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Asked: 2026-05-10T17:18:32+00:00

The following code has a simple binding which binds the Text of the TextBlock

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The following code has a simple binding which binds the Text of the TextBlock named MyTextBlock to TextBox’s Text and ToolTip property using the exact same Binding notation:

<StackPanel>     <TextBlock x:Name='MyTextBlock'>Foo Bar</TextBlock>     <TextBox    Text='{Binding ElementName=MyTextBlock, Path=Text, StringFormat='It is: \{0\}'}'              ToolTip='{Binding ElementName=MyTextBlock, Path=Text, StringFormat='It is: \{0\}'}' /> </StackPanel>

The binding also uses the StringFormat property introduced with .NET 3.5 SP1 which is working fine for the above Text property but seems to be broken for the ToolTip. The expected result is ‘It is: Foo Bar’ but when you hover over the TextBox, the ToolTip shows only the binding value, not the string formatted value. Any ideas?

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1 Answer

  1. The following is a wordy solution but it works. 

    <StackPanel>   <TextBox Text='{Binding Path=., StringFormat='The answer is: {0}'}'>     <TextBox.DataContext>       <sys:Int32>42</sys:Int32>     </TextBox.DataContext>     <TextBox.ToolTip>       <ToolTip Content='{Binding}' ContentStringFormat='{}The answer is: {0}' />     </TextBox.ToolTip>   </TextBox> </StackPanel>

    I would prefer a much simpler syntax, something like the one in my original question.

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