Wpf combobox selecteditem not updating Sexy older womendating sites like flirtomatic without emails needed

Posted by / 26-Jul-2017 05:13

Wpf combobox selecteditem not updating

A Binding performs synchronisation between two properties.

If and only if the binding is done in Two Way mode then the target is able to update the source value (the Text Block is able to update the View Model).

A binding is done between two objects : the source (where the data comes from) and the target (where the data go to).

For example if you bind the Text property of a Text Block to a property “Name” of your View Model, the Text Block is the target and the source is your View Model.

Instead, the source was updated only after focus was lost on the Text Box.

This behavior is controlled by a property on the binding called Update Source Trigger.

This synchronisation is done immediately : each change of the target value, even a tiny tiny one update the source.

The other options are Property Changed, Lost Focus and Explicit.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 Update Source 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: As you can see, each of the three textboxes now uses a different Update Source Trigger. I tried letting the underlying value appear to change so that I could change it back to the original value on a Begin Invoke operation. I would think that simply raising Property Changed would tell WPF that to re-query the value. It sort of makes sense once you get it working, but this is definitely not intuitive.

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Hmmm I never knew that you could ctrl-click on the combobox to reset that value to -1.

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