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POEventSetters in Theme ResourceDictionary
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copied!<p><a href="http://msdn.microsoft.com/en-us/library/system.windows.eventsetter.aspx" rel="nofollow noreferrer">MSDN says on event setters:</a></p> <blockquote> <p>Event setters cannot be used in a style that is contained in a theme resource dictionary. This is because a theme resource dictionary at run time is often loose binary XAML (BAML) files, and does not have any scope defined where accompanying code-behind that defines the handlers can exist.</p> </blockquote> <p>This is confirmed by <a href="https://stackoverflow.com/questions/13562498/wpf-treeview-style-eventsetter-dont-work">the first answer to this SO question</a>, which states:</p> <blockquote> <p>a resource xaml can't have a code behind file, they are usually called "loose xaml". You can read about that in the msdn about EventSetter.</p> </blockquote> <p>However, I do not yet understand the limitations to event setters. I have tried using a code-behind file for a resource dictionary. I have assigned an event handler for an event of a control contained within a template defined within a style in said resource dictionary - and it worked.</p> <p>Adding an event setter to a style in the same resource dictionary, on the other hand, results in an exception.</p> <p>Have I hit a special case where it happens to work?</p> <p>Or does setting an event handler in a template always work, but if so, then why can't I use an event setter in a style in the same resource dictionary?</p> <p>My question boils down to:</p> <p><strong>What exactly is meant by MSDN's statement that a theme resource dictionary is <em>often</em> loose binary XAML - how often, under what circumstances exactly?</strong></p>

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