最近 Enterprise Library 6 正式版发布了，距离上了版本又有一段时间．首先我们来看下面这张模块图，实线表示强依赖，虚线表示弱依赖(或可选的)．
6.0版本全面支持.net Framework 4.5.
相对于前面5.0版本，移除了下面的模块：
The Caching Application Block
The Cryptography Application Block
The Security Application Block
对于Cache可以考虑试用.net framework基类库中的System.Runtime.Caching类，或是Windows Server AppFabric 缓存特性．
对于加密这一块，可参考.NET Framework Cryptography Model来代替．
安全模块可以采用Claims-based来代替，更加信息可参考MSDN.
参加两个新的模块:
- Transient Fault Handling Application Block
- Semantic Logging Application Block
变化：
这次有一项改动是那些模块的功能类不再自动从Unity创建了，也就是引导也不依赖Unity容器组件. 这是区别5.0版本的，现在应该删除下面代码:
AddNewExtension<EnterpriseLibraryCoreExtension>
例如，使用Logging Application block模块，那需要先使用静态方法注册一下:
//From Entlib 6 document:Exception Handling Application Block objects can no longer be created
// automatically from the Unity DI container.
IConfigurationSource configurationSource = ConfigurationSourceFactory.Create();
LogWriterFactory logWriterFactory = new LogWriterFactory(configurationSource);
Logger.SetLogWriter(logWriterFactory.Create());
否则可能出现这样的异常:
The LogWriter has not been set for the Logger static class. Set it invoking the Logger.SetLogWriter method.
基于6.0版本实现面向方向的编程AOP, 只需做少许修改即可．以前曾写过一篇文章基于Enterprise Library 4.1版本． 首选，在Nuget上下载相关Enterprise Library 6模块，参考下面的Nuget的XML文件：
<?xml version="1.0" encoding="utf-8"?>
<packages>
<package id="CommonServiceLocator" version="1.0" targetFramework="net45" />
<package id="EnterpriseLibrary.Common" version="6.0.1304.0" targetFramework="net45" />
<package id="EnterpriseLibrary.ExceptionHandling" version="6.0.1304.0" targetFramework="net45" />
<package id="EnterpriseLibrary.ExceptionHandling.Logging" version="6.0.1304.0" targetFramework="net45" />
<package id="EnterpriseLibrary.Logging" version="6.0.1304.0" targetFramework="net45" />
<package id="EnterpriseLibrary.PolicyInjection" version="6.0.1304.0" targetFramework="net45" />
<package id="EnterpriseLibrary.Validation" version="6.0.1304.0" targetFramework="net45" />
<package id="Unity" version="3.0.1304.0" targetFramework="net45" />
<package id="Unity.Interception" version="3.0.1304.0" targetFramework="net45" />
<package id="xunit" version="1.9.1" targetFramework="net45" />
</packages>
用一个ServiceFactory来解析Interface，其静态构造方法是这样的，这只是这个类的片断代码：
static ServiceFactory()
{
IUnityContainer container = new UnityContainer();
string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "EntLib.Config");
var map = new ExeConfigurationFileMap { ExeConfigFilename = path };
var config = ConfigurationManager.OpenMappedExeConfiguration(map, ConfigurationUserLevel.None);
try
{
var section = (UnityConfigurationSection)config.GetSection("unity");
section.Configure(container, "DefContainer");
//From Entlib 6 document:Exception Handling Application Block objects can no longer be created
// automatically from the Unity DI container.
IConfigurationSource configurationSource = ConfigurationSourceFactory.Create();
LogWriterFactory logWriterFactory = new LogWriterFactory(configurationSource);
Logger.SetLogWriter(logWriterFactory.Create());
ExceptionPolicyFactory exceptionPolicyFactory = new ExceptionPolicyFactory(configurationSource);
ExceptionPolicy.SetExceptionManager(exceptionPolicyFactory.CreateManager());
}
catch (InvalidOperationException ioe)
{
throw;
}
serviceLocator = new UnityServiceLocator(container);
}
上面的代码是从前面Assembly目录，加载一个EntLib.Config的XML配置文件，读取其中的Unity配置节与日志，异常处理的配置节．
下面以Demo个简单的Interface, 我们在Method加上相应横切的Attribute，分别用作 验证，日志，异常处理:
[ServiceContract]
public interface IService1
{
[ValidationCallHandler]
[LogCallHandler(BeforeMessage = "before GetData", AfterMessage = "after GetData",
IncludeCallStack = true)]
[ExceptionCallHandler("MyPolicy")]
[OperationContract]
string GetData([RangeValidator(1, RangeBoundaryType.Inclusive, 200, RangeBoundaryType.Inclusive)]
int value);
[OperationContract]
CompositeType GetDataUsingDataContract(CompositeType composite);
}
最后我们用基于xunit的UnitTest来验证一下, AOP拦截对方法参数的验证，之前Method限制了参数值的范围是1-200,第二个方法故意触发这个逻辑．
[Fact]
public void GetDataWithCuttingConcern()
{
//Arrange
var service = ServiceFactory.GetInstance<WcfService1.IService1>();
//Act
string result=service.GetData(100);
//Assert
Assert.NotNull(result);
}
[Fact]
public void GetDataShouldAriseValidationException()
{
//Arrange and act
var service = ServiceFactory.GetInstance<WcfService1.IService1>();
//Assert
Assert.Throws<ArgumentValidationException>(()=>service.GetData(300));
}
鉴于篇幅有限，基于XML的Enterprise Library配置文件不在这儿就贴了，请参考以前的文章，使用时可用EntLib 6 配置控制台更新一下配置文件．
希望对您软件开发有帮助．
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作者：Petter Liu
出处：http://www.cnblogs.com/wintersun/
本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。
该文章也同时发布在我的独立博客中-Petter Liu Blog。
