Question

I am making a trying to make this combo box: see picture attached. For the LineStyle combo box.

Here’s the code I have so far

public partial class frmDlgGraphOptions : Form
      public partial class frmDlgGraphOptions : Form
    {
        public frmDlgGraphOptions()
        {
            InitializeComponent();
            CmbBoxlineStyles.DropDownStyle = ComboBoxStyle.DropDownList;

        }

        public override void OnDrawItem(DrawItemEventArgs e)
        {
             // Get the item.

      var item = this.CmbBoxlineStyles.SelectedIndex.ToString();
      if(item == null)
         return;

      int startX = e.Bounds.X;
      int startY = (e.Bounds.Y + 1);

      int endX = e.Bounds.X + 5;
      int endY = (e.Bounds.Y + 1);


      //Draw the lines 
      Pen pen = new Pen(Color.Blue);

      e.Graphics.DrawLine(pen, new Point(startX, startY), new Point(endX, endY));



        }

    }

I am getting this error: Error 1 ‘Fdrc.frmDlgGraphOptions.OnDrawItem(System.Windows.Forms.DrawItemEventArgs)’: no suitable method found to override

Thank you
Sun

Answer 1

The Form type doesn’t have a OnDrawItem method hence there is nothing to override. In order to override the method you will need to inherit directly from the ComboBox type.