我正在尝试实现一个InterceptAttribute,它应该拦截我添加属性的任何方法。我让它在WebAPI解决方案中工作,但是,我不能让它在MVC 5应用程序中工作。两个项目中的代码相同。以下代码是我创建的属性。
using Ninject;
using Ninject.Extensions.Interception;
using Ninject.Extensions.Interception.Attributes;
using Ninject.Extensions.Interception.Request;
namespace Questionnaire.Common.InterceptAttributes
{
public class InterceptCacheAttribute : InterceptAttribute
{
public double TimeOut { get; set; }
public override IInterceptor CreateInterceptor(IProxyRequest request)
{
var cacheInterceptor = request.Kernel.Get<CacheInterceptor>();
cacheInterceptor.TimeOut = TimeOut;
return cacheInterceptor;
}
}
}
CacheInterceptor代码如下:
using System;
using System.Text;
using Ninject;
using Ninject.Extensions.Interception;
using Ninject.Extensions.Interception.Request;
namespace Questionnaire.Common.Interceptors
{
public class CacheInterceptor : IInterceptor
{
[Inject]
public ICaching Cache { get; set; }
public double TimeOut { get; set; }
public void Intercept(IInvocation invocation)
{
var minutes = Cache.TimeOutMinutes;
if (Math.Abs(TimeOut - default(double)) > 0)
{
minutes = TimeOut;
}
invocation.ReturnValue = Cache.Get(GenerateCacheKey(invocation.Request), minutes, delegate
{
invocation.Proceed();
return invocation.ReturnValue;
});
}
private static string GenerateCacheKey(IProxyRequest request)
{
var sb = new StringBuilder(request.Method.Name).Append(".");
foreach (var argument in request.Arguments)
{
if (argument == null)
{
sb.Append("null");
}
else if (argument is string && argument.ToString().Length < 50)
{
sb.Append((string)argument);
}
else
{
sb.Append(argument.GetHashCode());
}
sb.Append(".");
}
sb.Remove(sb.Length - 1, 1);
return sb.ToString();
}
}
}
最后,我将该属性添加到以下方法中。
using System.Configuration;
using Questionnaire.Common.InterceptAttributes;
namespace Questionnaire.Common.Utility
{
public class ConfigurationUtilities
{
[InterceptCache(TimeOut = 1440)]
public virtual string GetEnvironmentConnectionString(string name)
{
var connectionStringSettings = ConfigurationManager.ConnectionStrings[name + "_" + HostEnvironment];
return connectionStringSettings != null ? connectionStringSettings.ConnectionString : null;
}
}
}
代码执行永远不会进入InterceptCacheAttribute类。我已将调试点放在该类中,并且CacheInterceptor类和调试点永远不会被命中。属性所在的方法执行得很好,但是,我希望它被截获并且没有发生。我在不同的项目中使用相同的代码。该项目是一个非常有效的WebAPI项目。这些方法被截获,一切都按照应有的方式运作。有人可以向我解释为什么我不能让它在MVC 5应用程序中工作?我将不胜感激。
回答BatteryBackupUnit的问题: 答案是我不能。以下是我的NinjectWebCommon.cs类。
[assembly: WebActivatorEx.PreApplicationStartMethod(typeof(Mayo.Questionnaire.App_Start.NinjectWebCommon), "Start")]
[assembly: WebActivatorEx.ApplicationShutdownMethodAttribute(typeof(Mayo.Questionnaire.App_Start.NinjectWebCommon), "Stop")]
namespace Questionnaire.App_Start
{
using System;
using System.Web;
using System.Web.Http;
using System.Linq;
using ApplicationExtensions;
using Microsoft.Web.Infrastructure.DynamicModuleHelper;
using Ninject;
using Ninject.Web.Common;
public static class NinjectWebCommon
{
private static readonly Bootstrapper bootstrapper = new Bootstrapper();
public static void Start()
{
DynamicModuleUtility.RegisterModule(typeof(OnePerRequestHttpModule));
DynamicModuleUtility.RegisterModule(typeof(NinjectHttpModule));
bootstrapper.Initialize(CreateKernel);
}
public static void Stop()
{
bootstrapper.ShutDown();
}
private static IKernel CreateKernel()
{
var kernel = new StandardKernel();
try
{
kernel.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel);
kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>();
GlobalConfiguration.Configuration.DependencyResolver = new NinjectDependencyResolver(kernel);
RegisterServices(kernel);
return kernel;
}
catch
{
kernel.Dispose();
throw;
}
}
private static void RegisterServices(IKernel kernel)
{
foreach (var module in from assembly in AppDomain.CurrentDomain.GetAssemblies()
select assembly.GetNinjectModules()
into modules
from module in modules
where !kernel.GetModules().Any(m => m.Name.Equals(module.Name))
select module)
{
kernel.Load(module);
}
}
}
}
在RegisterServices方法中,迭代应用程序中的每个程序集,并加载从NinjectModule继承的所有类。但是,我无法验证它是否正常工作,因为我无法调试它。我试过了,但是,在课堂上永远不会停止执行。我知道该类正在实例化,并且正在加载模块,因为我在那些工作的模块中有绑定,但是,我无法验证它。