我正在尝试在ViewModel中获取选定的TreeView节点
内部Xaml
<Grid>
<TreeView ItemsSource="{Binding TreeViewModel.TreeData}">
<TreeView.Resources>
<HierarchicalDataTemplate ItemsSource="{Binding GroupTables}" DataType="{x:Type tbl:StaticTablesGroup}">
<Label Content="{Binding Name}"/>
</HierarchicalDataTemplate>
<DataTemplate DataType="{x:Type tbl:GroupTable}">
<Label Content="{Binding Name}"/>
</DataTemplate>
</TreeView.Resources>
<TreeView.ItemContainerStyle>
<Style TargetType="TreeViewItem">
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="FontWeight" Value="Bold" />
</Trigger>
</Style.Triggers>
</Style>
</TreeView.ItemContainerStyle>
</TreeView>
</Grid>
内部VieModel
public class TreeTablesViewModel : ViewModelBase
{
private TablesXML _tables;
public TreeTablesViewModel()
{
_tables = Deserialize.GuymasterXml();
}
public List<StaticTablesGroup> TreeData
{
get
{
return _tables.StaticTablesGroups;
}
set
{
_tables.StaticTablesGroups = value;
OnPropertyChanged("TreeData");
}
}
}
最后是数据类
[XmlRoot("Tables")]
public class TablesXML
{
public TablesXML()
{
StaticTablesGroups = new List<StaticTablesGroup>();
}
[XmlArray("StaticGroups")]
[XmlArrayItem("StaticGroup", typeof(StaticTablesGroup))]
public List<StaticTablesGroup> StaticTablesGroups { get; set; }
}
public class StaticTablesGroup
{
public StaticTablesGroup()
{
GroupTables = new List<GroupTable>();
}
[XmlAttribute("Name")]
public string Name { get; set; }
//[XmlArray("StaticGroup")]
[XmlElement("Table", typeof(GroupTable))]
public List<GroupTable> GroupTables { get; set; }
}
public class GroupTable
{
[XmlElement("TableName")]
public string Name { get; set; }
[XmlElement("TableTag")]
public string Tag { get; set; }
private bool _isSelected;
public bool IsSelected
{
get { return _isSelected; }
set
{
if (_isSelected != value)
{
_isSelected = value;
}
}
}
}
选择Treeview节点后，将在GroupTable或StaticTablesGroup内部引发IsSelected。如何获取TreeTablesViewModel中的选定节点？
谢谢
您不应尝试在视图模型内操作视图对象（TreeView，TreeViewItem，TreeNode等）。您查看模型必须仅操作业务/ poco对象。
如果要检索与所选可视对象（TreeViewItem或节点）相对应的基础业务对象，则可以使用以下行为：
public class TreeviewSelectedItemTracker
{
public static TreeTablesViewModel GetSelectedItemHolder(DependencyObject obj)
{
return (TreeTablesViewModel)obj.GetValue(SelectedItemHolderProperty);
}
public static void SetSelectedItemHolder(DependencyObject obj, TreeTablesViewModel value)
{
obj.SetValue(SelectedItemHolderProperty, value);
}
public static readonly DependencyProperty SelectedItemHolderProperty =
DependencyProperty.RegisterAttached("SelectedItemHolder", typeof(TreeTablesViewModel), typeof(TreeviewSelectedItemTracker), new PropertyMetadata(null, OnSelectedChanged));
private static void OnSelectedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
TreeView tv = (TreeView)d;
tv.Loaded += Tv_Loaded;
}
private static void Tv_Loaded(object sender, RoutedEventArgs e)
{
TreeView tv = (TreeView)sender;
tv.Loaded -= Tv_Loaded;
tv.Unloaded += Tv_Unloaded;
tv.SelectedItemChanged += Tv_SelectedItemChanged;
}
private static void Tv_Unloaded(object sender, RoutedEventArgs e)
{
TreeView tv = (TreeView)sender;
tv.Unloaded -= Tv_Unloaded;
tv.SelectedItemChanged -= Tv_SelectedItemChanged;
}
private static void Tv_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
TreeView tv = (TreeView)sender;
var cotr = GetSelectedItemHolder(tv);
cotr.SelectedItem = tv.SelectedItem;
}
}
将TreeView.SelectedItem直接返回与选择相关的业务对象TreeviewItem。
在xaml中，使用附加属性将绑定SelectedItemHolder到您的视图模型
<TreeView ItemsSource="{Binding TreeViewModel.TreeData}" local:TreeviewSelectedItemTracker.SelectedItemHolder="{Binding}"/>
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