CODEWITHSUNDEEP
wpfbindingstring-formatting
Jerry Nixon
Jerry Nixon

Reputation: 31803

WPF Binding with StringFormat

Could anyone explain to me why this does not render "VALUE IS DEFAULT"?

<TextBlock Text="{Binding Fail, StringFormat=VALUE IS {0}, FallbackValue=DEFAULT}" />

There is something tricky about this syntax I am missing. Thank you in advance.

Upvotes: 7

Views: 4262

Answers (3)

Gerrrard
Gerrrard

Reputation: 65

I think it could also work using the runs inside the TextBlock :

     <TextBlock>
             <Run Text="Value is : "/>
             <Run Text="{Binding Fail,FallbackValue=Default}"/>
     </TextBlock>

?

Upvotes: 1

decyclone
decyclone

Reputation: 30810

Binding in WPF does not consider StringFormat while falling back to FallbackValue in case it fails.

You can use what leon suggested or go with PriorityBinding.

--EDIT--

This should work:

<TextBlock DataContext="{Binding Fail, FallbackValue=DEFAULT}" Text="{Binding StringFormat=VALUE IS {0}}" />

Upvotes: 7

leon.io
leon.io

Reputation: 2824

The default fallback value is used for priority bindings, if you'd like to display "VALUE IS DEFAULT" for a fallback value, try the following.

<TextBlock Text="{Binding Fail, StringFormat=VALUE IS {0}, FallbackValue='VALUE IS DEFAULT'}" />

Upvotes: 0

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