How to get the actual width of TextBlock?

Question

I defined a TextBlock object in the form and set a string for it. Now I want to get its actual pixel width. When I use the following method, cs0618 warning appears. Is there any other way to get it?

var fromatted = new FormattedText(
                        text.Text, CultureInfo.CurrentUICulture, FlowDirection.LeftToRight,
                        new Typeface(text.FontFamily, text.FontStyle, text.FontWeight, text.FontStretch),
                        text.FontSize, text.Foreground);

Answer 1

Solution: Please add ,VisualTreeHelper.GetDpi(this).PixelsPerDip after your text.Foreground.

Explanation: You use the Obsolete FormattedText(String, CultureInfo, FlowDirection, Typeface, Double, Brush), which need to use PixelsPerDip to override , you could refer to official document: FormattedText(String, CultureInfo, FlowDirection, Typeface, Double, Brush) for more details. Its corresponding new method is FormattedText(String, CultureInfo, FlowDirection, Typeface, Double, Brush, Double)

Updated code:

var fromatted = new FormattedText(  
                         text.Text, CultureInfo.CurrentUICulture, FlowDirection.LeftToRight,  
                         new Typeface(text.FontFamily, text.FontStyle, text.FontWeight, text.FontStretch),  
                         text.FontSize, text.Foreground, VisualTreeHelper.GetDpi(this).PixelsPerDip);  

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Answer 2

See the following. If these do not help then your question is not clear.

• FrameworkElement.Width Property
• FrameworkElement.ActualWidth Property

Answer 3

If you need a text block that is resized automatically according to text, then check an example:

<TextBlock HorizontalAlignment="Left" VerticalAlignment="Top" Margin="50,50,0,0" Text="Some text" />

Put it inside a <Grid>, for example. You do not have to calculate and set the width.

I think that such textblock can be inserted programmatically too; then you can get its actual width and reposition it. But maybe you should avoid explicit positioning using the corresponding alignment and margin properties.