private bool IsTextTrimmed(TextBlock textBlock)

        {

            Typeface typeface = new Typeface(

                textBlock.FontFamily,

                textBlock.FontStyle,

                textBlock.FontWeight,

                textBlock.FontStretch);

            FormattedText formattedText = new FormattedText(

                textBlock.Text,

                System.Threading.Thread.CurrentThread.CurrentCulture,

                textBlock.FlowDirection,

                typeface,

                textBlock.FontSize,

                textBlock.Foreground);bool isTrimmed = formattedText.Width > textBox.Width;
　　　　　　　return isTrimmed;
　　　　 }