Created
April 9, 2015 19:12
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WPF backwards compatibility issue
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| namespace WpfApplication1 | |
| { | |
| using System; | |
| using System.ComponentModel; | |
| using System.Diagnostics; | |
| using System.Globalization; | |
| using System.Runtime.CompilerServices; | |
| using System.Windows; | |
| using System.Windows.Data; | |
| using WpfApplication1.Annotations; | |
| /// <summary> | |
| /// Interaction logic for MainWindow.xaml | |
| /// </summary> | |
| public partial class MainWindow : Window | |
| { | |
| public MainWindow() | |
| { | |
| InitializeComponent(); | |
| DataContext = new ViewModel(); | |
| } | |
| } | |
| public class ViewModel : INotifyPropertyChanged | |
| { | |
| private string _value; | |
| public string Value | |
| { | |
| get | |
| { | |
| return _value; | |
| } | |
| set | |
| { | |
| if (value == _value) | |
| { | |
| return; | |
| } | |
| _value = value; | |
| OnPropertyChanged(); | |
| } | |
| } | |
| public event PropertyChangedEventHandler PropertyChanged; | |
| [NotifyPropertyChangedInvocator] | |
| protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null) | |
| { | |
| PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); | |
| } | |
| } | |
| public class Converter : IValueConverter | |
| { | |
| public object Convert(object value, Type targetType, object parameter, CultureInfo culture) | |
| { | |
| Debug.Print($"Convert value: {value}, parameter: {parameter}"); | |
| return value; | |
| } | |
| public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) | |
| { | |
| Debug.Print($"ConvertBack value: {value}, parameter: {parameter}"); | |
| return value; | |
| } | |
| } | |
| } |
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| <Window x:Class="WpfApplication1.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:WpfApplication1" | |
| mc:Ignorable="d" | |
| d:DataContext="{d:DesignInstance local:ViewModel}" | |
| Title="MainWindow" Height="350" Width="525"> | |
| <Window.Resources> | |
| <ResourceDictionary> | |
| <local:Converter x:Key="Conv" /> | |
| </ResourceDictionary> | |
| </Window.Resources> | |
| <StackPanel> | |
| <TextBox Text="{Binding Value, Converter={StaticResource Conv}, | |
| ConverterParameter='param', UpdateSourceTrigger=LostFocus}" /> | |
| <TextBox /> | |
| </StackPanel> | |
| </Window> |
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