Wpf listbox observablecollection not updating

We can try the same trick of holding back the data source until we’re ready with the synchronous case: collection caused WPF to attach a change notification handler.

The reason this takes so much longer is that we’ve given the program much more work to do.For example, you can run into trouble if you’re doing something that’s slow, but not quite slow enough.If you want to display a large amount of data from a file, a naive asynchronous (or, for that matter, multithreaded) approach can run into problems.So we’re being slightly unfair on the asynchronous version by removing its main opportunity to show an advantage.However, since the IO only slows things down by about 1.4 seconds when things aren’t in the cache, it’s hard to see how the asynchronous code might make up the deficit even in more favourable conditions.

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