解析WPF绑定层次结构数据的应用详解

在实际项目应用中会存在多种类型的层次结构数据，WPF提供了良好的数据绑定机制。其中运用最频繁的就是ListBox和TreeView控件。

一、ListBox和TreeView控件的区别
1.ListBox显示单层次数据集合，TreeView可以显示单层次和多层次数据集合；
2.通过ListBox在UI层面可以展示良好的数据显示效果，对数据集合可以进行排序、分组、过滤操作；
3.TreeView显示为一个多层次的数据集合为树形结构，通过Templete和Style属性同样可以为其定义良好的数据显示效果；

二、ListBox控件示例
1.ListBox绑定数据进行分组：
使用ListBox.GridStyle标签，定义HeaderTemplate属性用来定义组头的外观：

复制代码 代码如下:

代码
 <ListBox ItemSource="{Binding Path=Data}">
  <ListBox.GridStyle>
      <GroupStyle.HeaderTemplate>
           <DataTemplate>
                 <Stackpanel>
                          <Image Source="xxx.jpg"/>
                           <Label Content="C:"/>
                  <Stackpanel>
           </DataTemplate>
      </GroupStyle.HeaderTemplate>
  </ListBox.GridStyle>
 ......
  </ListBox>

复制代码 代码如下:

public List<Groups> groups = new List<Groups>();groups.Add(new Group);........

复制代码 代码如下:

public class Group {
        public int Id { get; set; }
        public string Name { get; set; }
        private List<Box> boxes = new List<Box>();
        public List<Box> Boxes {
            get { return boxes; }
        }
    }

复制代码 代码如下:

代码
 <TreeView x:Name="maintree" FocusVisualStyle="{x:Null}" ItemsSource="{Binding Groups}">
             <TreeView.ItemContainerStyle>
                 <Style TargetType="{x:Type TreeViewItem}">
                     <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
                     <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
                     <Setter Property="FontWeight" Value="Normal" />
                     <Style.Triggers>
                         <Trigger Property="IsSelected" Value="True">
                             <Setter Property="FontWeight" Value="Bold"/>
                         </Trigger>
                     </Style.Triggers>
                 </Style>
             </TreeView.ItemContainerStyle>
             <TreeView.Resources>
                 <HierarchicalDataTemplate DataType="{x:Type m:GroupVO}" ItemsSource="{Binding Boxes}">
                     <StackPanel Orientation="Horizontal">
                         <Label Content="{Binding Path=FriendlyName}"></Label>
                         <CheckBox VerticalAlignment="Center" IsChecked="{Binding Path=IsSelected}"></CheckBox>
                     </StackPanel>                
                 </HierarchicalDataTemplate>              

                 <DataTemplate DataType="{x:Type m:BoxVO}">
                     <Grid Margin="0,5,5,10" MouseDown="maintree_MouseDown" Loaded="Grid_Loaded">
                         <Grid.RowDefinitions>
                             <RowDefinition></RowDefinition>
                         </Grid.RowDefinitions>
                         <Grid.ColumnDefinitions>
                             <ColumnDefinition></ColumnDefinition>
                             <ColumnDefinition></ColumnDefinition>
                         </Grid.ColumnDefinitions>
                         <Image Source="/Resources/Images/shgbit.png" VerticalAlignment="Top" Grid.Column="0" Grid.Row="0"></Image>
                             <Label Grid.RowSpan="2" Grid.Row="0" Grid.Column="0" Margin="5,5,0,0" Content="{Binding Path=FriendlyName}"></Label>
                 </DataTemplate>
             </TreeView.Resources>
         </TreeView>