Visible line count of a TextBlock

Question

If you set TextWrapping to \"Wrap\", a WPF TextBlock can have several lines of text. Is there a \"clean\" way to get the number of lines of text? I considered looking at the

Answer 1

// this seems to do the job        





        /// 

        /// we need to limit a multi line textbox at entry time
        /// 
        /// 
        /// The sender.
        /// 
        /// 
        /// The e.
        /// 
        private void DescriptionTextBox_PreviewKeyDown(object sender, System.Windows.Input.KeyEventArgs e)
        {
            TextBox thisTextBox = sender as TextBox;
            if (thisTextBox != null)
            {
                // only check if we have passed the MaxLines 
                if (thisTextBox.LineCount > thisTextBox.MaxLines)
                {
                    // we are going to discard the last entered character
                    int numChars = thisTextBox.Text.Length;

                    // force the issue
                    thisTextBox.Text = thisTextBox.Text.Substring(0, numChars - 1);

                    // set the cursor back to the last allowable character
                    thisTextBox.SelectionStart = numChars - 1;

                    // disallow the key being passed in
                    e.Handled = true;
                }
            }
        }