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WPF Layer Cake C#, C++/CLI and C

WPF Layer Cake C#, C++/CLI and C. Andy Dent www.andydent.com May 2009. Wandering in WPF. Continuum of structuring a WPF program: Ain’t it cool – do as much in XAML as possible, binding data and all commands/events. Events bound in XAML, commands in code. Bind data only in XAML.

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WPF Layer Cake C#, C++/CLI and C

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  1. WPF Layer CakeC#, C++/CLI and C Andy Dent www.andydent.com May 2009

  2. Wandering in WPF • Continuum of structuring a WPF program: • Ain’t it cool – do as much in XAML as possible, binding data and all commands/events. • Events bound in XAML, commands in code. • Bind data only in XAML. • XAML for layout, code for all bindings. • Silly opposite extreme – no XAML

  3. <Window.CommandBindings> <CommandBinding Command="{x:Static w:TestDespatchWindow.cmdShow2}" Executed="OnShow2" /> </Window.CommandBindings> <Window.InputBindings> <KeyBinding Key="T" Modifiers="Control" Command="{x:Static w:TestDespatchWindow.cmdShow2}" /> </Window.InputBindings> <DockPanel> <MenuDockPanel.Dock="Top"> <MenuItem Header="_File" > <MenuItem Header="E_xit" Command="Close" /> </MenuItem> <MenuItem Header="Test"> <MenuItem Command="{x:Static w:TestDespatchWindow.cmdShow2}" /> </MenuItem> </Menu> <StackPanel Margin="0,8,0,0"> <Button x:Name="Show2EventBased" Margin="10,2,10,2" Click="OnShow2" Content="Show2 via WPF Event"/> <Button x:Name="Show2Command" Command="{x:Static w:TestDespatchWindow.cmdShow2}" Margin="10,2,10,2" Content="Show2 via WPF"/> <Button x:Name="Show2IndirectCommand" Margin="10,2,10,2" Content="Show2 via DLL" />

  4. publicpartialclassWindowWithCommandVM : Window { publicWindowWithCommandVM() { InitializeComponent(); mBackend = newBackedCommandViewModel( "Fred Nerk", "10 Bloggs Ave\nToon Town", true); ... DataContext = mBackend; NameEntry.SetBinding( TextBox.TextProperty, newBinding("Name") {Mode = BindingMode.TwoWay} ); ... CNTL_Lower.Command = mBackend.cmdLower; CommandBindings.Add( newCommandBinding(mBackend.cmdLower, mBackend.CommandSingleEntryPoint) );

  5. publicrefclassBackedCommandViewModel : publicINotifyPropertyChanged { public: BackedCommandViewModel( String^ _name, String^ _address); ... voidCommandSingleEntryPoint( Object^ sender, ExecutedRoutedEventArgs^ e); property String^ Name { String^ get(); void set(String^ s); }; property String^ Address { String^ get();... propertyRoutedCommand^ cmdLower { RoutedCommand^ get(); };... virtualeventPropertyChangedEventHandler^ PropertyChanged; private: voidOnPropertyChanged(String^ name) { PropertyChanged(this, gcnewPropertyChangedEventArgs(name)); }

  6. Lessons Learned • Don’t fight C# - do hookups of properties and commands in code-behind files. • C++/CLI can define straightforward Property objects, events, delegates and commands. • Debugging all the way works if you tell your app it should debug unmanaged code. • Beware of #includes in C++/CLI – use referenced assemblies

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