c# - 简单注入(inject)器注入(inject) PageModel ASP.NET Core Razor 页面

Question

简单注入(inject)器 (SI) 文档 here显示如何将 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);
}

此示例代码展示了如何将 SI 与我们在 Razor PagesMVC 模型)集成>.

但是，这并没有将 SI 集成到 Razor Pages 中，这是随 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 页面的每个 View 都有一个 PageModel，它就像 Controller 一样。我想使用 SI 注入(inject)到此类的构造函数中。

Answer 1

我想出了一种使用简单注入(inject)器注入(inject) PageModel 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)。