CODEWITHSUNDEEP
wpfdata-bindingstring-formatting
Mathias
Mathias

Reputation: 145

String format for binding text in WPF

Say that I have a static text resource

public static string MainText = "Test: {0} Test2: {1}";

And I then want to use this text in WPF like this

<Label Content="x:Static ***.MainText" />

but bind two values to it, how do I do that?

Upvotes: 0

Views: 1202

Answers (1)

J.H.
J.H.

Reputation: 4322

Here are two ways you can do it, one with a converter and one without.

"Text1" and "Text2" in the bindings are properties of the DataContext.

You will need to change the "MainText" to be a property:

public static string MainText { get; set; } = "Test: {0} Test2: {1}";

Without a converter:

<Label>
    <Label.Content>
        <TextBlock>
            <TextBlock.Text>
                <MultiBinding StringFormat="{x:Static local:MainWindow.MainText}">
                    <Binding Path="Text1" />
                    <Binding Path="Text2" />
                </MultiBinding>
            </TextBlock.Text>
        </TextBlock>
    </Label.Content>
</Label>

With a converter:

<Label>
    <Label.Resources>
        <local:TextFormatConverter x:Key="TextFormatConverter" />
    </Label.Resources>
    <Label.Content>
        <MultiBinding Converter="{StaticResource TextFormatConverter}" ConverterParameter="{x:Static local:MainWindow.MainText}">
            <Binding Path="Text1" />
            <Binding Path="Text2" />
        </MultiBinding>
    </Label.Content>
</Label>

And the converter:

public class TextFormatConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        string fmt = parameter as string;
        if (!string.IsNullOrWhiteSpace(fmt))
            return string.Format(fmt, values);
        return null;
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

Upvotes: 2

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