How can I build a string resource from other string resources in WPF?

Question

Here's my 'sample code', including what I'm trying to do. Obviously, it doesn't work at the moment, but is there any way I can make it work?

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:System="clr-namespace:System;assembly=mscorlib"
    >
    <System:String x:Key="ProductName">Foo</System:String>
    <System:String x:Key="WindowTitle">{ProductName} + Main Window</System:String>
</ResourceDictionary>

could you use string format in xaml to achieve the same goal blogs.msdn.com/llobo/archive/2008/05/19/… — Aran Mulholland
– Aran Mulholland, Commented Jan 12, 2010 at 22:42

Ray Burns · Accepted Answer · 2010-01-13 03:06:11Z

2

The only way to add a computed string to a ResourceDictionary in this way is to create a MarkupExtension. Your MarkupExtension would be used like this:

<ResourceDictionary ...>
  <sys:String x:Key="ProductName">Foo</sys:String>
  <local:MyStringFormatter
    x:Key="WindowTitle"
    StringFormat="{0} Main Window"
    Arg1="{StaticResource ProductName}" />
</ResourceDictionary>

This assumes you have created a MarkupExtension subclass in your "local" namespace named MyStringFormatterExtension that has properties named "StringFormat", "Arg1", "Arg2", etc, and has a ProvideValue() method that does the obvious.

Note that as Aran points out, a Binding using StringFormatter would be a more common way to achieve the same effect, and is generally the better design. The tradeoff is it would not allow the result to be used as part of a ResourceDictionary.

answered Jan 13, 2010 at 3:06

Ray Burns

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1 Comment

Ant Over a year ago

Excellent - I hadn't come across either of these concepts in my search. Thanks!

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