@if (this.servers != null && this.servers.Count > 0)
{
  <ul>
    <Virtualize Items="this.servers" Context="server">
      <ServerComponent server="server"></ServerComponent>
    </Virtualize>
  </ul>
}

@code {
  private List<Server>? servers;

  [Parameter]
  public string? CityName { get; set; }
  [Parameter]
  public string SearchFilter { get; set; } = "";

  protected override void OnParametersSet()
  {
    if (string.IsNullOrWhiteSpace(this.SearchFilter))
    {
      servers = ServersRepository.GetServersByCity(CityName ?? "Eindhoven");
    }
    else
    {
      servers = ServersRepository.SearchServers(SearchFilter);
    }
  }
}