blazor-lifetime/Pages/FirstLevelComponentAsync.razor.cs

using Microsoft.AspNetCore.Components;
using System;
using System.Threading.Tasks;

namespace blazor_lifetime.Pages
{
    public class FirstLevelComponentAsyncModel : ComponentBase
    {
        protected string AsyncParameter { get; set; }
        protected override async Task OnInitializedAsync()
        {
            Console.WriteLine($"{GetType().Name}.OnInitialized.Start");
            await Task.Delay(500); 
            AsyncParameter = "value 123";
            Console.WriteLine($"{GetType().Name}.OnInitialized.End");
        }

        protected override async Task OnParametersSetAsync()
        {
            Console.WriteLine($"{GetType().Name}.OnParametersSet.Start");
            await Task.Delay(500);
            Console.WriteLine($"{GetType().Name}.OnParametersSet.End");
        }

        protected override async Task OnAfterRenderAsync(bool firstRender)
        {
            if (firstRender)
            {
                Console.WriteLine($"{GetType().Name}.OnAfterRender(FirstRender).Start");
                await Task.Delay(500);
                Console.WriteLine($"{GetType().Name}.OnAfterRender(FirstRender).End");
            } else
            {
                Console.WriteLine($"{GetType().Name}.OnAfterRender.Start");
                await Task.Delay(500);
                Console.WriteLine($"{GetType().Name}.OnAfterRender.End");
            }
        }
    }
}