有关Silverlight TreeView组件的研究

说明：通过学习Silverlight TreeView组件及其子组件TreeViewItem，您将了解到该组件能够以树状列表方式显示层次数据。在实际开发中，其常被用作导航栏、目录表等。

一、基本特性：

[TreeView]

组件所在命名空间：

System.Windows.Controls

组件常用属性：

SelectedItem：获取在TreeView组件中被选中的项目。

SelectedValue：获取由SelectedValuePath属性具体指定的SelectedItem的属性值。

SelectedValuePath：获取或设置在TreeView组件中用于得到SelectedItem属性的属性值的路径。

组件常用事件：

SelectedItemChanged：当SelectedItem的属性值发生改变时发生。

[TreeViewItem]

组件所在命名空间：

System.Windows.Controls

组件常用属性：

IsExpanded：获取或设置一个值来判断包含在TreeViewItem中的项目是否展开或闭合。

IsSelected：获取或设置一个值来判断TreeViewItem是否被选中。

IsSelectionActive：获取一个值来判断TreeViewItem是否取得焦点。

组件常用事件：

Selected：当TreeViewItem的IsSelected属性值由false转为true改变时发生。

Unselected：当TreeViewItem的IsSelected属性值由true转为false改变时发生。

实例1——静态TreeView：

效果图：

说明：需要掌握TreeViewItem的嵌套，以便构筑复杂的层次数据。

代码段：

MainPage.xaml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"

    mc:Ignorable="d" xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls" x:Class="SilverlightClient.MainPage"

    Width="640" Height="480">

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

        <controls:TreeView x:Name="tvEmployee" HorizontalAlignment="Left" Margin="8,8,0,0" Width="184" Height="220" VerticalAlignment="Top" FontSize="14">

            <controls:TreeViewItem Header="层次一">

                <controls:TreeViewItem Header="1.1">

                    <controls:TreeViewItem Header="1.1.1" />

                    <controls:TreeViewItem Header="1.1.2" />

                </controls:TreeViewItem>

                <controls:TreeViewItem Header="1.2" />

                <controls:TreeViewItem Header="1.3" />

            </controls:TreeViewItem>

            <controls:TreeViewItem Header="层次二">

                <controls:TreeViewItem Header="2.1" />

                <controls:TreeViewItem Header="2.2">

                    <controls:TreeViewItem Header="2.2.1">

                        <controls:TreeViewItem Header="2.2.1.1" />

                        <controls:TreeViewItem Header="2.2.1.2" />

                    </controls:TreeViewItem>

                    <controls:TreeViewItem Header="2.2.2" />

                </controls:TreeViewItem>

                <controls:TreeViewItem Header="2.3" />

            </controls:TreeViewItem>

            <controls:TreeViewItem Header="层次三">

                <controls:TreeViewItem Header="3.1" />

            </controls:TreeViewItem>

        </controls:TreeView>

    </Grid>

</UserControl>

 

MainPage.xaml.cs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();

        }

    }

}

实例2——动态TreeView

效果图：

代码段：

MainPage.xaml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"

    mc:Ignorable="d" xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls" x:Class="SilverlightClient.MainPage"

    Width="640" Height="480">

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

        <controls:TreeView x:Name="tvEmployee" HorizontalAlignment="Left" Margin="8,8,0,0" Width="184" Height="220" VerticalAlignment="Top" FontSize="14">

            <controls:TreeViewItem Header="层1"/>

            <controls:TreeViewItem Header="层2"/>

            <controls:TreeViewItem Header="层3"/>

        </controls:TreeView>

        <Button x:Name="btnCreateNode" HorizontalAlignment="Left" Margin="19,0,0,209" Width="159" Content="动态创建结点" Height="29" VerticalAlignment="Bottom" FontSize="16"/>

    </Grid>

</UserControl>

MainPage.xaml.cs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

    {

        int i = 1;

        public MainPage()

        {

            InitializeComponent();

            //注册事件触发处理

            this.btnCreateNode.Click += new RoutedEventHandler(btnCreateNode_Click);

        }

 

        void btnCreateNode_Click(object sender, RoutedEventArgs e)

        {

            if (tvEmployee.SelectedItem != null)

            {

                TreeViewItem tvi = (TreeViewItem)tvEmployee.SelectedItem;//当前选中结点

                TreeViewItem newNode = new TreeViewItem();//新结点

                newNode.Header = "Test" + Convert.ToString(i);

                tvi.Items.Add(newNode);//添加

                i++;

            }

        }

    }

}