I have a simple WPF window with a slider and two textblocks. As the slider moves it updates a data bound object. Now the first textblock updates while the second does not. Why?
You may say there is no INotifyPropertyChanged here. But then why is the first updating? I have pulled my hair enough. Please help.
My WPF app in all its glory is as follows.
<Window x:Class="DataTriggerDemo.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:DataTriggerDemo" mc:Ignorable="d" Title="MainWindow" Height="350" Width="525"> <Grid> <Grid.RowDefinitions> <RowDefinition/> <RowDefinition/> <RowDefinition/> </Grid.RowDefinitions> <Slider x:Name="MySlider" Margin="5" Minimum="0" Maximum="100" Value="{Binding TheValue}"/> <TextBlock Grid.Row="1" Text="{Binding TheValue}" /> <TextBlock Grid.Row="2" Text="{Binding TheValueTwice}" /> </Grid> </Window> And now the code behind.
using System.Windows; namespace DataTriggerDemo { public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); DataContext = new DataObject(); } } public class DataObject { private int _theValue; public int TheValue { get { return _theValue; } set { _theValue = value; TheValueTwice = _theValue * 2; } } private int _theValueTwice; public int TheValueTwice { get { return _theValueTwice; } set { _theValueTwice = value; } } } } 
