這篇文章主要介紹AspectCore Project怎么用,文中介紹的非常詳細,具有一定的參考價值,感興趣的小伙伴們一定要看完!
AspectCore Project 是適用于Asp.Net Core 平臺的輕量級 Aop(Aspect-oriented programming) 解決方案,它更好的遵循Asp.Net Core的模塊化開發理念,使用AspectCore可以更容易構建低耦合、易擴展的Web應用程序。AspectCore使用Emit實現高效的動態代理從而不依賴任何第三方Aop庫。
啟動 Visual Studio。從 File 菜單, 選擇 New > Project。選擇 ASP.NET Core Web Application 項目模版,創建新的 ASP.NET Core Web Application 項目。
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自定義特性類,它實現IInterceptor接口。AspectCore默認實現了基于Attribute的攔截器配置。我們的自定義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接口和它的實現類CustomService:
public interface ICustomService
{
[CustomInterceptor]
void Call();
}
public class CustomService : ICustomService
{
public void Call()
{
Console.WriteLine("service calling...");
}
}在HomeController中注入ICustomService:
public class HomeController : Controller
{
private readonly ICustomService _service;
public HomeController(ICustomService service)
{
_service = service;
}
public IActionResult Index()
{
_service.Call();
return View();
}
}注冊ICustomService,接著,在ConfigureServices中配置創建代理類型的容器:
public IServiceProvider ConfigureServices(IServiceCollection services)
{
services.AddTransient<ICustomService, CustomService>();
services.AddMvc();
services.AddAspectCore();
return services.BuildAspectCoreServiceProvider();
}攔截器配置。首先安裝AspectCore.Extensions.Configuration package:
PM> Install-Package AspectCore.Extensions.Configuration
全局攔截器。使用AddAspectCore(Action<AspectCoreOptions>)的重載方法,其中AspectCoreOptions提供InterceptorFactories注冊全局攔截器:
services.AddAspectCore(config =>
{
config.InterceptorFactories.AddTyped<CustomInterceptorAttribute>();
});帶構造器參數的全局攔截器,在CustomInterceptorAttribute中添加帶參數的構造器:
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");
}
}
}修改全局攔截器注冊:
services.AddAspectCore(config =>
{
config.InterceptorFactories.AddTyped<CustomInterceptorAttribute>(args: new object[] { "custom" });
});作為服務的全局攔截器。在ConfigureServices中添加:
services.AddTransient<CustomInterceptorAttribute>(provider => new CustomInterceptorAttribute("service"));修改全局攔截器注冊:
services.AddAspectCore(config =>
{
config.InterceptorFactories.AddServiced<CustomInterceptorAttribute>();
});作用于特定Service或Method的全局攔截器,下面的代碼演示了作用于帶有Service后綴的類的全局攔截器:
services.AddAspectCore(config =>
{
config.InterceptorFactories.AddTyped<CustomInterceptorAttribute>(method => method.DeclaringType.Name.EndsWith("Service"));
});使用通配符的特定全局攔截器:
services.AddAspectCore(config =>
{
config.InterceptorFactories.AddTyped<CustomInterceptorAttribute>(PredicateFactory.ForService("*Service"));
});在AspectCore中提供NonAspectAttribute來使得Service或Method不被代理:
[NonAspect]
public interface ICustomService
{
void Call();
}同時支持全局忽略配置,亦支持通配符:
services.AddAspectCore(config =>
{
//App1命名空間下的Service不會被代理
config.NonAspectOptions.AddNamespace("App1");
//最后一級為App1的命名空間下的Service不會被代理
config.NonAspectOptions.AddNamespace("*.App1");
//ICustomService接口不會被代理
config.NonAspectOptions.AddService("ICustomService");
//后綴為Service的接口和類不會被代理
config.NonAspectOptions.AddService("*Service");
//命名為Query的方法不會被代理
config.NonAspectOptions.AddMethod("Query");
//后綴為Query的方法不會被代理
config.NonAspectOptions.AddMethod("*Query");
});攔截器中的依賴注入。在攔截器中支持屬性注入,構造器注入和服務定位器模式。
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](區別于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);
}
}構造器注入需要使攔截器作為Service,除全局攔截器外,仍可使用ServiceInterceptor使攔截器從DI中激活:
public interface ICustomService
{
[ServiceInterceptor(typeof(CustomInterceptorAttribute))]
void Call();
}服務定位器模式。攔截器上下文AspectContext可以獲取當前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);
}
}使用Autofac和AspectCore。AspectCore原生支持集成Autofac,我們需要安裝下面兩個nuget packages:
PM> Install-Package Autofac.Extensions.DependencyInjection PM> Install-Package AspectCore.Extensions.Autofac
AspectCore提供RegisterAspectCore擴展方法在Autofac的Container中注冊動態代理需要的服務,并提供AsInterfacesProxy和AsClassProxy擴展方法啟用interface和class的代理。修改ConfigureServices方法為:
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());
}以上是“AspectCore Project怎么用”這篇文章的所有內容,感謝各位的閱讀!希望分享的內容對大家有幫助,更多相關知識,歡迎關注億速云行業資訊頻道!
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