@page "/" @if (MyList != null && MyList.Count > 0) { @foreach (var item in MyList) { <li>@item</li> } } @using System; @using System.Collections.Generic; @using System.Linq; @using System.Threading; @using System.Threading.Tasks; @code { static int counter; private Dictionary<Guid, List<string>> MyList { get; set; } private Timer Timer { get; set; } // A simple lock to make sure that multiple refreshes don't overlap private bool _isRefreshing; protected override async Task OnInitializedAsync() { await UpdateMyList(); // the initial loading of the list await base.OnInitializedAsync(); Timer = new Timer(async _ => { await RefreshList(); }, null, 0, 100); } private async Task UpdateMyList() { _isRefreshing = true; MyList = await ServiceGetItemsMock(); // external service to get list contents _isRefreshing = false; } private async Task RefreshList() { if (!_isRefreshing) { await UpdateMyList(); await InvokeAsync(StateHasChanged); } } private async Task<Dictionary<Guid, List<string>>> ServiceGetItemsMock() { await Task.Delay(1000); Dictionary<Guid, List<string>> dictionary = new Dictionary<Guid, List<string>>(); for (int i = 0; i < counter+2; i++) { List<string> list = new List<string>(); for (int x = 0; x < 10; x++) { list.Add($"item - {x}"); } dictionary.Add(Guid.NewGuid(), list); } counter++; return dictionary; } }