如何从 _Layout.cshtml 访问 HttpContext

Question

Project: ASP.NET Core 7 MVC web application

I've added an object to the HttpContext.Items collection from within a controller and I am trying to access the object to hide some menu options in the _Layout.cshtml , but I am getting an error

Object reference required

How do I set the reference?

@if (HttpContext.Items["CurrentUser"] == null) { }

Answer 1

It seems that you are calling HttpContext as static like:

you could get the instance of HttpContext in View as below:

this.ViewContext.HttpContext

althougth you could get the httpcontext,It would also not work for your requirement.

You'd better try with ViewData/ViewBag

In Controller:

ViewData["Key"]=somevalue

In View:

@if(ViewData["Key"]==null){....}

Answer 2

Access the RazorPage Context property:

@if (Context.Items["CurrentUser"] == null) { }

Answer 3

I injected the reference @inject Microsoft.AspNetCore.Http.IHttpContextAccessor HttpContextAccessor