllMicrosoft.Practices.EnterpriseLibrary.Configuration.dll
三．原理分析
下面对这个Facility的原理做一下简单的分析。在初始化的时候，它注册了一个名为
EntLibConfigurationInspector
的分发器
public
class
EnterpriseConfigurationFacility : AbstractFacility
{ protected override void Init() {Kernel.ComponentModelBuilder.AddContributor( new EntLibConfigurationInspector() ); }}
internal
class
EntLibConfigurationInspector : IContributeComponentModelConstruction
{ public void ProcessModel(IKernel kernel, ComponentModel model) { if (model.Configuration == null) return; String configKey = model.Configuration.Attributes["configurationkey"]; if (configKey == null) return; model.ExtendedProperties["configurationkey"] = configKey; model.CustomComponentActivator = typeof(EntLibComponentActivator); }}
在
EntLibConfigurationInspector中为
ComponentModel注册一个
CustomComponentActivator类型的
Activator，这个
CustomComponentActivator的实现为
EntLibComponentActivator。
internal
class
EntLibComponentActivator : AbstractComponentActivator
{ public EntLibComponentActivator(ComponentModel model, IKernel kernel, ComponentInstanceDelegate onCreation, ComponentInstanceDelegate onDestruction) : base(model, kernel, onCreation, onDestruction) { } protected override object InternalCreate() { String configKey = (String) Model.ExtendedProperties["configurationkey"]; return ConfigurationManager.GetConfiguration(configKey); } protected override void InternalDestroy(object instance) { String configKey = (String) Model.ExtendedProperties["configurationkey"]; ConfigurationManager.WriteConfiguration(configKey, instance); }}
好了，关于 EnterpriseLibrary Configuration Facility就简单的介绍到这里。
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本文转自lihuijun51CTO博客，原文链接：
http://blog.51cto.com/terrylee/67691
，如需转载请自行联系原作者
