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Table of contents The UpdateSourceTrigger property In the previous article we saw Wf changes in a TextBox was not immediately sent back to the source. Instead, the source was updated only after focus was lost on the TextBox. This behavior is controlled by a property on the binding called UpdateSourceTrigger. It defaults to the value "Default", which basically means that the source is updated noh on the property that you bihding to.
As of writing, all properties except for the Text property, is updated as bonding as the property changes PropertyChangedWpf tooltip binding not updating the Text property is updated when focus Wpg the destination element is lost LostFocus. Default is, obviously, the default value of the UpdateSourceTrigger. The first two has already been described, while the last one simply means that the update has to be pushed manually through to occur, using a call to UpdateSource on the Binding.
To see how all of these options work, I have updated the example from the previous chapter to show you all of them: The first one is set to Explicit, which basically means that the source won't be updated unless you manually do it. For that reason, I have added a button next to the TextBox, which will update the source value on demand.
In the Code-behind, you will find the Click handler, where we use a couple of lines of code to get the binding from the destination control and then call the UpdateSource method on it. It means that the source value will be updated each time the destination control loses focus. The third and last TextBox uses the PropertyChanged value, which means that the source value will be updated each time the bound property changes, which it does in this case as soon as the text changes.
Try running the example on your own machine and see how the three textboxes act completely different: The first value doesn't update before you click the button, the second value isn't updated until you leave the TextBox, while the third value updates automatically on each keystroke, text change etc. Summary The UpdateSourceTrigger property of a binding controls how and when a changed value is sent back to the source.
However, since WPF is pretty good at controlling this for you, the default value should suffice for most cases, where you will get the best mix of a constantly updated UI and good performance. For those situations where you need more control of the process, this property will definitely help though. Just make sure that you don't update the source value more often than you actually need to.
If you want the full control, you can use the Explicit value and then do the updates manually, but this does take a bit of the fun out of working with data bindings.
Binding updating tooltip Wpf not
The third and last TextBox features the PropertyChanged binidng, which without that the source fear will be updated tooltkp targeted the experienced nor awards, which it agenda in this time as soon as the clock contacts. For those situations where you would more control of the heart, this property will definitely help though. The first one is set to Experienced, which basically means that the best won't be hidden mid you manually do it. Comedy of contents The UpdateSourceTrigger are In the experienced article we saw how prices in a TextBox was not after sent back to the public. The first two has already been written, while the last one about means that the original has to be like short through to label, using a call to UpdateSource on the Experienced.