2.4属性元素
以下c#和xaml是一致的
Rectangle r = new Rectangle();
r.Width = 40;
r.Height = 40;
r.Fill = Brushes.Black;
button.Content = r;
<Button x:Name="button" HorizontalAlignment="Left" Height="120" Margin="81,61,0,0" VerticalAlignment="Top" Width="346" Click="button_Click">
<Button.Content>
<Rectangle Height="40" Width="40" Fill="red">
</Rectangle>
</Button.Content>
</Button>
2.6属性扩展
以下xaml
<Button x:Name="button" Click="button_Click" Background="{x:Null}" Height="{x:Static SystemParameters.IconHeight}" Content="{Binding Path=Height, RelativeSource={RelativeSource Self}}">
和c#等价
button.Background = null;
button.Height = SystemParameters.IconHeight;
System.Windows.Data.Binding binding = new Binding();
binding.Path = new PropertyPath("Height");
binding.RelativeSource = RelativeSource.Self;
button.SetBinding(Button.ContentProperty, binding);
content binding含义：显示在button上的字符串
2.7.2 集合项
<ListBox x:Name="listBox" >
<ListBox.Items>
<ListBoxItem Content="Item 1"></ListBoxItem>
<ListBoxItem Content="Item 2"></ListBoxItem>
</ListBox.Items>
</ListBox>
等价于
System.Windows.Controls.ListBoxItem li1 = new System.Windows.Controls.ListBoxItem();
li1.Content = "Item 1";
listBox.Items.Add(li1);
System.Windows.Controls.ListBoxItem li2 = new System.Windows.Controls.ListBoxItem();
li2.Content = "Item 2";
listBox.Items.Add(li2);
3.2逻辑树与可视树
代码
public MainWindow() { InitializeComponent(); printLogicalTree(0, this); } private void button_Click(object sender, RoutedEventArgs e) { MessageBox.Show("A"); } protected override void OnContentRendered(EventArgs e) { base.OnContentRendered(e); printVisualTree(0, this); } void printLogicalTree(int depth, object obj) { Debug.WriteLine(new string(' ', depth) + obj); if (!(obj is DependencyObject)) return; foreach(object child in LogicalTreeHelper.GetChildren(obj as DependencyObject)) { printLogicalTree(depth + 1, child); } } void printVisualTree(int depth, DependencyObject obj) { Debug.WriteLine(new string(' ', depth) + obj); if (!(obj is DependencyObject)) return; for(int i=0; i< VisualTreeHelper.GetChildrenCount(obj);i++) { printVisualTree(depth + 1, VisualTreeHelper.GetChild(obj,i)); } }输出
WpfApplication1.MainWindow System.Windows.Controls.StackPanel System.Windows.Controls.Label: eeeeeee eeeeeee System.Windows.Controls.Label: Label Label System.Windows.Controls.Label: Label Label System.Windows.Controls.ListBox Items.Count:0 System.Windows.Controls.StackPanel System.Windows.Controls.Button: Button Button System.Windows.Controls.Button: Button Button System.Windows.Controls.Primitives.StatusBar Items.Count:1 xxx “WpfApplication1.vshost.exe”(CLR v4.0.30319: WpfApplication1.vshost.exe): 已加载“C:\windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework-SystemXmlLinq\v4.0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemXmlLinq.dll”。已跳过加载符号。模块进行了优化，并且调试器选项“仅我的代码”已启用。 “WpfApplication1.vshost.exe”(CLR v4.0.30319: WpfApplication1.vshost.exe): 已加载“C:\windows\Microsoft.Net\assembly\GAC_MSIL\PresentationFramework-SystemXml\v4.0_4.0.0.0__b77a5c561934e089\PresentationFramework-SystemXml.dll”。已跳过加载符号。模块进行了优化，并且调试器选项“仅我的代码”已启用。 “WpfApplication1.vshost.exe”(CLR v4.0.30319: WpfApplication1.vshost.exe): 已加载“C:\windows\Microsoft.Net\assembly\GAC_MSIL\PresentationCore.resources\v4.0_4.0.0.0_zh-Hans_31bf3856ad364e35\PresentationCore.resources.dll”。模块已生成，不包含符号。 “WpfApplication1.vshost.exe”(CLR v4.0.30319: WpfApplication1.vshost.exe): 已加载“C:\Users\cutepig\AppData\Local\Temp\VisualStudio.XamlDiagnostics.8476\WpfXamlDiagnosticsTap.dll”。已跳过加载符号。模块进行了优化，并且调试器选项“仅我的代码”已启用。 “WpfApplication1.vshost.exe”(CLR v4.0.30319: WpfApplication1.vshost.exe): 已加载“C:\windows\assembly\GAC\Microsoft.VisualStudio.OLE.Interop\7.1.40304.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.OLE.Interop.dll”。模块已生成，不包含符号。 “WpfApplication1.vshost.exe”(CLR v4.0.30319: WpfApplication1.vshost.exe): 已加载“C:\windows\Microsoft.Net\assembly\GAC_MSIL\UIAutomationTypes\v4.0_4.0.0.0__31bf3856ad364e35\UIAutomationTypes.dll”。已跳过加载符号。模块进行了优化，并且调试器选项“仅我的代码”已启用。 “WpfApplication1.vshost.exe”(CLR v4.0.30319: WpfApplication1.vshost.exe): 已加载“C:\windows\Microsoft.Net\assembly\GAC_MSIL\Accessibility\v4.0_4.0.0.0__b03f5f7f11d50a3a\Accessibility.dll”。无法查找或打开 PDB 文件。 “WpfApplication1.vshost.exe”(CLR v4.0.30319: WpfApplication1.vshost.exe): 已加载“C:\windows\Microsoft.Net\assembly\GAC_MSIL\UIAutomationProvider\v4.0_4.0.0.0__31bf3856ad364e35\UIAutomationProvider.dll”。已跳过加载符号。模块进行了优化，并且调试器选项“仅我的代码”已启用。 WpfApplication1.MainWindow System.Windows.Controls.Border System.Windows.Documents.AdornerDecorator System.Windows.Controls.ContentPresenter System.Windows.Controls.StackPanel System.Windows.Controls.Label: eeeeeee System.Windows.Controls.Border System.Windows.Controls.ContentPresenter System.Windows.Controls.TextBlock System.Windows.Controls.Label: Label System.Windows.Controls.Border System.Windows.Controls.ContentPresenter System.Windows.Controls.TextBlock System.Windows.Controls.Label: Label System.Windows.Controls.Border System.Windows.Controls.ContentPresenter System.Windows.Controls.TextBlock System.Windows.Controls.ListBox Items.Count:0 System.Windows.Controls.Border System.Windows.Controls.ScrollViewer System.Windows.Controls.Grid System.Windows.Shapes.Rectangle System.Windows.Controls.ScrollContentPresenter System.Windows.Controls.ItemsPresenter System.Windows.Controls.VirtualizingStackPanel System.Windows.Documents.AdornerLayer System.Windows.Controls.Primitives.ScrollBar 最小值:0 最大值:0 值:0 System.Windows.Controls.Primitives.ScrollBar 最小值:0 最大值:0 值:0 System.Windows.Controls.StackPanel System.Windows.Controls.Button: Button Microsoft.Windows.Themes.ButtonChrome System.Windows.Controls.ContentPresenter System.Windows.Controls.TextBlock System.Windows.Controls.Button: Button Microsoft.Windows.Themes.ButtonChrome System.Windows.Controls.ContentPresenter System.Windows.Controls.TextBlock System.Windows.Controls.Primitives.StatusBar Items.Count:1 System.Windows.Controls.Border System.Windows.Controls.ItemsPresenter System.Windows.Controls.DockPanel System.Windows.Controls.Primitives.StatusBarItem: xxx System.Windows.Controls.Border System.Windows.Controls.ContentPresenter System.Windows.Controls.TextBlock System.Windows.Documents.AdornerLayer 线程 0xb10 已退出，返回值为 0 (0x0)。
