WPF/INotifyPropertyChanged, change the value of txtA, the txtB and txtC should change automatically?
- by user1033098
I supposed, once i change the value of txtA, the txtB and txtC would change automatically, since i have implemented INotifyPropertyChanged for ValueA.
But they were not updated on UI. txtB was always 100, and txtC was always -50.
I don't know what's the reason.
My Xaml..
<Window x:Class="WpfApplicationReviewDemo.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<StackPanel>
<TextBox Name="txtA" Text="{Binding ValueA}" />
<TextBox Name="txtB" Text="{Binding ValueB}" />
<TextBox Name="txtC" Text="{Binding ValueC}" />
</StackPanel>
</Window>
My code behind...
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.DataContext = new Model();
}
}
public class Model : INotifyPropertyChanged
{
private decimal valueA;
public decimal ValueA { get {
return valueA;
}
set
{
valueA = value;
PropertyChanged(this, new PropertyChangedEventArgs("ValueA"));
}
}
private decimal valueB;
public decimal ValueB
{
get
{
valueB = ValueA + 100;
return valueB;
}
set
{
valueB = value;
PropertyChanged(this, new PropertyChangedEventArgs("ValueB"));
}
}
private decimal valueC;
public decimal ValueC
{
get
{
valueC = ValueA - 50;
return valueC;
}
set
{
valueC = value;
PropertyChanged(this, new PropertyChangedEventArgs("ValueC"));
}
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
}
After i add code to the set method of ValueA property, it works.
public decimal ValueA { get {
return valueA;
}
set
{
valueA = value;
PropertyChanged(this, new PropertyChangedEventArgs("ValueA"));
PropertyChanged(this, new PropertyChangedEventArgs("ValueB"));
PropertyChanged(this, new PropertyChangedEventArgs("ValueC"));
}
}
But I supposed it should be automatically refresh/updated for txtB and txtC. Please advise.
