wpf - binding stringformat on label using string literal

Question

I've binded the tooltip of a slider control to it's Value property and i'm trying to use StringFormat to make it display "Current Value {0} of 10" where the {0} is the Value property. Below is one of the various things I tried when trying to figure this out.

<Slider.ToolTip>
  <Label>
    <Label.Content>
      <Binding StringFormat="Current Value {0} of 10"
               ElementName="DebugLevelSlider"
               Path="Value" />
    </Label.Content>
  </Label>
</Slider.ToolTip>

I am having issues finding examples online of how to use stringformat with string literals such as mine above. I see a lot of stringformat date/time/currency format conversion. I think I have a way to do this with a multibinding but it just seems like an extra amount of work than necessary. I hope that for string literal formatting I still do not have to write a custom converter.

In my app I find myself using a lot of extra labels next to items so getting an understanding in the stringformat will hopefully let me eliminate some of those unnecessary labels.

Answer 1

Label.Content is object so you can't use Binding.StringFormat there as the binding's target type must be string in order for it to work.

Two work arounds are: use TextBlock instead of Label and bind the Text property.

Use Label.ContentStringFormat i.e.

<Label ContentStringFormat="Current Value {0} of 10" Content={Binding ...} />

You only need to escape the string with {} if your first character is a {

Answer 2

For the ToolTip, you can check out WPF binding with StringFormat doesn't work on ToolTips.

As far as the StringFormat you specified above, you have to escape your string.

StringFormat="{}Current Value {0} of 10"

Here are a bunch of StringFormat examples. http://blogs.msdn.com/b/llobo/archive/2008/05/19/wpf-3-5-sp1-feature-stringformat.aspx