@GSerjo通IMethodInvocation input
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Practices.Unity;
using Microsoft.Practices.Unity.InterceptionExtension;
using NUnit.Framework;
namespace UnitTests
{
[TestFixture]
public class ForTest
{
[Test]
public void Test()
{
IUnityContainer container = new UnityContainer().AddNewExtension<Interception>();
container.RegisterType<IMyInterface, SpecificClass1>(
new Interceptor<InterfaceInterceptor>(),
new InterceptionBehavior<MyInterceptionBehavior>());
var myInterface = container.Resolve<IMyInterface>();
myInterface.SomeMethod();
}
}
public interface IMyInterface
{
void SomeMethod();
}
public class SpecificClass1 : IMyInterface
{
#region IMyInterface
public void SomeMethod()
{
Console.WriteLine("Method Called");
}
#endregion
}
public class MyInterceptionBehavior : IInterceptionBehavior
{
public bool WillExecute
{
get { return true; }
}
#region IInterceptionBehavior
public IEnumerable<Type> GetRequiredInterfaces()
{
return Enumerable.Empty<Type>();
}
public IMethodReturn Invoke(IMethodInvocation input, GetNextInterceptionBehaviorDelegate getNext)
{
IMethodReturn result = getNext()(input, getNext);
Console.WriteLine("Interception Called");
return result;
}
#endregion
}
}
控制台输出
Method Called
Interception Called
更多,概述了统一拦截的做法,效果很好。如果您想自动配置拦截,则可以使用UnityContainerExtension自动连接所有接口拦截以及行为。如果你想进入更具体的拦截(方法名称,签名,返回值等),那么你可能需要看看策略注入(使用与CallHandlers匹配的规则)。
因此,在这种情况下,容器延长会是什么样子:
public class UnityInterfaceInterceptionRegisterer : UnityContainerExtension
{
private List<Type> interfaces = new List<Type>();
private List<IInterceptionBehavior> behaviors =
new List<IInterceptionBehavior>();
public UnityInterfaceInterceptionRegisterer(Type interfaceType,
IInterceptionBehavior interceptionBehavior)
{
interfaces.Add(interfaceType);
behaviors.Add(interceptionBehavior);
}
public UnityInterfaceInterceptionRegisterer(Type[] interfaces,
IInterceptionBehavior[] interceptionBehaviors)
{
this.interfaces.AddRange(interfaces);
this.behaviors.AddRange(interceptionBehaviors);
ValidateInterfaces(this.interfaces);
}
protected override void Initialize()
{
base.Container.AddNewExtension<Interception>();
base.Context.Registering +=
new EventHandler<RegisterEventArgs>(this.OnRegister);
}
private void ValidateInterfaces(List<Type> interfaces)
{
interfaces.ForEach((i) =>
{
if (!i.IsInterface)
throw new ArgumentException("Only interface types may be configured for interface interceptors");
}
);
}
private bool ShouldIntercept(RegisterEventArgs e)
{
return e != null && e.TypeFrom != null &&
e.TypeFrom.IsInterface && interfaces.Contains(e.TypeFrom);
}
private void OnRegister(object sender, RegisterEventArgs e)
{
if (ShouldIntercept(e))
{
IUnityContainer container = sender as IUnityContainer;
var i = new Interceptor<InterfaceInterceptor>();
i.AddPolicies(e.TypeFrom, e.TypeTo, e.Name, Context.Policies);
behaviors.ForEach((b) =>
{
var ib = new InterceptionBehavior(b);
ib.AddPolicies(e.TypeFrom, e.TypeTo, e.Name, Context.Policies);
}
);
}
}
}
那么你可以使用它像这样:
IUnityContainer container = new UnityContainer()
.AddExtension(new UnityInterfaceInterceptionRegisterer(
new Type[] { typeof(IMyInterface),
typeof(IMyOtherInterface) },
new IInterceptionBehavior[] { new MyInterceptionBehavior(),
new AnotherInterceptionBehavior() }
));
container.RegisterType<IMyInterface, SpecificClass1>();
var myInterface = container.Resolve<IMyInterface>();
myInterface.SomeMethod();
现在,当这个接口已经注册了相应的拦截政策也将是添加到容器中。因此,在这种情况下,如果注册的接口类型为IMyInterface或IMyOtherInterface,则会为接口拦截设置策略,并且还会添加拦截行为MyInterceptionBehavior和AnotherInterceptionBehavior。
请注意,Unity 3(在此问题/答案后发布)添加了Registration by Convention功能,可以执行此扩展的功能(无需编写任何自定义代码)。来自Developer's Guide to Dependency Injection Using Unity的示例:
var container = new UnityContainer();
container.AddNewExtension<Interception>();
container.RegisterTypes(
AllClasses.FromLoadedAssemblies().Where(
t => t.Namespace == "OtherUnitySamples"),
WithMappings.MatchingInterface,
getInjectionMembers: t => new InjectionMember[]
{
new Interceptor<VirtualMethodInterceptor>(),
new InterceptionBehavior<LoggingInterceptionBehavior>()
});