Inherited TextBox missing CaretIndex property

Question

I have the following code:

public class myTextBox : TextBox
{
    protected override void OnKeyPress(KeyPressEventArgs e)
    {
        base.OnKeyPress(e);
        if (Char.IsDigit(e.KeyChar))  // Digits are OK
        {
            // execpt if cursor is at right end
            if (this.CaretIndex == this.Text.Length)
            {
                e.Handled = true;    // throw away keypress
            }
        }
    }
}

and I get the error:

'MyTextBoxes.myTextBox' does not contain a definition for 'CaretIndex' and no extension method 'CaretIndex'...

even though CaretIndex is a TextBox property: http://msdn.microsoft.com/en-us/library/system.windows.controls.textbox.caretindex(v=vs.110).aspx

score 2 · Answer 1 · answered Feb 23 '14 at 01:53

2

You're looking at the documentation for WPF.

The WPF System.Windows.Controls.TextBox control has a CaretIndex property.

The WinForms System.Windows.Forms.TextBox control does not.

answered Feb 23 '14 at 01:53

Grant Winney

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Oops - missed that (wish it was more prominent in the docs.) Question is now how to determine if the cursor is at the right end of the text...(preferably without resorting to ElementHost.) – Derek Johnson Feb 23 '14 at 02:14

score 0 · Accepted Answer · answered Feb 23 '14 at 02:43

0

Changed this line:

if (this.CaretIndex == this.Text.Length)

to this:

if ((this.Text.Length > 0) && ((this.SelectionStart + this.SelectionLength) == this.Text.Length))

answered Feb 23 '14 at 02:43

Derek Johnson

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score 0 · Answer 3 · answered Feb 23 '14 at 03:55

0

if(this.SelectionStart == this.Text.Length)
{
    e.Handled = true;    // throw away keypress
}

valter

answered Feb 23 '14 at 03:55

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Inherited TextBox missing CaretIndex property

3 Answers3