wpf-6130-controls-and-libraries-data-grid-filtering-and-searching-filter-dropdown-regular-and-checked-drop-down-filters.md
A regular drop-down filter allows end users to select one item at a time. To use this filter for a column, set the column’s ColumnBase.FilterPopupMode property to List.
A checked drop-down filter allows end users to select several items simultaneously. To use this filter for a column, set the column’s ColumnBase.FilterPopupMode property to CheckedList.
The following table summarizes the differences between regular and checked drop-down filters:
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Feature
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Regular Drop-down Filter
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Checked Drop-down Filter
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Selection
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One item at a time can be selected.
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Multiple items can be selected simultaneously.
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Clear filter
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Click the (All) item. This cancels the current column’s filters.
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Click the (Select All) item.
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MRU items (most recently used items)
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Yes
Use the DataControlBase.AllowColumnMRUFilterList property to show/hide MRU items.
Use the DataControlBase.MRUColumnFilterListCount property to specify the maximum number of MRU items.
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No
| |
(Blanks) and (Non Blanks) items
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Yes
(Blanks) - Displays records with DBNull values in the current column.
(Non Blanks) - Displays records without DBNull values in the current column.
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Yes
Set DataControlBase.ImplyNullLikeEmptyStringWhenFiltering to true.
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Add custom items
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Yes
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No
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Delete individual items
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Yes
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Yes
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Limit the number of items
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Yes
A drop-down filter displays all unique values in a column. Specify the ColumnBase.ColumnFilterPopupMaxRecordsCount property to limit the number of items in the drop-down filter.
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Yes
A drop-down filter displays all unique values in a column. Specify the ColumnBase.ColumnFilterPopupMaxRecordsCount property to limit the number of items in the drop-down filter.
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Display only the records that meet the current filter criteria
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Yes
Set the DataControlBase.ShowAllTableValuesInFilterPopup (ColumnBase.ShowAllTableValuesInFilterPopup) property to false.
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Yes
Set the DataControlBase.ShowAllTableValuesInCheckedFilterPopup (ColumnBase.ShowAllTableValuesInCheckedFilterPopup) property to false.
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Immediate update
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Selecting an item automatically updates the column’s filter and closes the drop-down filter.
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Use the ColumnBase.ImmediateUpdateColumnFilter property to enable or disable automatic updates. If automatic updates are disabled, the filter is applied after the drop-down filter is closed.
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Allowed filters
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If AllowedBinaryFilters.Equals is disabled, the drop-down filter hides unique values.
If AllowedUnaryFilters.IsNull is disabled, the drop-down filter list hides the (Blanks) item.
If AllowedUnaryFilters.IsNotNull is disabled, the drop-down filter list hides the (NotBlanks) item.
The filter button is hidden if all these criteria are disabled.
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For non-nullable columns:
For nullable columns:
For non-nullable date-time columns when the ColumnBase.RoundDateTimeForColumnFilter is true and the ColumnBase.ColumnFilterMode is Value :
For nullable date-time columns when the ColumnBase.RoundDateTimeForColumnFilter is true and the ColumnBase.ColumnFilterMode is Value :
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