Wpf combobox text not updating


16-Jul-2017 04:05

The Dispatcher Timer class works by specifying an interval and then subscribing to the Tick event that will occur each time this interval is met.The Dispatcher Timer is not started before you call the Start() method or set the Is Enabled property to true.Just be aware that if you do something complicated in your Tick event, it shouldn't run too often, like in the last example where the timer ticks each millisecond - that will put a heavy strain on the computer running your application.Also be aware that the Dispatcher Timer is not 100% precise in all situations.

wpf combobox text not updating-86

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In Win Forms, there's a control called the Timer, which can perform an action repeatedly within a given interval.WPF has this possibility as well, but instead of an invisible control, we have the Dispatcher Timer control.It does pretty much the same thing, but instead of dropping it on your form, you create and use it exclusively from your Code-behind code.Let's try a simple example where we use a Dispatcher Timer to create a digital clock: The XAML part is extremely simple - it's merely a centered label with a large font size, used to display the current time.

Code-behind is where the magic happens in this example.

To show what the Dispatcher Timer is capable of, let's try updating more frequently... As you can see, we now ask the Dispatcher Timer to fire every millisecond!



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