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How to display only the item and not display the caption when the group has only one item in WinForms GridGroupingControl?

Platform: WinForms |
Control: GridGroupingControl |
Published Date: April 21, 2015 |
Last Revised Date: January 28, 2020

Captionsection

When a group has only one item, you can create a Custom Grouping Engine and override the IsChildVisible() property to display the single item group without a caption.

In the override, you have check whether the passed-in element is a CaptionSection, and then check its record count, to decide whether it returns True or False, indicating whether the caption is to be displayed or not.

To make sure that the single record CaptionSection is always displayed as expanded, you can add a check to the IsChildVisible override when the passed-in element is a DetailsSection.

C#

public override bool IsChildVisible(Element el)
{
    if (el is CaptionSection)
    {
       if (this.Details == null || this.Records.Count == 0 || this.Records.Count > 1)
          return true;
       else
          return false;
    }
    else if (el is DetailsSection)
    {
       if (this.Details == null || this.Records.Count == 0 || this.Records.Count > 1)
          return el.ParentGroup.IsExpanded;
       else
          return true;
    }
    else
       return el.ParentGroup.IsExpanded;
}

VB

Public Overrides Function IsChildVisible(ByVal el As Element) As Boolean
    If TypeOf el Is CaptionSection Then
       If Me.Details Is Nothing OrElse Me.Records.Count = 0 OrElse Me.Records.Count > 1 Then
          Return True
       Else
          Return False
       End If
       ElseIf TypeOf el Is DetailsSection Then
          If Me.Details Is Nothing OrElse Me.Records.Count = 0 OrElse Me.Records.Count > 1 Then
             Return el.ParentGroup.IsExpanded
          Else
             Return True
          End If
    Else
       Return el.ParentGroup.IsExpanded
    End If
End Function

Samples:

C#: GroupCaption-C#

VB: GroupCaption-VB

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