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How to display custom error icon in WinForms GridGroupingControl?

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Display custom error icon

To draw an error icon at the left side of the cell text rectangle, use the CustomCellRenderer and CustomCellModel for GridTextBoxCellRenderer and GridTextBoxCellModel respectively. Then, override the OnDraw method in CustomCellRenderer.

Creating Cell Model


public class CustomCellModel : GridTextBoxCellModel
    public CustomCellModel(GridModel grid)
        : base(grid)
    public override GridCellRendererBase CreateRenderer(GridControlBase control)
        return new CustomCellRenderer(control, this);



Public Class CustomCellModel
    Inherits GridTextBoxCellModel
    Public Sub New(ByVal grid As GridModel)
    End Sub
    Public Overrides Function CreateRenderer(ByVal control As GridControlBase) As GridCellRendererBase
        Return New CustomCellRenderer(control, Me)
    End Function
End Class


Creating Cell Renderer


public class CustomCellRenderer : GridTextBoxCellRenderer
    public CustomCellRenderer(GridControlBase grid, GridCellModelBase cellModel)
        : base(grid, cellModel)
    protected override void OnDraw(Graphics g, Rectangle clientRectangle, int rowIndex, int colIndex, GridStyleInfo style)
        if (this.Grid.CurrentCell.HasCurrentCellAt(rowIndex, colIndex) && this.Grid.CurrentCell.IsEditing
            && !this.Grid.CurrentCell.IsValid)
            Rectangle rect = clientRectangle;
            Bitmap bitmap = SystemIcons.Error.ToBitmap();
            rect = GridUtil.CenterInRect(rect, new Size(20, 20));
            g.DrawImage(bitmap, new Rectangle(clientRectangle.X, rect.Y, bitmap.Width -10, rect.Height));
            base.OnDraw(g, new Rectangle(clientRectangle.X + bitmap.Width, clientRectangle.Y, clientRectangle.Width - bitmap.Width, clientRectangle.Height), rowIndex, colIndex, style);
            base.OnDraw(g, clientRectangle, rowIndex, colIndex, style);



Public Class CustomCellRenderer
    Inherits GridTextBoxCellRenderer
    Public Sub New(ByVal grid As GridControlBase, ByVal cellModel As GridCellModelBase)
        MyBase.New(grid, cellModel)
    End Sub
    Protected Overrides Sub OnDraw(ByVal g As Graphics, ByVal clientRectangle As Rectangle, ByVal rowIndex As Integer, ByVal colIndex As Integer, ByVal style As GridStyleInfo)
        If Me.Grid.CurrentCell.HasCurrentCellAt(rowIndex, colIndex) AndAlso Me.Grid.CurrentCell.IsEditing AndAlso (Not Me.Grid.CurrentCell.IsValid) Then
            Dim rect As Rectangle = clientRectangle
            Dim bitmap As Bitmap = SystemIcons.Error.ToBitmap()
            rect = GridUtil.CenterInRect(rect, New Size(20, 20))
            g.DrawImage(bitmap, New Rectangle(clientRectangle.X, rect.Y, bitmap.Width - 10, rect.Height))
            MyBase.OnDraw(g, New Rectangle(clientRectangle.X + bitmap.Width, clientRectangle.Y, clientRectangle.Width - bitmap.Width, clientRectangle.Height), rowIndex, colIndex, style)
            MyBase.OnDraw(g, clientRectangle, rowIndex, colIndex, style)
        End If
    End Sub
End Class


Adding CellModel and Assigning CellType


this.gridGroupingControl1.TableControl.CurrentCell.ShowErrorIcon = false;
this.gridGroupingControl1.TableModel.CellModels.Add("CustomCell", new CustomCellModel(this.gridGroupingControl1.TableModel));
this.gridGroupingControl1.TableDescriptor.Appearance.AnyRecordFieldCell.CellType = "CustomCell";



Me.gridGroupingControl1.TableControl.CurrentCell.ShowErrorIcon = False
Me.gridGroupingControl1.TableModel.CellModels.Add("CustomCell", New CustomCellModel(Me.gridGroupingControl1.TableModel))
Me.gridGroupingControl1.TableDescriptor.Appearance.AnyRecordFieldCell.CellType = "CustomCell"


Display the customize error icon


C#: CustomizeErrorIcon_CS

VB: CustomizeErrorIcon_VB



I hope you enjoyed learning about how to display custom error icon at the left side of the cell in WinForms GridGroupingControl.

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