ViewModelRegion.razor

@typeparam TViewModel
<CascadingValue TValue="TViewModel" Value="ViewModel">
    @ChildContent
</CascadingValue>

ViewModelRegion.razor.cs

using System;
using System.Collections.Specialized;
using System.ComponentModel;
using Microsoft.AspNetCore.Components;
using ThomasJaworski.ComponentModel;

// Using RecursiveChangeNotifier
// https://github.com/lostmsu/RecursiveChangeNotifier/

namespace WebStore.Shared
{
    public partial class ViewModelRegion<TViewModel> : ComponentBase
        where TViewModel : class, INotifyPropertyChanged
    {
        [Parameter]
        public RenderFragment? ChildContent { get; set; }

        [Parameter]
        public TViewModel? ViewModel
        {
            get => _viewModel;
            set
            {
                if (_changeListener != null)
                {
                    _changeListener.Dispose();
                    _changeListener = null;
                }
                _viewModel = value;
                if (_viewModel != null)
                {
                    _changeListener = ChangeListener.Create(value);
                    _changeListener.PropertyChanged += ViewModel_PropertyChanged;
                    _changeListener.CollectionChanged += ViewModel_CollectionChanged;
                }
            }
        }
        private TViewModel? _viewModel;
        private ChangeListener? _changeListener;

        private void ViewModel_PropertyChanged(object sender, PropertyChangedEventArgs e) => InvokeAsync(() => StateHasChanged()).ConfigureAwait(false);

        private void ViewModel_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e) => InvokeAsync(() => StateHasChanged()).ConfigureAwait(false);

        public void Dispose()
        {
            if (_changeListener != null)
            {
                _changeListener.Dispose();
            }
        }
    }
}