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You would not want the UI to display all of those values because it would just look like a blur.It would be better to govern how often the binding source’s new values are pushed to the binding target. One solution is to create a value converter which governs the data flow between source and target.Here is the XAML for the demo app’s main Window contents: Here is the entire Update Threshold Converter class: The Update Threshold property represents the number of milliseconds which must elapse between successful attempts to push a new value from the binding source to target.Returning from the Convert method informs the binding system that no values should be updated, leaving the attempt to transfer data as a no-op. To help me demonstrate, I’ve knocked up a toy View Model: it has on it an Available Names property that will be the data source for the List Box, a Selected Names property which is the reason we’re going through the whole exercise, and a Summary property which displays the number of selected items to prove that the data binding is working correctly.I won’t bore you with the code – see the download link below.The Two List Synchronizer code does not make especially thrilling reading, so I won’t show it here.
This listens to Collection Changed events in both collections, and when either changes, it updates the other.
And to prove it works the other way to, I’ve created a Select All command on the View Model that puts all available names into the Selected Names collection.
When you press the button you’ll see that the List Box obediently updates to show all items selected.
As no one gave me an answer, I was forced to use my gray-matter and invent a solution of my own.
Since a similar question came up again recently on Stack Overflow, I thought I’d share what I came up with.