SessionAs<AppUserSession>() throws exception when a service is called from a razor view

#1

I have a service:

public class CustomerService : Service
    {
        public ICustomerRepository Repository { get; set; }
       
        public Customer Get(GetCustomer request)
        {
            var currentUser = SessionAs<AppUserSession>();

            return Repository.GetCustomer(request.CustomerID, currentUser.UserID);
        }
}

A razor view:

@inherits ViewPage<MessageInfo>
@{
    ViewBag.Title = "Contracts";
    Layout = "~/Views/Shared/SignedInLayout.cshtml";
}

@{
    var requestObject = new GetCustomer { CustomerID = 1 };
    var customerService = TryResolve<CustomerService>();
    var customer = customerService.Get(requestObject);
}
....

But, the line var currentUser = SessionAs<AppUserSession>(); throws the following exception “This AppHost does not support accessing the current Request via a Singleton at ServiceStack.HostContext.GetCurrentRequest()”. This started happening after we moved to SS version 6.2.

#2

Can you include the full StackTrace please.

Do you also get this Exception when accessing the Session from IRequest directly, e.g:

var currentUser = Request.SessionAs<AppUserSession>();
#3

Response Status

Error Code NotImplementedException

Message This AppHost does not support accessing the current Request via a Singleton

Stack Trace

[GetContracts: 2/15/23 10:18:39 AM]: [REQUEST: {}] System.NotImplementedException: This AppHost does not support accessing the current Request via a Singleton at ServiceStack.HostContext.GetCurrentRequest() in /home/runner/work/ServiceStack/ServiceStack/ServiceStack/src/ServiceStack/HostContext.cs:line 320 at ServiceStack.SessionFeature.GetOrCreateSession[T](ICacheClient cache, IRequest httpReq, IResponse httpRes) in /home/runner/work/ServiceStack/ServiceStack/ServiceStack/src/ServiceStack/SessionFeature.cs:line 75 at ServiceStack.Service.SessionAsTUserSession in /home/runner/work/ServiceStack/ServiceStack/ServiceStack/src/ServiceStack/Service.cs:line 146 at MyProject.ServiceInterface.CustomerService.Get(GetCustomer request) in X:\ProjectFolder\MyProject\MyProject.ServiceInterface\CustomerService.cs:line 12x at ASP.Views.Contract.__contractlist.Execute() in c:\X:\ProjectFolder\MyProject\MyProject.Web\wwwroot\Views\Contract\contractlist.cshtml:line 17x at ServiceStack.Razor.ViewPage1.WriteTo(StreamWriter writer) in /home/runner/work/ServiceStack/ServiceStack/ServiceStack/src/ServiceStack.Razor/ViewPage.cs:line 86 at ServiceStack.Razor.Managers.RazorPageResolver.ExecuteRazorPageWithLayout(RazorPage razorPage, IRequest httpReq, IResponse httpRes, Object model, IRazorView pageInstance, Func1 layout) in /home/runner/work/ServiceStack/ServiceStack/ServiceStack/src/ServiceStack.Razor/Managers/RazorPageResolver.cs:line 208 at ServiceStack.Razor.Managers.RazorPageResolver.ExecuteRazorPage(IRequest httpReq, Stream outputStream, Object model, RazorPage razorPage) in /home/runner/work/ServiceStack/ServiceStack/ServiceStack/src/ServiceStack.Razor/Managers/RazorPageResolver.cs:line 165 at ServiceStack.Razor.Managers.RazorPageResolver.ProcessRequestAsync(IRequest httpReq, Object dto, Stream outputStream) in /home/runner/work/ServiceStack/ServiceStack/ServiceStack/src/ServiceStack.Razor/Managers/RazorPageResolver.cs:line 116 at ServiceStack.Formats.HtmlFormat.d__22.MoveNext() in /home/runner/work/ServiceStack/ServiceStack/ServiceStack/src/ServiceStack/Formats/HtmlFormat.cs:line 82

Errors

#4

The “Request” object is null so var currentUser = Request.SessionAs<AppUserSession>(); throws an exception.

#5

FYI to access service you need to use ResolveService<T>() and you should be disposing services after usage so this should at least be:

using var customerService = ResolveService<CustomerService>();
var customer = customerService.Get(requestObject);

But the recommended way to call services is to use the Service Gateway:

var customer = Gateway.Send(new GetCustomer { CustomerID = 1 });
#6

Thanks!

ResolveService<CustomerService>(); works.

I will change the code to Gateway.Send(new GetCustomer { CustomerID = 1 }); per your suggestion.

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