/// <summary>
/// Evaluates the current filters and applies the filtering to the collection view of the items control.
/// </summary>
private void EvaluateFilter()
{
_deferFilterEvaluationTimer?.Stop();
var collectionView = DataGrid.Items;
// Collect all active filters of all known columns.
var filteredColumns = GetFilteredColumns();
if (Filtering != null)
{
// Notify client about additional columns being filtered.
var newColumns = filteredColumns
.Except(_filteredColumns)
.ToArray();
if (newColumns.Length > 0)
{
var columns = newColumns.ExceptNullItems().ToList().AsReadOnly();
var args = new DataGridFilteringEventArgs(columns);
Filtering(DataGrid, args);
if (args.Cancel)
{
return;
}
}
_filteredColumns = filteredColumns;
}
FilterChanged?.Invoke(this, EventArgs.Empty);
try
{
// Apply filter to collection view
collectionView.Filter = CreatePredicate(filteredColumns);
// Notify all filters about the change of the collection view.
foreach (var control in FilterColumnControls)
{
control?.ValuesUpdated();
}
var selectedItem = DataGrid.SelectedItem;
if (selectedItem != null)
{
DataGrid.Dispatcher.BeginInvoke(DispatcherPriority.Background, (Action)(() => DataGrid.ScrollIntoView(selectedItem)));
}
}
catch (InvalidOperationException)
{
// InvalidOperation Exception: "'Filter' is not allowed during an AddNew or EditItem transaction."
// Grid seems to be still in editing mode, even though we have called DataGrid.CommitEdit().
// Found no way to fix this by code, but after changing the filter another time by typing text it's OK again!
// Very strange!
}
}
/// <summary>
/// Evaluates the current filters and applies the filtering to the collection view of the items control.
/// </summary>
private void EvaluateFilter()
{
_deferFilterEvaluationTimer?.Stop();
var collectionView = _dataGrid.Items;
// Collect all active filters of all known columns.
var columnFilters = GetColumnFilters();
if (Filtering != null)
{
// Notify client about additional columns being filtered.
var columns = columnFilters
.Select(filter => filter.Column)
.Where(column => column != null)
.ToArray();
var newColumns = columns
.Except(_filteredColumns)
.ToArray();
if (newColumns.Length > 0)
{
var args = new DataGridFilteringEventArgs(newColumns);
Filtering(_dataGrid, args);
if (args.Cancel)
{
return;
}
}
_filteredColumns = columns;
}
FilterChanged?.Invoke(this, EventArgs.Empty);
try
{
// Apply filter to collection view
collectionView.Filter = CreatePredicate(columnFilters);
// Notify all filters about the change of the collection view.
foreach (var control in _filterColumnControls)
{
control.ValuesUpdated();
}
}
catch (InvalidOperationException)
{
// InvalidOperation Exception: "'Filter' is not allowed during an AddNew or EditItem transaction."
// Grid seems to be still in editing mode, even though we have called DataGrid.CommitEdit().
// Found no way to fix this by code, but after changing the filter another time by typing text it's OK again!
// Very strange!
}
}
/// <summary>
/// Evaluates the current filters and applies the filtering to the collection view of the items control.
/// </summary>
private void EvaluateFilter()
{
if (_deferFilterEvaluationTimer != null)
{
_deferFilterEvaluationTimer.Stop();
}
var collectionView = _dataGrid.Items;
// Collect all active filters of all known columns.
var filters = _filterColumnControls.Where(column => column.IsVisible && column.IsFiltered).ToArray();
if (Filtering != null)
{
// Notify client about additional columns being filtered.
var columns = filters.Select(filter => filter.Column).Where(column => column != null).ToArray();
var newColumns = columns.Except(_filteredColumns).ToArray();
if (newColumns.Length > 0)
{
var args = new DataGridFilteringEventArgs(newColumns);
Filtering(_dataGrid, args);
if (args.Cancel)
{
return;
}
}
_filteredColumns = columns;
}
if (FilterChanged != null)
{
FilterChanged(this, EventArgs.Empty);
}
try
{
// Apply filter to collection view
if (!filters.Any())
{
collectionView.Filter = _globalFilter;
}
else if (_globalFilter == null)
{
collectionView.Filter = item => filters.All(filter => filter.Matches(item));
}
else
{
collectionView.Filter = item => _globalFilter(item) && filters.All(filter => filter.Matches(item));
}
// Notify all filters about the change of the collection view.
_filterColumnControls.ForEach(filter => filter.ValuesUpdated());
}
catch (InvalidOperationException)
{
// InvalidOperation Exception: "'Filter' is not allowed during an AddNew or EditItem transaction."
// Grid seems to be still in editing mode, even though we have called DataGrid.CommitEdit().
// Found no way to fix this by code, but after changing the filter another time by typing text it's OK again!
// Very strange!
}
}
