While grouping the GridComboBoxColumn, the Group key displayed in the GroupCaptionText is based on the SelectedValuePath instead of the DisplayMemberPath of the GridComboBoxColumn. In the following code example, GridComboBoxColumn is defined with the DisplayMemberPath and SelectedValuePath.
The following is the ViewModel class with ItemsSource for the GridComboBoxColumn.
In the following screenshot, the GroupKey displays the actual value instead of the display value of the column.
Figure 1: SfDataGrid with GroupKey displaying the actual value
It is possible to display the GroupKey based on the DisplayMemberPath in the GroupCaptionText by setting the GroupColumnDescription.Converter property that converts the actual value based on the DisplayMemberPath. GridComboBoxColumn is passed as the Converter parameter, and the underlying record bound with the row is passed as the value for the converter. Refer to the following code example for customizing the GroupColumnDescription with the Converter defined.
The following is the Converter that returns the GroupKey based on the DisplayMemberPath by using the value, Record, and the parameter, Column, passed.
The following screenshot shows the GroupKey changed based on the DisplayMemberPath.
Figure 2: GroupKey changed
When you group at runtime by dragging and dropping the column into the GroupDropArea, you can set the Converter by handling SfDataGrid.View.GroupDescriptions.CollectionChanged as shown in the following code example.
Note: The following code example explains how to change the GroupKey in GroupCaptionText based on DisplayMember of MultiColumnDropDownList.
C#, Converter class
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