The Simplest Example

[HarryCordewener]

I feel I am missing something about the examples for the WebWorker, or something about what I am doing is wrong (which seems likely), and I would honestly love some help making use of the WebWorker.

    public interface IExcelService
    {
        public Task<IEnumerable<Change>> WebWorkAsync(IBrowserFile file);
    }

    public class ExcelService : IExcelService
    {
        public async Task<IEnumerable<Change>> WebWorkAsync(IBrowserFile file)
        {
            return new List<Change> { new Change("1", "2", "3")};
        }
   }
}

In an @code portion

        private async Task UploadFiles2(IBrowserFile file)
        {
            try
            {
                var webWorker = await WebWorkerService.GetWebWorker();
                var workerMathService = webWorker!.GetService<IExcelService>();
                var result = await workerMathService.WebWorkAsync(file);
                
                Dispatcher.Dispatch(new AddExcelListAction(result));
            }
            catch (Exception ex)
            {
                Console.WriteLine("Something went wrong: {message}", ex.Message);
            }
        }

When my debugger hits var result = await workerMathService.WebWorkAsync(file); it never returns with a result.
My debugger also never hits anything within WebWorkAsync(). And even if I put a simple Console.Writeline in the WebWorkAsync, nothing happens.

What am I missing? I believe I added everything that needs to be added to Program.cs.

...

builder.Services.AddBlazorJSRuntime();
builder.Services.AddWebWorkerService();
builder.Services.AddSingleton<IExcelService, ExcelService>();

...

await builder.Build().BlazorJSRunAsync();

Edit: Looks like I was missing error logs - which probable explains why this is going wrong:

ERROR:  MessageEvent {isTrusted: true, data: {…}, origin: '', lastEventId: '', source: null, …}
ERROR: Exception has been thrown by the target of an invocation.
ERROR stacktrace:    at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
   at SpawnDev.BlazorJS.IJSInProcessRuntimeExtensions.Invoke(IJSInProcessRuntime _js, Type returnType, String identifier, Object[] args)
   at SpawnDev.BlazorJS.JSInterop.Get(Type returnType, IJSInProcessObjectReference targetObject, Int32 identifier)
   at SpawnDev.BlazorJS.IJSInProcessObjectReferenceExtensions.Get(IJSInProcessObjectReference targetObject, Type returnType, Int32 identifier)
   at SpawnDev.BlazorJS.WebWorkers.ServiceCallDispatcher.PostDeserializeArgs(String requestId, MethodInfo methodInfo, Int32 argsLength, Func`3 getArg)
   at SpawnDev.BlazorJS.WebWorkers.ServiceCallDispatcher._worker_OnMessage(MessageEvent e)

[LostBeard]

Off hand I would guess that your IBrowserFile file parameter cannot be serialized or deserialized properly. Unfortunately I am out of gas for the night. I will take a closer look tomorrow. 👍

[HarryCordewener]

Aye, that looks to be exactly it. It wasn't throwing an exception, but instead hiding the error away in the Output window.

It's still confusing that it doesn't let the debugger hit the WebWorker service function - making it harder to debug. But I guess there's always logging statements to debug.