RichTextBox behaving weirdly

[Paul E Collins]

I want to colour certain characters as they are typed in a RichTextBox. I
started with this simple event handler.

private void rtb_KeyPress(ob ject sender, KeyPressEventAr gs e)
{
if (e.KeyChar >= ' ')
{
this.SelectedTe xt = e.KeyChar.ToStr ing();
this.SelectionC olor = Color.Blue;

e.Handled = true;
}
}

Why does this code not colour the first character typed into the box? It
works for subsequent characters.

Eq.

[Paul E Collins]

Hmm, okay, it seems that setting SelectedText changes the selection. Here's
what I used in the end.

if (e.KeyChar >= ' ')
{
this.SelectedTe xt = e.KeyChar.ToStr ing();

this.SelectionS tart--;
this.SelectionL ength++;
this.SelectionC olor = GetColourForCha r(e.KeyChar);

this.SelectionS tart++;
this.DeselectAl l();

e.Handled = true;
}

Eq.