Filter Elements

• Sep 04, 2023
• 3 minutes to read

Filter Elements allows you to filter the GridControl / TreeListControl‘s data. Filter Elements are separate controls within your application that automatically retrieve available values, format settings, and other information from the bound control.

Using Filter Elements, you can build your own UI to filter control data. As an example, here is a UI that uses Filter Elements for a filtering panel displayed next to the GridControl:

Run Demo: Filtering UI

Create a Filter Element

1. Add a filter element (the FilterElement class descendants) to the markup.
2. Set the attached FilterElement.Context property to associate the filter element with the GridControl‘s filter context.
3. Specify the field name of the column you want to filter using the FilterElement.FieldName property.

The following code sample uses the CheckedListFilterElement to filter the GridControl‘s data by the City column values:

Xaml

<Window ...
        xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid"
        xmlns:dxfui="http://schemas.devexpress.com/winfx/2008/xaml/core/filteringui">
    <dxg:GridControl x:Name="grid" ... />
    <!-- ... -->
    <dxfui:CheckedListFilterElement Context="{Binding FilteringContext, ElementName=grid}" FieldName="City"/>
</Window>

The image below shows the result:

Filter Element Types

Run Demo: Filtering

Filter Element	Description
CheckBoxFilterElement	Allows a user to filter by boolean values. <dxfui:CheckBoxFilterElement FieldName="HasAttachment" />
RadioListFilterElement	Allows a user to select one filter value from a set. <dxfui:RadioListFilterElement FieldName="Doors" />
CheckedListFilterElement	Allows a user to select multiple filter values from a set. <dxfui:CheckedListFilterElement FieldName="TrademarkID" /> Use the SelectAllWhenFilterIsNull property to specify whether to select all filter values when the filter is null.
CheckedTreeListFilterElement	Allows a user to filter by hierarchical values. <dxfui:CheckedTreeListFilterElement FieldName="SalesDate" /> DateTimeFilterTreeType - Gets or sets the date-time filter tree type. ImplyEmptyStringLikeBlank - Gets or sets whether to imply that empty strings are blank. SelectAllWhenFilterIsNull - Gets or sets whether to select all filter values when the filter is null. ShowSearchPanel - Gets or sets whether to show the search panel. StringFilterTreeType - Gets or sets the string filter tree type.
PredefinedFiltersElement	Allows a user to apply a column’s Predefined Filters. Use the ColumnBase.PredefinedFilters property to specify predefined filters. <dxfui:PredefinedFiltersElement FieldName="MPGCity" />
FormatConditionFilterElement	Allows a user to apply a column’s Conditional Formatting Filters. Use the TableView.FormatConditions / TreeListView.FormatConditions property to define conditional formatting rules. <dxfui:FormatConditionFilterElement FieldName="UnitPrice"/>
RangeFilterElement	Allows a user to filter by numeric values. <dxfui:RangeFilterElement FieldName="Price" />
DateRangeFilterElement	Allows a user to specify a date interval. <dxfui:DateRangeFilterElement FieldName="SalesDate" />
CalendarFilterElement	Allows a user to filter by date values. <dxfui:CalendarFilterElement FieldName="SalesDate" />
DatePeriodsFilterElement	Allows a user to apply predefined date filters. <dxfui:DatePeriodsFilterElement FieldName="SalesDate" />
MultiFilterElement	Allows a user to choose filter conditions. <dxfui:MultiFilterElement FieldName="SalesDate" />
ExcelStyleFilterElement	Consists of two tabs. The first tab allows a user to apply filter conditions. The second tab provides an Excel-style checklist. <dxfui:ExcelStyleFilterElement FieldName="Employee" /> AllowedFilterTypes - Gets or sets the allowed tabs displayed within the Excel-style filter element. DefaultFilterType - Gets or sets the default tab (Rules or Values) displayed within the excel-style filter element. FilterRulesTemplate - Gets or sets the Rules tab template. FilterValuesTemplate - Gets or sets the Values tab template. QueryOperators - Allows you to customize operators in the Excel-style Filter Element.

Limitations

• In Virtual Sources and Server Mode, record counts are not displayed by default. To display record counts, handle the DataControlBase.CustomUniqueValues event. For Virtual Sources, you can alternatively handle the GetUniqueValues event.

• In Virtual Sources and Server Mode, the RangeFilterElement and DateRangeFilterElement are not supported.