Wpf datatrigger not updating Xxx chat serbia
VISIBLE AND COLOR = GREEN IF ISDIRTY AND NOT ISVALID THEN VISIBILITY EQ VISIBILITY.
VISIBLE AND COLOR = RED The Style for a Toggle Button below gets the conditions right on the first update but doesn't change thereafter.
They work by creating a binding to a regular property, which is then monitored for changes.
This also opens up for binding your trigger to a property on a different control.
So far in this tutorial, we have mostly created bindings between UI elements and existing classes, but in real life applications, you will obviously be binding to your own data objects.
This is just as easy, but once you start doing it, you might discover something that disappoints you: Changes are not automatically reflected, like they were in previous examples.
Obviously you only have to call Notify Property Changed in the setter's of the properties that you bind to - the rest can remain the way they are.
The Observable Collection on the other hand is very easy to deal with - it simply requires you to use this specific list type in those situations where you want changes to the source list reflected in a binding destination.
This is the price you will have to pay if you want to bind to your own classes and have the changes reflected in the UI immediately.
Conversely, if the first update makes the vm invalid, the color is correctly set to Red, but a second update that corrects the invalid error but leaves the vm dirty does not change the color to Green. I haven't tried the Visual State Manager yet, but would that be a preferred way to go?
So far, we worked with styles by setting a static value for a specific property.
It's called Observable Collection, and you use it much like a regular List - that's all it takes!
This will make the Add and Delete button work, but it won't do anything for the "Change name" button, because the change will happen on the bound data object itself and not the source list - the second step will handle that scenario though.However, using triggers, you can change the value of a given property, once a certain condition changes.