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Can a wpf binding know that property value has changed?


Asked by Willa Avalos on Dec 15, 2021 FAQ



However, what is missing is that the binding cannot possibly have any idea that the property value has changed. You need to issue a notification about the property change. You declare your Joke property as a dependency property. This is based on some WPF infrastructure that automatically issues the change notifications.
Thereof,
The “automagic” way that WPF binds its XAML to your properties is through reflection in the framework. It sees {Binding Text} and it goes looking on the data context for a property called “Text”. When it finds that, it invokes ToString () on it, and that’s what appears in the GUI. For notifying change, the same thing happens.
Also, Data binding is a mechanism in WPF applications that provides a simple and easy way for Windows Runtime apps to display and interact with data. In this mechanism, the management of data is entirely separated from the way data. Data binding allows the flow of data between UI elements and data object on user interface.
In fact,
In XAML code, we are binding to a property Name and Age, but we have not selected what object that property belongs to. The easier way is to assign an object to DataContext whose properties we are binding in the following C# code in MainWindowconstructor.
In addition,
In one-way binding, data is bound from its source (that is the object that holds the data) to its target (that is the object that displays the data) Let’s take a simple example to understand one-way data binding in detail. The following XAML code creates two labels, two textboxes, and one button and initializes them with some properties.