Grouping with WPF GridDataControl

With the Vol. 3 release, the much awaited grouping and summaries support for the WPF grid will be out. This support works with the CollectionView grouping mode. The summaries are not a part of CollectionView grouping logic, so we included high-level functions that will calculate the summaries of a group dynamically using LINQ methods. This only has the constraint of using IEnumerable<T> implemented data sources.

Interactive grouping

Considering you have the GridDataControl added in the XAML markup, just adding the following code snippet would let you define grouped columns.

<syncfusion:GridDataControl.GroupedColumns>
    <syncfusion:GridDataGroupColumn ColumnName="ShipCountry"/>
</syncfusion:GridDataControl.GroupedColumns>

Defining Summaries

There are three different types of summaries present in GDC:

• Table Summary
• Group Summary
• Group Caption Summary

All of these have the same syntax to declare. You also have the option of seeing what kind of summary the end-user would prefer.

XAML code snippet:

Table Summary

<syncfusion:GridDataControl.TableSummaryRows>
    <syncfusion:GridDataSummaryRow ShowSummaryInRow=”True” Title=”Total Freight: {FreightSummary} For {CountSummary} Items” TitleColumnCount=”2″>
        <syncfusion:GridDataSummaryRow.SummaryColumns>
            <syncfusion:GridDataSummaryColumn Name=”FreightSummary” MappingName=”Freight” SummaryType=”Int32Aggregate” Format=”‘{Sum:c}'” />
            <syncfusion:GridDataSummaryColumn Name=”CountSummary” MappingName=”OrderDate” SummaryType=”CountAggregate” Format=”‘{Count:d}'” />
        </syncfusion:GridDataSummaryRow.SummaryColumns>
    </syncfusion:GridDataSummaryRow>
</syncfusion:GridDataControl.TableSummaryRows>

Group Summary

<syncfusion:GridDataControl.SummaryRows>
    <syncfusion:GridDataSummaryRow ShowSummaryInRow=”True” Title=”‘Charges – {FreightSummary} for {OrderCount} Items'”>
        <syncfusion:GridDataSummaryRow.SummaryColumns>
            <syncfusion:GridDataSummaryColumn Name=”FreightSummary”  MappingName=”Freight” SummaryType=”Int32Aggregate” Format=”‘{Sum:c}'” />
            <syncfusion:GridDataSummaryColumn Name=”OrderCount” MappingName=”OrderDate” SummaryType=”CountAggregate” Format=”‘{Count}'” />
        </syncfusion:GridDataSummaryRow.SummaryColumns>
    </syncfusion:GridDataSummaryRow>
</syncfusion:GridDataControl.SummaryRows>

Group Caption Summary

<syncfusion:GridDataControl.CaptionSummaryRow>
    <syncfusion:GridDataSummaryRow ShowSummaryInRow=”False” Title=”‘{Count} Items'” TitleColumnCount=”2″>
        <syncfusion:GridDataSummaryRow.SummaryColumns>
            <syncfusion:GridDataSummaryColumn Name=”FreightSummary”  MappingName=”Freight” SummaryType=”Int32Aggregate” Format=”‘{Sum:##}'” > 
            </syncfusion:GridDataSummaryColumn>
        </syncfusion:GridDataSummaryRow.SummaryColumns>
    </syncfusion:GridDataSummaryRow>
</syncfusion:GridDataControl.CaptionSummaryRow>

You may notice that each GridDataSummaryColumn has a Format property. This property specifies the value of the Summary and replaces it with a string that gets formatted. The below values are present for different summary types,

CountAggregate

• Count

DoubleAggregate/Int32Aggregate

• Count
• Max
• Min
• Sum
• Average

We can also add custom summaries and plug into the grid, but that needs a separate post to explain the workflow.