Listbox not updating when datasource changes wpf Chat pee sex
For the most part, this has made it much easier to improve a user interface’s responsiveness—you can use asynchronous APIs to perform potentially slow work in a way that will not cause your user interface to freeze, and yet you can use simple programming techniques that look very similar to those used in single-threaded code. There are some kinds of slow, IO-oriented work (i.e., the kind of work that often benefits most from asynchrony) where a simple application of these techniques won’t help as much as you might hope.For example, you can run into trouble if you’re doing something that’s slow, but not quite slow enough.
So if you want to know the change in items of the collection you need to subscribe to the Collection Changed event of the Observable Collection But there is a problem with Observable Collection.
Collection Changed event – it does not fire when your data item’s property changes. That is if you have a collection of an Entity “Expense” that has properties “Name” and “Amount” and if you simply change the Amount value in the grid it does not work!
You need to replace the entire “Expense” object for you to see the collection change firing up.
We’re loading a moderately large quantity of data from disk, so at least some of the work will be IO bound, and that’s where async usually shines.
The problem is simple: By default WPF compares Selected Item to each item in the Items Source by reference, meaning that unless the Selected Item points to the same item in memory as the Items Source item, it will decide that the item doesn’t exist in the Items Source and so no item gets selected.