wpf WPF Resources Local and application wide resources
Example
If you only need a given resource for a specific control, you can make it more local by adding it to this specific control, instead of the window. It works exactly the same way, the only difference being that you can now only access from inside the scope of the control where you put it:
<StackPanel Margin="10">
<StackPanel.Resources>
<sys:String x:Key="ComboBoxTitle">Items:</sys:String>
</StackPanel.Resources>
<Label Content="{StaticResource ComboBoxTitle}" />
</StackPanel>
In this case, we add the resource to the StackPanel and then use it from its child control, the Label. Other controls inside of the StackPanel could have used it as well, just like children of these child controls would have been able to access it. Controls outside of this particular StackPanel wouldn't have access to it, though.
If you need the ability to access the resource from several windows, this is possible as well. The App.xaml file can contain resources just like the window and any kind of WPF control, and when you store them in App.xaml, they are globally accessible in all of windows and user controls of the project. It works exactly the same way as when storing and using from a Window:
<Application x:Class="WpfSamples.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
StartupUri="WPFApplication/ExtendedResourceSample.xaml">
<Application.Resources>
<sys:String x:Key="ComboBoxTitle">Items:</sys:String>
</Application.Resources>
</Application>
Using it is also the same - WPF will automatically go up the scope, from the local control to the window and then to App.xaml, to find a given resource:
<Label Content="{StaticResource ComboBoxTitle}" />
