String Length in Pixels

How can I obtain the lenght of a string (given a font , size weight etc) in Pixels? I have seen recomendations to try System.Drawing.Graphics.* but tha开发者_JS百科t Assembly / Namespace doesn't seem to be available to me in silverlight.

I hope to center a text box under an image, but the text is provided dynamically.

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Since your goal is to Centre the TextBox don't mess around with calculating width etc. Just tell the Container to centre the textbox.

eg.

<Grid>
    <Image Source="ToolBox Avatar.png" Stretch="Fill"/>
    <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="TextBlock" TextWrapping="Wrap"/>
</Grid>

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Thought I not familiar with developing for Silverlight, I think that this might be of use to you.