If you look at TextBlock
you will see that ContentProperty is set to Inlines
[Localizability(LocalizationCategory.Text), ContentProperty("Inlines")]
public class TextBlock : FrameworkElement, ...
This means that you will add Inline
elements to the property Inlines
for everyting added between the opening and closing tag of TextBlock
.
So the c# equivalent to your Xaml is
TextBlock textBlock = new TextBlock();
textBlock.FontSize = 18;
textBlock.Inlines.Add("This is my text");
textBlock.Inlines.Add(new LineBreak());
Run run = new Run("My big bold text");
run.FontSize = 24;
run.FontWeight = FontWeights.Bold;
textBlock.Inlines.Add(run);
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