How to use variable text in a Binding StringFormat?

Question

So I would like to have a variable StringFormat in a binding, but I'm not sure how to do that. I don't mind if it's XAML or code behind. Here's what I currently have:

<TextBlock x:Name="TextBlockSpellSkill" Text="{Binding CurrentValue, StringFormat=Spell: {0}}" />

However, I would like to be able to change the prefix "Spell:" to, for example "Skill:" based on a variable in my model. The easiest way would be if I could do it in code behind something like this:

if (true)
{
    TextBlockSpellSkill.StringFormat = "Spell: {0}";
}
else
{
    TextBlockSpellSkill.StringFormat = "Skill: {0}";
}

but I couldn't find any way to just set the string format from code-behind. If there's a good way to do it in XAML I'm cool with that too!

Thanks

123 456 789 0 · Accepted Answer · 2014-07-01 20:09:51Z

2

The StringFormat that you are using is for Binding. What you want to do is something like this

var textBlock = new TextBlock();
var binding = new Binding("CurrentValue");
binding.StringFormat = "Spell : {0}";
textBlock.SetBinding(TextBlock.TextProperty, binding);

answered Jul 1, 2014 at 20:09

123 456 789 0

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2 Comments

Tevis Over a year ago

Awesome! Still new to the whole binding paradigm and XAML syntax for it makes my head hurt :) I'll accept when it opens up

123 456 789 0 Over a year ago

@Tevis It's gonna be hard in the beginning but you'll see the awesomeness of bindings. Just keep doing it :)

Ryan Emerle · Accepted Answer · 2014-07-01 20:20:01Z

2

You could do this in a number of ways. One way would be to use a Style Trigger.

<TextBlock x:Name="TextBlockSpellSkill" >
    <TextBlock.Style>
        <Style TargetType="TextBlock">
            <Setter Property="Text" Value="{Binding CurrentValue, StringFormat=Spell: {0}}" />
            <Style.Triggers>
                <DataTrigger Binding="{Binding SomeFlag}" Value="True">
                    <Setter Property="Text" Value="{Binding CurrentValue, StringFormat=Skill: {0}}" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBlock.Style>
</TextBlock>

Another option would be to use an ValueConverter in your binding.

answered Jul 1, 2014 at 20:20

Ryan Emerle

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