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How to summary results on the inner most table be displayed on every parent level in the WinForms GridGroupingControl with nested related tables?
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Summaries
Generally, summary values are displayed in the summary row. To view the summary value of a nested table, you need to expand that table. You can view the summary value of a table without expanding the nested table though the following workaround.
Solution:
The summary results of the nested tables can be obtained by using the GridEngine.GetSummaryText() method. In the following code example, the values are populated in the parent level unbound columns by using the QueryValue event. A hashtable is used to store the values entered in the unbound column as it does not have its own datastore.
C#
//Hooks QueryValue event to set the UnboundCol value.
this.gridGroupingControl1.QueryValue += gridGroupingControl1_QueryValue;
private void gridGroupingControl1_QueryValue(object sender, Syncfusion.Grouping.FieldValueEventArgs e)
{
if (e.TableDescriptor.Name == this.parentTD.Name)
{
Group g = e.Record.NestedTables[0].ChildTable as Group;
e.Value = GridEngine.GetSummaryText(g, "r_sum", "c_sum");
}
else if (e.TableDescriptor == this.childTD)
{
Group g = e.Record.NestedTables[0].ChildTable as Group;
e.Value = GridEngine.GetSummaryText(g, "gc_ROW", "gc_SUM");
}
else if (e.TableDescriptor == this.grandChildTD)
{
object o = this.unboundValues[e.Record.GetValue("GrandChildID").ToString()];
double d;
if (o != null && double.TryParse(o.ToString(), System.Globalization.NumberStyles.Any, null, out d))
{
e.Value = d;
}
}
}
VB
'Hooks the QueryValue event to set the UnboundCol value.
Me.gridGroupingControl1.QueryValue += gridGroupingControl1_QueryValue
Private Sub gridGroupingControl1_QueryValue(ByVal sender As Object, ByVal e As Syncfusion.Grouping.FieldValueEventArgs)
If e.TableDescriptor.Name = Me.parentTD.Name Then
Dim g As Group = TryCast(e.Record.NestedTables(0).ChildTable, Group)
e.Value = GridEngine.GetSummaryText(g, "r_sum", "c_sum")
ElseIf e.TableDescriptor = Me.childTD Then
Dim g As Group = TryCast(e.Record.NestedTables(0).ChildTable, Group)
e.Value = GridEngine.GetSummaryText(g, "gc_ROW", "gc_SUM")
ElseIf e.TableDescriptor = Me.grandChildTD Then
Dim o As Object = Me.unboundValues(e.Record.GetValue("GrandChildID").ToString())
Dim d As Double
If o IsNot Nothing AndAlso Double.TryParse(o.ToString(), System.Globalization.NumberStyles.Any, Nothing, d) Then
e.Value = d
End If
End If
End Sub
The following screenshot displays the summary results:
Figure 1: Summary Results in Parent Level
