Question

我有以下代码。

我的TreeViewItem：

class ComponenteNodoViewModel : BaseViewModel
{
    public string Nombre { get; set; }
    private List<ComponenteNodoViewModel> _children;
    private bool _isExpanded;
    private bool _isSelected;


    public ComponenteNodoViewModel Parent { get; set; }


    public bool IsExpanded
    {
        get { return _isExpanded; }
        set
        {
            _isExpanded = value;
            base.RaisePropertyChangedEvent("IsExpanded");
        }
    }

    public bool IsSelected
    {
        get { return _isSelected; }
        set
        {
            _isSelected = value;
            base.RaisePropertyChangedEvent("IsSelected");
        }
    }


    public List<ComponenteNodoViewModel> Children
    {
        get { return _children; }
        set { _children = value; }
    }

}

我拥有treeView的视图的ViewModel。我在GUI中有更多的元素，也有一些底部等等，但我只把与treeView有关系的代码放在一起。

public List<ComponenteNodoViewModel> ComponenteJerarquia { get; private set; }

...

private void componenteJerarquiaConstruirArbol(List<vComponentesEstructuras> paramNodos)
{

    List<ComponenteNodoViewModel> misNodos = new List<ComponenteNodoViewModel>();

    ComponenteNodoViewModel miNodo = new ComponenteNodoViewModel();
    miNodo.Nombre = "Prueba";
    misNodos.Add(miNodo);
    ComponenteJerarquia = new List<ComponenteNodoViewModel>(misNodos);
}

最后我的观点是：

<UserControl x:Class="GTS.CMMS.Client.Views.ucMaquinasPrincipalView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
             xmlns:cmd="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.WPF4"
             xmlns:ViewModels="clr-namespace:Project.ViewModel"
             mc:Ignorable="d"  d:DesignHeight="800" d:DesignWidth="1000">


    <Grid>
        <Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="232" />
                <ColumnDefinition Width="757" />
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition Height="309*" />
                <RowDefinition Height="350*" />
            </Grid.RowDefinitions>

            <TreeView ItemsSource="{Binding ComponenteJerarquia}" Margin="6,6,8,5" Name="trvComponente" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
                <HierarchicalDataTemplate DataType="{x:Type ViewModels:ComponenteNodoViewModel}" ItemsSource="{Binding Path=Children}">
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Text="{Binding Path=Nombre}"/>
                    </StackPanel>
                </HierarchicalDataTemplate>

                <HierarchicalDataTemplate DataType="{x:Type ViewModels:ComponenteNodoViewModel}">
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Text="{Binding Path=Nombre}"/>
                    </StackPanel>
                </HierarchicalDataTemplate>         
            </TreeView>                    
        </Grid>
    </Grid>
</UserControl>

问题在于，当我调用componenteJerarquiaConstruirArbol方法时，不会填充树视图。

我认为问题是绑定，但我看不出问题。

Answer 1

属性ComponenteJerarquia只是一个普通属性，因此当您设置它时，绑定系统不会被通知它需要更新绑定。您需要在该类中实现INotifyPropertyChanged并在setter中引发PropertyChanged事件。

好吧，另一部分是你不应该将你的HierarchicalDataTemplates放在TreeView中 - 这使得它认为你正试图将它们放在实际的树中。而是将这些模板移到您的资源中。

treeview和mvvm我没有填充树视图

1 个答案: