我正在使用web api实现Policy injection,而对于DI,我们正在使用自定义DependancyResolver。我使用InterfaceIntercept方法来实现策略注入。它在Classes(自定义创建的类)的情况下工作正常,但在ApiController的情况下不会触发Policy Injection。
要使用APIController调用Policy Injection,我创建了一个接口&用控制器实现了这一点。分享以下代码: 此外,我还需要使用MessageHandler调用策略。
政策注入代码:
public class LogExceptionsCallHandler : ICallHandler
{
public IMethodReturn Invoke(IMethodInvocation input,
GetNextHandlerDelegate getNext)
{
IApplicationLogger logger = new ApplicationLogger();
logger.Log(LoggingLevel.TRACE, "Entering " + input.MethodBase.DeclaringType.FullName + "." + input.MethodBase.Name);
//// Perform the operation
var methodReturn = getNext().Invoke(input, getNext);
//// Method failed, go ahead
if (methodReturn.Exception != null)
return methodReturn;
//// If the result is negative, then throw an exception
logger.Log(LoggingLevel.TRACE, "Ending " + input.MethodBase.DeclaringType.FullName + "." + input.MethodBase.Name);
return methodReturn;
}
public int Order { get; set; }
}
属性代码
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Interface | AttributeTargets.Method)]
public class LogExceptionsAttribute : HandlerAttribute
{
public LogExceptionsAttribute()
{
}
public HandleLogging HandleLogging { get; set; }
public int RetryCount { get; set; }
public override ICallHandler CreateHandler(Microsoft.Practices.Unity.IUnityContainer container)
{
return new LogExceptionsCallHandler();
}
}
接口代码:此接口由ApiController实现
[LogExceptions]
public interface IRequestExecutionController : IHttpController
{
[LogExceptions]
HttpResponseMessage ExecuteRequest();
}
IRequestExecutionController接口由RequestExecutionController实现。 统一注册类型:
container.RegisterType<IDDNPublicAPI.PassThrough.IRequestExecutionController, RequestExecutionController>("requestexecution");
注册拦截
container.Configure<Interception>().SetInterceptorFor<IDDNPublicAPI.PassThrough.IRequestExecutionController>(new InterfaceInterceptor());
由于我们有统一来解决依赖关系,所以我们创建了一个控制器工厂类来处理Controller实例创建。
public class UnityControllerFactory : IHttpControllerActivator
{
private IUnityContainer container;
private readonly IControllerFactory innerFactory;
public UnityControllerFactory(IUnityContainer container)
: this(container, new DefaultControllerFactory())
{ }
public UnityControllerFactory(IUnityContainer container, IControllerFactory innerFactory)
{`enter code here`
this.container = container;
this.innerFactory = innerFactory;
}enter code here
public IHttpController Create(HttpRequestMessa`enter code here`ge request, HttpControllerDescriptor controllerDescriptor, Type controllerType)
{
var controller = (IHttpController)this.container.Resolve(controllerType, controllerDescriptor.ControllerName.ToLower());
return controller;
}
}
我们已在全局配置文件中注册此Controller工厂。相同的过程适用于其他类,但不适用于apicontroller。
任何人都可以对此提出一些建议吗?
答案 0 :(得分:0)
Web API控制器无法拦截。但是你可以使用过滤器获得相同的结果。
这是一篇很好的帖子,展示了如何使用过滤器在控制器中进行日志记录: http://damienbod.wordpress.com/2013/09/15/aop-with-asp-net-web-api/
您仍然可以使用日志记录拦截器记录任何后端代码。