How to make listview update itself in wpf? Browse other questions tagged wpf data-binding listview or ask your own question. 9 years, 8 months ago.
Data Binding In the previous instalment in this tutorial we looked at the property of controls. This can is set to an object to use as the source for its and those of its children. In the earlier article we used simple bindings to display and values that were controlled directly by the controls in a. When controls update a property that is also the direct source of other bindings, the user interface can update automatically. We saw this with a and a that were bound to the same value. As the Slider was manipulated, the TextBlock showed the changing value.
In some situations, it is not possible for a control to realise that the value to which it is bound has been changed. For example, if a read-only property is calculated according to other, data-bound properties, controls that are linked to the calculated value will not normally update. If the source object is updated programmatically, these changes will not normally be reported to the user interface, which will continue to show old values. To remove this problem, WPF makes use of the INotifyPropertyChanged. If the object held in the DataContext property of a control implements this interface, the control will listen for its PropertyChanged.
![Updating Updating](/uploads/1/2/5/6/125631303/940381808.gif)
![Not Not](/uploads/1/2/5/6/125631303/370100791.png)
This event signals changes to property values. When the event is raised and indicates a change to a control binding, the on-screen value changes accordingly. You can use this automatic behaviour to tell the user interface to update. When an action happens that causes a property to change that would not normally cause an update in the WPF controls bound to it, you raise the event and name the modified property.
WPF handles the rest for you. To demonstrate, we need a sample project. Create a new named, 'INotifyPropertyChangedDemo'. Once ready replace the of the main window with the code below.