Current size Textblock Runtime

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Guys, I have a question that is the following. I am creating a Textblock at runtime with the following code:

TextBlock txtMensagem = new TextBlock();
txtMensagem.Text = texto.Trim();
txtMensagem.TextWrapping = TextWrapping.Wrap;
txtMensagem.Height = Double.NaN;
txtMensagem.Width = Double.NaN;
txtMensagem.MinWidth = 200;
txtMensagem.MaxWidth = 500;
txtMensagem.FontSize = 16;
txtMensagem.FontWeight = FontWeights.Bold;
txtMensagem.FontFamily = new FontFamily("Consolas");
txtMensagem.VerticalAlignment = System.Windows.VerticalAlignment.Top;
txtMensagem.Foreground = Brushes.Black;
txtMensagem.HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
txtMensagem.Margin = new Thickness(15, 30, 0, 25);

After this created Textblock I need to know the current size it has become. Put the command txtMensagem.ActualWidth returns 0. In another project I did the following gambiarra:

gridMensagem.Children.Add(txtMensagem);
Application.Current.Dispatcher.Invoke(DispatcherPriority.Background, new Action(delegate { }));
gridMensagem.Children.Remove(txtMensagem);

//Agora o ActualWidth Funciona
double tamanho = txtMensagem.ActualWidth;

This code I add on the grid, give the command 'Doevents()' for the text to be drawn on the screen and then I remove it, so I can get the size it will occupy with the command txtMensagem.ActualWidth , but the same code does not work in my new project.

Does anyone have any idea what I can do to get the size of Textblock?

Note: I am using WPF

Grateful.

c# wpf

  • See if this helping.

  • Dude, almost hehehe... this gives me the size of the text(Sting), but in my case I would need the size of Textblock. But you could do a trick here, because the size of Textblock will always be between 200 and 500, so if you come back smaller than 200 I consider 200 and if you come back bigger than 500 I consider 500 :)

1 answer

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In the link that the extension passed me I found the following piece of code that worked. I didn’t understand very well how it works but it worked.

TextBlock txtMensagem = new TextBlock();
txtMensagem.Text = texto.Trim();
txtMensagem.TextWrapping = TextWrapping.Wrap;
txtMensagem.Height = Double.NaN;
txtMensagem.Width = Double.NaN;
txtMensagem.MinWidth = 200;
txtMensagem.MaxWidth = 500;
txtMensagem.FontSize = 16;
txtMensagem.FontWeight = FontWeights.Bold;
txtMensagem.FontFamily = new FontFamily("Consolas");
txtMensagem.VerticalAlignment = System.Windows.VerticalAlignment.Top;
txtMensagem.Foreground = Brushes.Black;
txtMensagem.HorizontalAlignment = System.Windows.HorizontalAlignment.Left;
txtMensagem.Margin = new Thickness(15, 30, 0, 25);

//Codigo retirado do comentário do ramaral
txtMensagem.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
txtMensagem.Arrange(new Rect(txtMensagem.DesiredSize));

//Agora o ActualWidth Funciona
double tamanho = txtMensagem.ActualWidth;

Putting these two lines before calling the Actualwidth works.

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