Unity The Assembly Matching Rule
Unity的拦截策略中提供了程序集匹配规则,我们可以对于属于某个特定程序集的类型附加CallHandler。看一个简单的示例:
1 public class MyObject 2 { 3 public virtual void DoWork() 4 { 5 6 } 7 } 8 9 public class MyCallHandler : ICallHandler 10 { 11 #region ICallHandler Members 12 13 public IMethodReturn Invoke(IMethodInvocation input, GetNextHandlerDelegate getNext) 14 { 15 return getNext()(input, getNext); 16 } 17 18 public Int32 Order { get; set; } 19 20 #endregion 21 } 22 23 public class MyCallHandler2 : ICallHandler 24 { 25 #region ICallHandler Members 26 27 public IMethodReturn Invoke(IMethodInvocation input, GetNextHandlerDelegate getNext) 28 { 29 return getNext()(input, getNext); 30 } 31 32 public Int32 Order { get; set; } 33 34 #endregion 35 } 36 37 IUnityContainer unityContainer = new UnityContainer(); 38 39 unityContainer.LoadConfiguration(); 40 unityContainer.Configure<Interception>() 41 .AddPolicy(“AssemblyPolicy”) 42 .AddMatchingRule(new AssemblyMatchingRule(Assembly.GetEntryAssembly())) 43 .AddCallHandler<MyCallHandler>() 44 .AddCallHandler<MyCallHandler2>(); 45 46 unityContainer.RegisterType<MyObject>( 47 new Interceptor<VirtualMethodInterceptor>(), 48 new AdditionalInterface<INotifyPropertyChanged>(), 49 new InterceptionBehavior<PolicyInjectionBehavior>() 50 ); 51 52 MyObject myObject = unityContainer.Resolve<MyObject>(); 53 54 myObject.DoWork();
AssemblyMatchingRule的构造函数允许传递字符或者Assembly信息。上面的示例传递了当前AppDomain入口的EntryAssembly,MyObject类型属于这个Assembly中,所以MyCallHandler和MyCallHandler2在DoWork函数调用时都会被依次调用。同样上面的代码也可以通过配置文件定义:
<unity xmlns=”http://schemas.microsoft.com/practices/2010/unity”> <sectionExtension type=”Microsoft.Practices.Unity.InterceptionExtension.Configuration.InterceptionConfigurationExtension, Microsoft.Practices.Unity.Interception.Configuration” /> <assembly name=”mscorlib, 2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089″ /> <assembly name=”UnityTest6″ /> <namespace name=”System.ComponentModel” /> <namespace name=”UnityTest6″ /> <container> <extension type=”Interception” /> <interception> <policy name=”AssemblyPolicy”> <matchingRule name=”AssemblyMatchingRule” type=”AssemblyMatchingRule”> <constructor> <param name=”assemblyName” value=”UnityTest6″ /> </constructor> </matchingRule> <callHandler name=”MyCallHandler” type=”MyCallHandler” /> </policy> </interception> <register type=”MyObject”> <interceptor type=”VirtualMethodInterceptor” /> <addInterface type=”INotifyPropertyChanged” /> <interceptionBehavior type=”PolicyInjectionBehavior” /> </register> </container> </unity>