Async FetchChildAsync locks up Blazor wasm app

[rockfordlhotka]

As per MarimerLLC/cslaforum#922

Calling DataPortal.FetchAsync<ValueEdit>() on this class locks the app.

using Csla;
using System;
using System.Net.Http;
using System.Threading.Tasks;

namespace BlazorApp1.Client
{
    [Serializable]
    public class ValueEdit : BusinessBase<ValueEdit>
    {
        public static readonly PropertyInfo<string> ValueProperty = RegisterProperty<string>(nameof(Value));
        public string Value
        {
            get => GetProperty(ValueProperty);
            set => SetProperty(ValueProperty, value);
        }

        public static readonly PropertyInfo<ValueEdit> ChildProperty = RegisterProperty<ValueEdit>(nameof(Child));
        public ValueEdit Child
        {
            get => GetProperty(ChildProperty);
            set => SetProperty(ChildProperty, value);
        }

        [Fetch]
        [FetchChild]
        private async Task FetchAsync([Inject] HttpClient httpClient)
        {
            var response = await httpClient.GetAsync("/api/value");
            var value = await response.Content.ReadAsStringAsync();
            using (BypassPropertyChecks)
            {
                Value = value;
                Child = await DataPortal.FetchChildAsync<ValueEdit>();
            }
        }
    }
}

[rockfordlhotka]

Yeah... 😳😳😳

I had an infinite loop bug in my test code - each time it fetched a child, it fetched that child's child!

So the data portal and everything works as expected - the "bug" was sitting at the keyboard.

Working code:

using Csla;
using System;
using System.Net.Http;
using System.Threading.Tasks;

namespace BlazorApp1.Client
{
    [Serializable]
    public class ValueEdit : BusinessBase<ValueEdit>
    {
        public static readonly PropertyInfo<string> ValueProperty = RegisterProperty<string>(nameof(Value));
        public string Value
        {
            get => GetProperty(ValueProperty);
            set => SetProperty(ValueProperty, value);
        }

        public static readonly PropertyInfo<ValueEdit> ChildProperty = RegisterProperty<ValueEdit>(nameof(Child));
        public ValueEdit Child
        {
            get => GetProperty(ChildProperty);
            set => SetProperty(ChildProperty, value);
        }

        [Fetch]
        [FetchChild]
        private async Task FetchAsync(string name, [Inject] HttpClient httpClient)
        {
            Console.WriteLine($"entering {nameof(FetchAsync)}-{name}");
            var response = await httpClient.GetAsync("/api/value");
            var value = await response.Content.ReadAsStringAsync();
            Console.WriteLine($"after readstring {nameof(FetchAsync)}-{name}");
            using (BypassPropertyChecks)
            {
                Value = value;
                if (name != "child")
                    Child = await DataPortal.FetchChildAsync<ValueEdit>("child");
            }
            Console.WriteLine($"exiting {nameof(FetchAsync)}-{name}");
        }
    }
}

[github-actions]

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