三、数据绑定与模板样式
说明：通过学习本文内容，您将了解到怎样动态地进行关于TreeView组件的数据绑定以及TreeViewItem组件的模板样式更改。本文给出基本的使用方法。

 

注：在Silverlight项目文件夹下建立Icon文件夹，向里面添加3个16*16的png格式的图像。关于动态数据绑定这里只给出了基本的使用方法，在实际开发中可以使用WebService、XML等进行数据绑定。

效果图：

Feature.cs(业务模型)代码：

using System.Collections.ObjectModel;

using System.ComponentModel;

using System.Windows.Markup;

namespace SilverlightClient

{

[ContentProperty("Subcomponents")] //声明可在XAML文件中显示的内容属性

public class Feature : INotifyPropertyChanged //继承接口INotifyPropertyChanged用于双向数据绑定

{

//Feature对象的属性

public string FeatureName { get; set; }

public string Description { get; set; }

public string Icon { get; set; }//用以添加TreeViewItem项的图标

//声明全局变量

public Collection<Feature> Subcomponents { get; private set; }

private bool? _shouldInstall;

//是否有子组件

public bool HasSubcomponents

{

get

{

return Subcomponents.Count > 0;

}

}

//是否允许Feature进行安置

public bool? ShouldInstall

{

get

{

return _shouldInstall;

}

set

{

if (value != _shouldInstall)

{

_shouldInstall = value;

OnPropertyChanged("ShouldInstall");

}

}

}

//构造函数

public Feature()

{

Subcomponents = new Collection<Feature>();

ShouldInstall = true;

}

//事件委托

public event PropertyChangedEventHandler PropertyChanged;

//实现接口INotifyPropertyChanged定义函数

private void OnPropertyChanged(string propertyName)

{

PropertyChangedEventHandler handler = PropertyChanged;

if (null != handler)

{

handler.Invoke(this, new PropertyChangedEventArgs(propertyName));

}

}

}

}

MainPage.xaml文件代码：

<UserControl

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:toolkit="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Toolkit"

xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"

xmlns:common="clr-namespace:System.Windows;assembly=System.Windows.Controls"

xmlns:samplesCommon="clr-namespace:SilverlightClient"

mc:Ignorable="d" x:Class="SilverlightClient.MainPage"

Width="640" Height="480">

<Grid x:Name="LayoutRoot" Background="White" Width="640" Height="480">

<StackPanel>

<StackPanel.Resources>

<!-- TreeViewItem风格设定 -->

<Style x:Key="PurpleItemStyle" TargetType="controls:TreeViewItem">

<Setter Property="Foreground" Value="Purple" />

<Setter Property="FontWeight" Value="Bold" />

</Style>

<!-- 代表一个Feature项的模板 -->

<common:HierarchicalDataTemplate x:Key="NodeTemplate" ItemsSource="{Binding Subcomponents}" ItemContainerStyle="{StaticResource PurpleItemStyle}">

<StackPanel Orientation="Horizontal" ToolTipService.ToolTip="{Binding Description}">

<Image Source="{Binding Icon}" /><!-- 图标绑定 -->

<ContentPresenter Content=" " />

<ContentPresenter Content="{Binding FeatureName}" />

</StackPanel>

</common:HierarchicalDataTemplate>

</StackPanel.Resources>

<Grid>

<Grid.ColumnDefinitions>

<ColumnDefinition Width="*" />

<ColumnDefinition Width="2*" />

</Grid.ColumnDefinitions>

<controls:TreeView x:Name="tvFeature"

ItemTemplate="{StaticResource NodeTemplate}"

Grid.Column="0"

FontSize="14">

<!-- 用来一次展开TreeView所有结点 -->

<controls:TreeView.ItemContainerStyle>

<Style TargetType="controls:TreeViewItem">

<Setter Property="IsExpanded" Value="True" />

</Style>

</controls:TreeView.ItemContainerStyle>

</controls:TreeView>

</Grid>

</StackPanel>

</Grid>

</UserControl>

MainPage.xaml.cs文件代码：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

namespace SilverlightClient

{

public partial class MainPage : UserControl

{

public MainPage()

{

InitializeComponent();

this.Loaded += new RoutedEventHandler(MainPage_Loaded);

}

void MainPage_Loaded(object sender, RoutedEventArgs e)

{

Feature ft = new Feature();

Feature ftRoot = new Feature();

ftRoot.FeatureName = "公司部门";

ftRoot.Description = "公司各部门的结构";

ftRoot.Icon = "Icon/l1.png";

Feature ftChild1 = new Feature();

ftChild1.FeatureName = "建筑部";

ftChild1.Description = "负责公司的工程项目";

ftChild1.Icon = "Icon/l2.png";

Feature ftChild1_1 = new Feature();

ftChild1_1.FeatureName = "设计科";

ftChild1_1.Description = "负责项目的设计";

ftChild1_1.Icon = "Icon/l3.png";

Feature ftChild1_2 = new Feature();

ftChild1_2.FeatureName = "工程科";

ftChild1_2.Description = "负责项目的具体实施";

ftChild1_2.Icon = "Icon/l3.png";

ftChild1.Subcomponents.Add(ftChild1_1);

ftChild1.Subcomponents.Add(ftChild1_2);

Feature ftChild2 = new Feature();

ftChild2.FeatureName = "管理部";

ftChild2.Description = "负责管理公司的财务与人事";

ftChild2.Icon = "Icon/l2.png";

Feature ftChild2_1 = new Feature();

ftChild2_1.FeatureName = "财务科";

ftChild2_1.Description = "负责公司的对内对外的财务事宜";

ftChild2_1.Icon = "Icon/l3.png";

Feature ftChild2_2 = new Feature();

ftChild2_2.FeatureName = "总务人事科";

ftChild2_2.Description = "负责公司日常事务及员工招聘";

ftChild2_2.Icon = "Icon/l3.png";

ftChild2.Subcomponents.Add(ftChild2_1);

ftChild2.Subcomponents.Add(ftChild2_2);

ftRoot.Subcomponents.Add(ftChild1);

ftRoot.Subcomponents.Add(ftChild2);

ft.Subcomponents.Add(ftRoot);

tvFeature.ItemsSource = ft.Subcomponents;

}

}