Setting ShowDistinctFilters for a RadGridViewColumn hides the distinct values from the filter popup as expected.

But the grid still queries the ItemsSource for distinct values of said column when showing thje popup - it calls something like

MyQueryable.Select(item => item.SomeColumn).Distinct().OrderBy(item => item).Take(1000))

Filtering the data by distinct value using the filter query optimization doesn't work properly when adding more than 500 distinct values. To reproduce this, set the OptimizeDistinctFilterQuery property of the corresponding column to True. The distinct values should be filtered using the ColumnFilterDescriptor and the AddDistinctValue method of the DistinctFilter.

In that case, the filter can get reversed and remove the selected distinct values from the data view, instead of adding only them, as would be expected. Or the filter can stop working at all and display all values from the ItemsSource.

To work this around, instead of using the ColumnFilterDescriptor and the AddDistinctValue method, add a composite filter descriptor manually in the FilterDescriptors of RadGridView.

radGridView.FilterDescriptors.SuspendNotifications();
var distinctValuesFilter = new CompositeFilterDescriptor();
distinctValuesFilter.LogicalOperator = FilterCompositionLogicalOperator.Or;
for (int i = 0; i < 5000; i++)
{
	object disctincValue = i;
	var filter = new FilterDescriptor("Id", FilterOperator.IsEqualTo, disctincValue);
	distinctValuesFilter.FilterDescriptors.Add(filter);                
}
radGridView.FilterDescriptors.Add(distinctValuesFilter);
radGridView.FilterDescriptors.ResumeNotifications();

The current row indicator visual (the right pointing arrow) gets hidden if you enter edit mode of a cell (which shows the cell edit indicator) and then press Esc two times. The first time cancel the cell editing and the second time cancels the row editing. 

This reproduces in the VisualStudio2013 theme.

To work this around, extract the ControlTemplate of GridViewRow for the VisualStudio2013 theme and add the following MultiTrigger at the bottom of the template (last in the ControlTemplate.Triggers collection).

<MultiTrigger>
	<MultiTrigger.Conditions>
		<Condition Property="IsValid" Value="True"/>
		<Condition Property="IsCurrent" Value="True"/>
		<Condition Property="IsInEditMode" Value="False"/>
	</MultiTrigger.Conditions>
	<Setter TargetName="NavigatorIndicator" Property="Visibility" Value="Visible"/>
</MultiTrigger>

The aggregate values shown in the group headers are wrong when scrolling. This happens when the EnableColumnVirtualization property is set to False and ColumnAggregatesAlignment is NextToGroupKey or BelowGroupKey.

To work this around, set the EnableColumnVirtualization property to True or ColumnAggregatesAlignment to NoAlignment. 

Currently, you can set the data format string of the cells in a GridView column by using the DataFormatString property of the column.

Add a mechanism to select the DataFormatString per cell. For example, this can be done using the CellStyleSelector and a new property in the GridViewCell. Or by introducing DataFormatStringSelector property.

"ArgumentException: Must specify valid information for parsing in the string."

The exception is handled internally but results in the filtering not being applied.

Hi Telerik,

I have created a sample project for an issue I have found:

Please see the code behind of the sample.

When removing a column from a grid where the display index was changed, and rows are selected, I do get an ArgumentOutOfRangeException. 

Any help is appreciated!

Thank you!

Thomas

Currently, when you click F2 or double mouse click in order to start editing a cell (with a TextBox editor) its text gets selected. This happens because the SelectAll() method of the underlying TextBox is called. Add a property that allows to disable this behavior and to avoid selecting the text.

At this point you can get this effect by creating a custom column and overriding its PrepareCellForEdit() method as shown here: https://docs.telerik.com/devtools/wpf/knowledge-base/kb-gridview-prevent-f2-text-selection