An unhandled exception occurred while processing the request.

InvalidOperationException: Unable to resolve service for type 'Microsoft.AspNetCore.Http.IHttpContextAccessor' while attempting to activate 'DInjectionProvider.WholeInjection'.

Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.CreateArgumentCallSites(Type serviceType, Type implementationType, CallSiteChain callSiteChain, ParameterInfo[] parameters, bool throwIfCallSiteNotFound)

As of .NET Core 2.1 there is an extension method that has been added to correctly register an IHttpContextAccessor as a singleton. See Add helper to register IHttpContextAccessor #947. Simply add as follows in your ConfigureServices() method:

services.AddHttpContextAccessor();

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