Got it, let's sort this out! Your current Label uses a plain string for its Content property, which doesn't support partial text formatting. To get that bold segment in your label text, you'll need to use a TextBlock as the Label's content—since TextBlock allows mixing inline elements with different styles.

Here's the adjusted XAML code you need:

<Label x:Name="Mylabel" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="10">
    <TextBlock>
        I am a label with some <Run FontWeight="Bold">bold</Run> text
    </TextBlock>
</Label>

Quick explanation: #

• We swapped out the plain Content string for a TextBlock nested inside the Label. Label can host any UIElement as its content, not just plain text.
• The <Run> element lets us target specific text segments (here, the word "bold") and apply formatting like FontWeight="Bold", while keeping the rest of the text in the default style.

内容的提问来源于stack exchange，提问作者user9653128