private async Task <IEnumerable <TItem> > GetDataAsync(string?key = null)
{
if (DataProvider is null)
{
return(new TItem[0]);
}
try
{
BlockOverlayService.Show();
var request = new DataRequest <TItem>
{
Skip = 0,
ForceUpdate = false,
// if load on demand and item key is given then only fetch immediate child items
SearchText = LoadOnDemand ? key ?? string.Empty : null
};
// perform query data
var response = await DataProvider
.GetDataAsync(request, CancellationToken.None)
.ConfigureAwait(true);
// allow calling application to filter/add items etc
var items = new List <TItem>(response.Items);
await ItemsLoaded.InvokeAsync(items).ConfigureAwait(true);
return(items);
}
finally
{
BlockOverlayService.Hide();
}
}
/// <summary>
/// Requests data from the data provider using the current settings.
/// </summary>
/// <param name="searchText">Optional override for the search text.</param>
protected async Task GetDataAsync(string?searchText = null)
{
try
{
BlockOverlayService.Show();
//var sortColumn = Columns.SingleOrDefault(c => c.SortColumn);
var sortColumn = Columns.Find(x => x.Id == SortCriteria?.Key || x.Title == SortCriteria?.Key);
var request = new DataRequest <TItem>
{
Skip = 0,
ForceUpdate = false,
SortFieldExpression = sortColumn?.Field,
SortDirection = sortColumn?.SortDirection,
SearchText = searchText ?? SearchText
};
// paging
if (PageCriteria != null)
{
request.Take = (int)PageCriteria.PageSize;
request.Skip = (int)PageCriteria.PreviousItems;
}
// perform query data
var response = await DataProvider
.GetDataAsync(request, CancellationToken.None)
.ConfigureAwait(true);
// allow calling application to filter/add items etc
var items = new List <TItem>(response.Items);
ItemsLoaded?.Invoke(items); // must use an action here and not an EventCallaback as that leads to infinite loop and 100% CPU
ItemsToDisplay = items;
// update pager state
if (PageCriteria != null)
{
PageCriteria.TotalCount = (uint)(response.TotalCount ?? 0);
}
// clear selection
await ClearSelectionAsync().ConfigureAwait(true);
}
finally
{
BlockOverlayService.Hide();
}
}
