Question

我需要在服务类（而不是控制器）中调用视图组件。我的目标是将视图组件呈现为字符串，然后处理HtmlString。

我可以找到帮助在ActionContext可用的控制器中呈现视图组件，但我无法从控制器调用我的服务。有什么帮助吗？我很高兴使用Mock和默认依赖注入。

目前，我正在使用mvc 6 beta 2.这是我班级的代码

public class MyClass
{
    Microsoft.AspNet.Mvc.DefaultViewComponentHelper viewComponentHelper = null;
    Microsoft.AspNet.Mvc.Razor.RazorView razorView = null;

    public MyClass(IViewComponentSelector selector, IViewComponentInvokerFactory factory,
        IRazorPageFactory razorPageFactory, IRazorViewEngine razorViewEngine, IRazorPageActivator pageActivator,
        IViewStartProvider viewStartProvider)
    {
        viewComponentHelper = new DefaultViewComponentHelper(selector, factory);
        razorView = new RazorView(razorViewEngine, pageActivator, viewStartProvider, null, true);
    }

    public void MyAction
    {

        var view = new Mock<IView>().Object;    

        var actionContext = new ActionContext(new RouteContext(new DefaultHttpContext()), new ActionDescriptor());
        var viewData = new ViewDataDictionary(new EmptyModelMetadataProvider(), new ModelStateDictionary());
        var viewContext = new ViewContext(actionContext, view, viewData, TextWriter.Null);

        viewComponentHelper.Contextualize(viewContext);
        var result = viewComponentHelper.Invoke("MyView").ToString();
    }
}

我遇到了异常

   at Microsoft.Framework.DependencyInjection.ServiceProviderExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
   at Microsoft.AspNet.Mvc.DefaultViewComponentActivator.<>c__DisplayClass6.<CreateActivateInfo>b__7(ViewContext viewContext)
   at Microsoft.AspNet.Mvc.PropertyActivator`1.Activate(Object view, TContext context)
   at Microsoft.AspNet.Mvc.DefaultViewComponentActivator.Activate(Object viewComponent, ViewContext context)
   at Microsoft.AspNet.Mvc.DefaultViewComponentInvoker.CreateComponent(ViewContext context)
   at Microsoft.AspNet.Mvc.DefaultViewComponentInvoker.InvokeSyncCore(MethodInfo method, ViewContext context)
   at Microsoft.AspNet.Mvc.DefaultViewComponentInvoker.Invoke(ViewComponentContext context)
   at Microsoft.AspNet.Mvc.DefaultViewComponentHelper.InvokeCore(TextWriter writer, Type componentType, Object[] arguments)
   at Microsoft.AspNet.Mvc.DefaultViewComponentHelper.Invoke(Type componentType, Object[] args)
   at Microsoft.AspNet.Mvc.DefaultViewComponentHelper.Invoke(String name, Object[] args)

Answer 1

在启动文件的ConfigureServices部分中，您需要注册您的服务，即：

   public void ConfigureServices(IServiceCollection services)
   {
                // Add MVC services to the services container.
                //services.AddMvc();

                services.AddTransient...
    }

如何在Asp.net核心服务类中调用View组件？

1 个答案: