AspectCore Project 是適用於Asp.Net Core 平台的輕量級Aop(Aspect-oriented programming) 解決方案，它更好的遵循Asp.Net Core的模組化開發理念，使用AspectCore可以更容易建立低耦合、易擴展的Web應用程式。 AspectCore使用Emit實現高效率的動態代理程式從而不依賴任何第三方Aop函式庫。
啟動 Visual Studio。從 File 選單, 選擇 New > Project。選擇 ASP.NET Core Web Application 專案模版，建立新的 ASP.NET Core Web Application 專案。
從Nuget 安裝AspectCore.Extensions.DependencyInjection package:
PM> Install-Package AspectCore.Extensions.DependencyInjection
#在一般情況下可以使用抽象的InterceptorAttribute自訂特性類，它實作IInterceptor介面。 AspectCore預設實作了基於Attribute的攔截器配置。我們的自訂攔截器看起來像下面這樣:
public class CustomInterceptorAttribute : InterceptorAttribute
{
public async override Task Invoke(IAspectContext context, AspectDelegate next)
{
try
{
Console.WriteLine("Before service call");
await next(context);
}
catch (Exception)
{
Console.WriteLine("Service threw an exception!");
throw;
}
finally
{
Console.WriteLine("After service call");
}
}
}定義ICustomService介面和它的實作類別CustomService:
public interface ICustomService
{
[CustomInterceptor]
void Call();
}
public class CustomService : ICustomService
{
public void Call()
{
Console.WriteLine("service calling...");
}
}在HomeController中註入ICustomService:
public class HomeController : Controller
{
private readonly ICustomService _service;
public HomeController(ICustomService service)
{
_service = service;
}
public IActionResult Index()
{
_service.Call();
return View();
}
}註冊ICustomService，接著，在ConfigureServices中配置建立代理類型的容器:
public IServiceProvider ConfigureServices(IServiceCollection services)
{
services.AddTransient<ICustomService, CustomService>();
services.AddMvc();
services.AddAspectCore();
return services.BuildAspectCoreServiceProvider();
}AspectCore.Extensions.Configuration package：
PM> Install-Package AspectCore.Extensions.Configuration
AddAspectCore(Action的重載方法，其中AspectCoreOptions提供InterceptorFactories註冊全域攔截器:
services.AddAspectCore(config =>
{
config.InterceptorFactories.AddTyped<CustomInterceptorAttribute>();
});CustomInterceptorAttribute中加入參數的建構器：
public class CustomInterceptorAttribute : InterceptorAttribute
{
private readonly string _name;
public CustomInterceptorAttribute(string name)
{
_name = name;
}
public async override Task Invoke(AspectContext context, AspectDelegate next)
{
try
{
Console.WriteLine("Before service call");
await next(context);
}
catch (Exception)
{
Console.WriteLine("Service threw an exception!");
throw;
}
finally
{
Console.WriteLine("After service call");
}
}
}services.AddAspectCore(config =>
{
config.InterceptorFactories.AddTyped<CustomInterceptorAttribute>(args: new object[] { "custom" });
});ConfigureServices中新增：
services.AddTransient<CustomInterceptorAttribute>(provider => new CustomInterceptorAttribute("service"));services.AddAspectCore(config =>
{
config.InterceptorFactories.AddServiced<CustomInterceptorAttribute>();
});Service或Method的全域攔截器，下面的程式碼示範了作用於帶有Service後綴的類別的全域攔截器：
services.AddAspectCore(config =>
{
config.InterceptorFactories.AddTyped<CustomInterceptorAttribute>(method => method.DeclaringType.Name.EndsWith("Service"));
});services.AddAspectCore(config =>
{
config.InterceptorFactories.AddTyped<CustomInterceptorAttribute>(PredicateFactory.ForService("*Service"));
});NonAspectAttribute來使得Service或Method不被代理程式：
[NonAspect]
public interface ICustomService
{
void Call();
} services.AddAspectCore(config =>
{
//App1命名空间下的Service不会被代理
config.NonAspectOptions.AddNamespace("App1");
//最后一级为App1的命名空间下的Service不会被代理
config.NonAspectOptions.AddNamespace("*.App1");
//ICustomService接口不会被代理
config.NonAspectOptions.AddService("ICustomService");
//后缀为Service的接口和类不会被代理
config.NonAspectOptions.AddService("*Service");
//命名为Query的方法不会被代理
config.NonAspectOptions.AddMethod("Query");
//后缀为Query的方法不会被代理
config.NonAspectOptions.AddMethod("*Query");
});屬性注入，在攔截器中擁有
public get and set權限的屬性標記[AspectCore.Abstractions.FromServices](區別於Microsoft.AspNetCore.Mvc. FromServices)特性，即可自動注入該屬性，如：
public class CustomInterceptorAttribute : InterceptorAttribute
{
[AspectCore.Abstractions.FromServices]
public ILogger<CustomInterceptorAttribute> Logger { get; set; }
public override Task Invoke(AspectContext context, AspectDelegate next)
{
Logger.LogInformation("call interceptor");
return next(context);
}
}Service，除全域攔截器外，仍可使用ServiceInterceptor使攔截器從DI中啟動：
public interface ICustomService
{
[ServiceInterceptor(typeof(CustomInterceptorAttribute))]
void Call();
}AspectContext可以取得目前Scoped的ServiceProvider：
public class CustomInterceptorAttribute : InterceptorAttribute
{
public override Task Invoke(AspectContext context, AspectDelegate next)
{
var logger = context.ServiceProvider.GetService<ILogger<CustomInterceptorAttribute>>();
logger.LogInformation("call interceptor");
return next(context);
}
}和AspectCore。 AspectCore原生支援整合Autofac，我們需要安裝下面兩個nuget packages：<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">PM> Install-Package Autofac.Extensions.DependencyInjection
PM> Install-Package AspectCore.Extensions.Autofac</pre><div class="contentsignin">登入後複製</div></div>AspectCore提供
擴充方法在Autofac的Container中註冊動態代理程式所需的服務，並提供AsInterfacesProxy和AsClassProxy擴充方法啟用interface和class的代理程式。修改ConfigureServices方法為：<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">public IServiceProvider ConfigureServices(IServiceCollection services)
{
services.AddMvc();
var container = new ContainerBuilder();
container.RegisterAspectCore();
container.Populate(services);
container.RegisterType<CustomService>().As<ICustomService>().InstancePerDependency().AsInterfacesProxy();
return new AutofacServiceProvider(container.Build());
}</pre><div class="contentsignin">登入後複製</div></div>
最後。 。 。
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