RazorApp: SignalR throw exception once deploy (HubConnectionBuilder.Build())

[h3david]

Hi All,

I have been sttrugling for 2 days with this issue, saw a few similar post but none of them resolved my issue.

I have a component that build a signal HubConnection in order to receive messages like so:

protected override async Task OnInitializedAsync()
{

    var uri = NavigationManager.ToAbsoluteUri($"/broadcastHub");
    var connectionBuilder = new HubConnectionBuilder().WithUrl(uri);

    hubConnection = connectionBuilder.Build(); //Exception throw HERE!

    hubConnection.On("RefreshData", () => Refresh()); ;

    await hubConnection.StartAsync();
}

It works perfectly when I run in debug in Visual Studio, but once I deploy it on IIS (10) I get the following exception from the HubConnectionBuilder.Build() method:

Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
      Unhandled exception rendering component: A suitable constructor for type 'Microsoft.AspNetCore.Http.Connections.Client.HttpConnectionFactory' could not be located. Ensure the type is concrete and services are registered for all parameters of a public constructor.
System.InvalidOperationException: A suitable constructor for type 'Microsoft.AspNetCore.Http.Connections.Client.HttpConnectionFactory' could not be located. Ensure the type is concrete and services are registered for all parameters of a public constructor.
  at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.CreateConstructorCallSite (Microsoft.Extensions.DependencyInjection.ServiceLookup.ResultCache lifetime, System.Type serviceType, System.Type implementationType, Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteChain callSiteChain) <0x22470e8 + 0x00086> in <filename unknown>:0 
  at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.TryCreateExact (Microsoft.Extensions.DependencyInjection.ServiceDescriptor descriptor, System.Type serviceType, Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteChain callSiteChain, System.Int32 slot) <0x223da20 + 0x000f2> in <filename unknown>:0 
  at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.TryCreateExact (System.Type serviceType, Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteChain callSiteChain) <0x223d5d8 + 0x00034> in <filename unknown>:0 
  at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.CreateCallSite (System.Type serviceType, Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteChain callSiteChain) <0x223cf10 + 0x0005a> in <filename unknown>:0 
  at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory+<>c__DisplayClass7_0.<GetCallSite>b__0 (System.Type type) <0x223ca48 + 0x00010> in <filename unknown>:0 
  at System.Collections.Concurrent.ConcurrentDictionary`2[TKey,TValue].GetOrAdd (TKey key, System.Func`2[T,TResult] valueFactory) <0x21f9840 + 0x0006c> in <filename unknown>:0 
  at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.GetCallSite (System.Type serviceType, Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteChain callSiteChain) <0x21f96c8 + 0x00040> in <filename unknown>:0 
  at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.CreateServiceAccessor (System.Type serviceType) <0x21f9130 + 0x00018> in <filename unknown>:0 
  at System.Collections.Concurrent.ConcurrentDictionary`2[TKey,TValue].GetOrAdd (TKey key, System.Func`2[T,TResult] valueFactory) <0x21f89b8 + 0x0006c> in <filename unknown>:0 
  at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.GetService (System.Type serviceType, Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope serviceProviderEngineScope) <0x21f8778 + 0x00024> in <filename unknown>:0 
  at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.GetService (System.Type serviceType) <0x21f8360 + 0x0000c> in <filename unknown>:0 
  at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService (System.Type serviceType) <0x21f8210 + 0x0000e> in <filename unknown>:0 
  at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetService[T] (System.IServiceProvider provider) <0x290da50 + 0x00022> in <filename unknown>:0 
  at Microsoft.AspNetCore.SignalR.Client.HubConnectionBuilder.Build () <0x290d958 + 0x0002e> in <filename unknown>:0

I really hope someone can help me here, thanks.

David

Some details about my configuration:
My project is a Hosted Blazor server app created via visual studio 2019.

Here are the nugget packages for the Server:

• Microsoft.AspNetCore.Components.WebAssembly.Server 3.2.1
• Microsoft.AspNetCore.Http.Connections.Client 3.1.10
• Microsoft.Extensions.Http 3.1.10

Here are the nugget packages for the Client:

• Microsoft.AspNetCore.Components.WebAssembly 3.2.0
• Microsoft.AspNetCore.Components.WebAssembly.Build 3.2.0
• Microsoft.AspNetCore.Components.WebAssembly.DevServer 3.2.0
• Microsoft.AspNetCore.Http.Connections.Client 3.1.10
• Microsoft.AspNetCore.SignalR.Client3.1.10
• Microsoft.Extensions.Http 3.2.0

Also installed:

• .net Core SDK 3.1.404
• ASP.NET Core Runtime 3.1.10
• .NET Core Runtime 3.1.10

[BrennanConroy]

Try configuring the trimmer to see if it's being too aggressive https://docs.microsoft.com/en-us/aspnet/core/blazor/host-and-deploy/configure-trimmer?view=aspnetcore-5.0

Also, 3.2 is going to be out of support shortly, so it is recommended to update to 5.0. https://devblogs.microsoft.com/aspnet/blazor-webassembly-3-2-0-now-available/#lts-or-current

[h3david]

Hi Brennan,

Thanks for the reply.

For a reason I can't explain it started to work... I can't think of anything that could have fixed the issue.
I will take a look at the links you sent anyway, I might understand something out of it.
For sure I am planning on migrating to 5.0 as soon as my proof of concept is finished.