简单的注入器(SI)文档here展示了如何将SI与ASP.NET Core集成:
private void IntegrateSimpleInjector(IServiceCollection services) {
container.Options.DefaultScopedLifestyle = new AsyncScopedLifestyle();
services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
services.AddSingleton<IControllerActivator>(
new SimpleInjectorControllerActivator(container));
services.AddSingleton<IViewComponentActivator>(
new SimpleInjectorViewComponentActivator(container));
services.EnableSimpleInjectorCrossWiring(container);
services.UseSimpleInjectorAspNetRequestScoping(container);
}
此示例代码显示了如何将SI与我们在Razor Pages之前使用的控制器和ViewComponents(MVC模型)集成。
但是,这并没有将SI集成到Razor Pages中,这是ASP.NET Core 2.0发布的新功能。这基本上是一个MVVM模型(不完全是)。
所以Razor页面每个视图都有一个PageModel
,它就像控制器一样。我想使用SI注入这个类的构造函数。
我想到了一种使用Simple Injector注入PageModel
的构造函数的方法:
public class SimpleInjectorPageModelActivatorProvider : IPageModelActivatorProvider
{
private Container Container { get; }
public SimpleInjectorPageModelActivatorProvider(Container c) => Container = c;
public Func<PageContext, object> CreateActivator(CompiledPageActionDescriptor d) =>
_ => Container.GetInstance(d.ModelTypeInfo.AsType());
public Action<PageContext, object> CreateReleaser(CompiledPageActionDescriptor d) =>
null;
}
然后,只需添加这个新的单例注册:
private void IntegrateSimpleInjector(IServiceCollection services)
{
container.Options.DefaultScopedLifestyle = new AsyncScopedLifestyle();
services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
services.AddSingleton<IControllerActivator>(
new SimpleInjectorControllerActivator(container));
services.AddSingleton<IViewComponentActivator>(
new SimpleInjectorViewComponentActivator(container));
// Enables Injection into PageModel
services.AddSingleton<IPageModelActivatorProvider>(
new SimpleInjectorPageModelActivatorProvider(container));
services.EnableSimpleInjectorCrossWiring(container);
services.UseSimpleInjectorAspNetRequestScoping(container);
}
它的作用,基本上是在创建PageModel时调用Container.GetInstance(instanceType)
。
Simple Injector提供了一种使用扩展方法AddPageModelActivation实现此目的的简单方法。
services.AddSimpleInjector(container, options =>
{
// AddAspNetCore() wraps web requests in a Simple Injector scope.
options.AddAspNetCore()
// Ensure activation of a specific framework type to be created by
// Simple Injector instead of the built-in configuration system.
.AddControllerActivation()
.AddViewComponentActivation()
.AddPageModelActivation()
.AddTagHelperActivation();
});
要看整个例子https://simpleinjector.readthedocs.io/en/latest/aspnetintegration.html