WPF TreeView HierarchicalDataTemplate

2021-04-09 22:27

阅读:477

 
StackPanel Margin="0,0,0,0">
            StackPanel.Resources>
                HierarchicalDataTemplate x:Key="MonTemp" DataType = "{x:Type local:MonthViewModel}" ItemsSource = "{Binding FileInfoViewModels}">
                    TextBlock Text="{Binding MonthDescription}"/>
                    HierarchicalDataTemplate.ItemTemplate>
                        DataTemplate DataType="{x:Type local:FileInfoViewModel}">
                            TextBlock Text="{Binding FileName}"/>
                        DataTemplate>
                    HierarchicalDataTemplate.ItemTemplate>
                HierarchicalDataTemplate>

                HierarchicalDataTemplate x:Key="YearTemp" DataType = "{x:Type local:YearViewModel}" ItemsSource = "{Binding MonthViewModels}" ItemTemplate="{StaticResource MonTemp}">
                    TextBlock Text="{Binding YearDescription}"/>
                HierarchicalDataTemplate>
            StackPanel.Resources>

            TreeView Height="100" Name="fileTree">
                TreeView.Resources>
                    Style TargetType="{x:Type TreeViewItem}">
                        Setter Property="IsExpanded" Value="True"/>
                    Style>
                TreeView.Resources>
                TreeViewItem ItemsSource="{Binding TreeViewModels}" Header="Back up View" ItemTemplate="{StaticResource YearTemp}"/>
            TreeView>
        StackPanel>

 


HierarchicalDataTemplate 的DataType是本层的绑定,而ItemsSource是绑定下层的对象集合,它只能使用两层集合,如MonTemp,如果要用到三层以上,需要两个HierarchicalDataTemplate,用ItemTemplate引用另外一个。

HierarchicalDataTemplate绑定后,子节点都是直接绑定DataSource的Object,并非TreeViewItem,所以要全部默认展开的话,要用TreeView.Resources设置Style.


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