Error with .NET Core 2.1 and Razor Pages

[scearces]

My configuration: localhost, Windows 10, Visual Studio 2017, ASP.NET Core 2.1, Razor Pages. The WebEssentials.AspNetCore.PWA package injects 2 lines into _Layout.cshtml. The first line, in the head, should be link rel="manifest" href="/manifest.webmanifest" /. Instead, in my configuration it generates link rel="manifest" href=" ~ /manifest.webmanifest" /. See the extra tilde . This causes chrome to fail to locate the manifest.webmanifest. The second line it injects, in html region, should be script nws-csp-add-nonce='true'>'serviceWorker' in navigator && navigator.serviceWorker.register('/serviceworker') /script. Instead it is injecting script nws-csp-add-nonce='true' 'serviceWorker'in navigator&&navigator.serviceWorker.register('~/serviceworker') /script>. Again, see the tilde. This cause the service worker registration to fail be cause Chrome can't locate it. My question is what do I need to do to make it generate the code correctly? Is it because I am using .NET Core 2.1 instead of .NET Core 2.0 or is there something else I need to change? Thanks.

[bpepe]

Same problem here. I believe the 'Update Constants.cs #29' commit is the issue.

[under3415]

Going back to 1.0.33 fixed the issue, it's working again!

[HaraldMuehlhoffCC]

Same problem here. Going back to 1.0.33 fixed the issue for me also.

[jpisano]

I know it's not ideal but if you disable registering both the service worker and manifest:

services.AddProgressiveWebApp(new PwaOptions
{
	RegisterServiceWorker = false,
	RegisterWebmanifest = false,
	OfflineRoute = "offline"
});

You can then manually add both back to your layout:

<meta name="theme-color" content="#FFFFFF" />
<link rel="manifest" href="/manifest.webmanifest" />

and

<script>'serviceWorker' in navigator && navigator.serviceWorker.register('/serviceworker')</script>

[TanmaySM]

Facing same issue. Using other way around by setting RegisterServiceWorker and RegisterWebmanifest to false and adding both file manually as mentioned by @jpisano

[JudahGabriel]

@madskristensen It appears the latest WebEssentials.AspNetCore.SPA NuGet package doesn't work with .NET Core 2.1 because of the tilde, as described in the first post in this thread.

[acr21]

Having the same issue.

[braegelno5]

the last nuget package Version=1.0.42.0 has also again this error the master branch source are
public const string ServiceworkerRoute = "/serviceworker";
the reflected one is "~/serviceworker" with dll Version=1.0.42.0

[rahulsjoshi]

Same issue with .NET Core 2.1

[justechvn]

Thanks!

[Ghosts]

I was wondering if anyone has the status on this issue? Found a couple potential workarounds but if there's a plan to push a NuGet update for a fix I'd be fine waiting for that.

Thanks for any update.

[scearces]

Thanks for keeping me in the loop. I’d be interested in the workarounds and any info on a possible NuGet update. From: Caden Sumner <notifications@github.com> Sent: Wednesday, February 6, 2019 2:47 PM To: madskristensen/WebEssentials.AspNetCore.ServiceWorker <WebEssentials.AspNetCore.ServiceWorker@noreply.github.com> Cc: scearces <stevenscearce@hotmail.com>; Author <author@noreply.github.com> Subject: Re: [madskristensen/WebEssentials.AspNetCore.ServiceWorker] Error with .NET Core 2.1 and Razor Pages (#36) I was wondering if anyone has the status on this issue? Found a couple potential workarounds but if there's a plan to push a NuGet update for fix I'd be fine waiting for that. Thanks for any update. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub<#36 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AnKx1YqxEv64gTOTqH_v5tZK8kx5j3Akks5vKzE2gaJpZM4VJoHH>.

[GetTaxSolutions]

May be is a similar issue and that is the reason to ask here.
I have follow code which is using RazorViewEngine to return compiled string when apply the model:

using (var output = new StringWriter())
            {
                var viewContext = new ViewContext(
                    actionContext,
                    view,
                    new ViewDataDictionary<TModel>(
                        metadataProvider: new EmptyModelMetadataProvider(),
                        modelState: new ModelStateDictionary())
                    {
                        Model = model
                    },
                    new TempDataDictionary(
                        actionContext.HttpContext,
                        _tempDataProvider),
                    output,
                    new HtmlHelperOptions());

                await view.RenderAsync(viewContext);

                return output.ToString();
            }

All parameters are correct and it is working perfect when services.AddProgressiveWebApp() is not applied. But when you add it:

Unhandled Exception: System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.) ---> System.NullReferenceException: Object reference not set to an instance of an object.
at WebEssentials.AspNetCore.Pwa.ServiceWorkerTagHelperComponent.Process(TagHelperContext context, TagHelperOutput output)
at Microsoft.AspNetCore.Razor.TagHelpers.TagHelperComponent.ProcessAsync(TagHelperContext context, TagHelperOutput output)
at Microsoft.AspNetCore.Mvc.Razor.TagHelpers.TagHelperComponentTagHelper.ProcessAsync(TagHelperContext context, TagHelperOutput output)
at Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperRunner.RunAsync(TagHelperExecutionContext executionContext)
at AspNetCore._Views__EmailLayout.ExecuteAsync()
at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context)
at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, Boolean invokeViewStarts)
at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderLayoutAsync(ViewContext context, ViewBufferTextWriter bodyWriter)
at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context)
at Mvc.RenderViewToString.RazorViewToStringRenderer.RenderViewToStringAsync[TModel](String viewName, TModel model) in D:\Projects\TFS\GetTaxSolutions\Tools\MailKit Client\SendMailKit\TazorToString\RazorViewToStringRenderer.cs:line 58
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at Mvc.RenderViewToString.Program.Main() in D:\Projects\TFS\GetTaxSolutions\Tools\MailKit Client\SendMailKit\TazorToString\Program.cs:line 24
Press any key to continue . . .

I tried to apply PWA options to:

            RegisterServiceWorker = false,
            RegisterWebmanifest = false,

It's working but is not good solution for me. Is there some better solution to resolve this issue? Are you planning to fix it in next version?

AspNetCore version: 2.2
Pwa: 1.0.49
Thanks