How to differentiate combobox column from other columns in WinForms DataGrid?
Differentiate combobox column from other columns
Normally, the drop-down arrow for GridComboBoxColumn will be shown only in the edit mode. You can differentiate the combo box column from other columns by showing the drop-down arrow in the display mode by creating custom renderer for the combo box column in WinForms DataGrid.
C#
public Form1()
{
InitializeComponent();
this.sfDataGrid1.CellRenderers["ComboBox"] = new CustomComboBoxCellRenderer();
}
public class CustomComboBoxCellRenderer : GridComboBoxCellRenderer
{
protected override void OnRender(Graphics paint, Rectangle cellRect, string cellValue, CellStyleInfo style, DataColumnBase column, Syncfusion.WinForms.GridCommon.ScrollAxis.RowColumnIndex rowColumnIndex)
{
base.OnRender(paint, cellRect, cellValue, style, column, rowColumnIndex);
var dropDownbuttonRect = new Rectangle(cellRect.X + cellRect.Width - 17, cellRect.Y + (cellRect.Height / 2), 8, 4);
paint.DrawLine(new Pen(Color.Gray), dropDownbuttonRect.X, dropDownbuttonRect.Y, dropDownbuttonRect.X + (dropDownbuttonRect.Width / 2), dropDownbuttonRect.Y + dropDownbuttonRect.Height);
paint.DrawLine(new Pen(Color.Gray), dropDownbuttonRect.X + dropDownbuttonRect.Width, dropDownbuttonRect.Y, dropDownbuttonRect.X + (dropDownbuttonRect.Width / 2), dropDownbuttonRect.Y + dropDownbuttonRect.Height);
}
}
VB
Public Sub New()
InitializeComponent()
Me.sfDataGrid1.CellRenderers("ComboBox") = New CustomComboBoxCellRenderer()
End Sub
Public Class CustomComboBoxCellRenderer
Inherits GridComboBoxCellRenderer
Protected Overrides Sub OnRender(ByVal paint As Graphics, ByVal cellRect As Rectangle, ByVal cellValue As String, ByVal style As CellStyleInfo, ByVal column As DataColumnBase, ByVal rowColumnIndex As Syncfusion.WinForms.GridCommon.ScrollAxis.RowColumnIndex)
MyBase.OnRender(paint, cellRect, cellValue, style, column, rowColumnIndex)
Dim dropDownbuttonRect = New Rectangle(cellRect.X + cellRect.Width - 17, cellRect.Y + (cellRect.Height \ 2), 8, 4)
paint.DrawLine(New Pen(Color.Gray), dropDownbuttonRect.X, dropDownbuttonRect.Y, dropDownbuttonRect.X + (dropDownbuttonRect.Width \ 2), dropDownbuttonRect.Y + dropDownbuttonRect.Height)
paint.DrawLine(New Pen(Color.Gray), dropDownbuttonRect.X + dropDownbuttonRect.Width, dropDownbuttonRect.Y, dropDownbuttonRect.X + (dropDownbuttonRect.Width \ 2), dropDownbuttonRect.Y + dropDownbuttonRect.Height)
End Sub
End Class
Sample: How to differentiate combobox column from other columns in non-editable display mode?
Conclusion
I hope you enjoyed learning about how to differentiate combobox column from other columns in WinForms DataGrid.
You can refer to our WinForms DataGrid feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications.
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