Silverlight, wpf measure TextBlock text problem!

Question

I cannot get proper desired size of my TextBlock.

I have few lines of code:

TextBlock block = new TextBlock();
        block.Style = this.TextStyle;
        block.UpdateLayout();
        block.Measure(new Size(this.ActualWidth, this.ActualHeight));
        block.Text = "3333";

        return block.DesiredSize;

And i cannot solve two problems with it:

1. block.DesiredSize.Width is always zero. When height calculated properly.

2. Desired Size not changes when i set setters for style "TextStyle" For example setter set for FontSize with value 50.

        <Setter Property="FontSize"
               Value="50">
       </Setter>
   

   But Desired height only 15! What wrong with this measure method? And how can i get real size of text block?

Answer 1

Try this

TextBlock block = new TextBlock();
    block.Text = "3333";
    block.Style = this.TextStyle;

    block.Measure(new Size(this.ActualWidth, this.ActualHeight));
    block.UpdateLayout();


    return block.DesiredSize;