Blazor Grid - Selection - Grid Selected Items Inicialization

[rjmoreno2022]

How would I initialize selected items from my Blazor Bootstrap Grid?

Grid:
<Grid @ref="gridSoporte"
TItem="InfoSoporte"
Class="table table-hover table-bordered table-striped"
Data="lSoporte"
AllowSorting = "true"
SelectionMode="GridSelectionMode.Multiple"
SelectedItemsChanged="OnSelectedItemsChanged"
SelectedItems="@selectedItemsInicial"
AllowSelection="true"
Responsive="true">

...

Method to try inicialization:

private async Task InicializarSeleccionados()
{
try
{
selectedItemsList = new List(); //This List has items
selectedItemsInicial = new HashSet();
if (lSoporte.Any())
{
selectedItemsList = lSoporte.FindAll(x => x.IsSelected).ToList();
selectedItemsList.ForEach(x => selectedItemsInicial.Add(x));
}
await gridSoporte.RefreshDataAsync();
StateHasChanged();
}
catch (Exception e)
{
await MessageSwalService.ShowMessageSwal(e.Message, MessageSwalService.TipoMensajeSwal.Danger);
}
}