Wpf textbox text binding not updating is john corbett still dating bo derek
Button has a tiny empty tooltip: This code seemed perfectly fine for me so it took me a lot of time to google the answer.
The only way to make that binding happen doesn't look nice but it's a simple trick: bind to a Grid Data Context.
Conversely, user controls cannot be templated as the XAML is embedded. Net developer then you will likely start with simple CLR properties. Like this: Setting such a property is a snap, and it works just fine. A data binding target MUST be a dependency property.
The simplest user control might look like this: The simplest use of a user control would be like this: In the code above, I simply declare the user control and the rest is done for me. You can reference it in the code behind or you can reference it in the XAML. Once we know the property must be a dependency property (which simply means the property must be backed by a dependency property object) we can start to build it out: In the code above, we create our Text property as a dependency property and we introduce a reusable method called Set Value Dp() which uses the Call Member Name introduced in . Call Member Name let’s you reference your property name without creating a literal string in your code-behind.
Once upon a time there were four friends – two Text Boxes and two Combo Boxes.
They all lived happily on a WPF Window bound together in blissful MVVM harmony.
To use the value converter, reference the namespace of the assembly that contains the converter and add an instance of it to the resources of your window.
Here is a simple value converter that breaks into the debugger.
Recently I struggled on my user control trying to make the dependency property be updated when I change the source of the binding.
That confirmed my belief that WPF does not forgive any single developer’s mistake.
He asked if it is possible to control how frequently a binding target is updated.
Suppose that you have a data source where a property’s value changes very rapidly, perhaps several dozen times per second.
Seriously :-) And now the tooltip looks ok: My original problem was binding a Tool Tip.