Edit a TextBox cell in DataGridView as if it were a normal TextBox (no jumping on pressing arrows)

Question

I have \"multiline\" (wordwrapping) textbox columns in a DataGridView. It would be great to be able to edit them as normal TextBoxes, that is, when I press down arrow, I

Answer 1

This question here showed me a way to solve it. Here is the code:

class MyDataGridView : DataGridView
{

    protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
    {
        if ((keyData == Keys.Enter) && (this.EditingControl != null))
        {
            //new behaviour for Enter
            TextBox tb = (TextBox)EditingControl;
            int pos = tb.SelectionStart;
            tb.Text = tb.Text.Remove(pos, tb.SelectionLength);
            tb.Text = tb.Text.Insert(pos, Environment.NewLine);
            tb.SelectionStart = pos + Environment.NewLine.Length;
            tb.ScrollToCaret();
            //and do nothing else
            return true;
        }
        else if ((keyData == Keys.Up) && (this.EditingControl != null))
        {
            //programmatically move caret up
            //(look at related question to see how)
            return true;
        }
        else if ((keyData == Keys.Down) && (this.EditingControl != null))
        {
            //programmatically move caret down
            //(look at related question to see how)
            return true;
        }
        //for the rest of the keys, proceed as normal
        return base.ProcessCmdKey(ref msg, keyData);
    }
}

So this is a simple change of DataGridView and it works. I only had to

• create this new class, and
• change two lines from the DesignerClass to use MyDataGridView instead of DataGridView (declaration and initialization)

and everything else worked as expected.

Related question: how to programmatically move caret up and down one line.