如何绑在一个视图模型

Question

我有一些领域视图模型，即

 
type ViewModel = 
    member x.a = [1;2;3] 
    member x.b = [4;5;6] 
    member x.c = [7] 

，并在WPF应用程序中的一些控件放置一些看法，如：

<Control.Resources> 
        <DataTemplate x:Key="ItemTempl"> 
         <TextBlock Text="{Binding}" /> 
        </DataTemplate> 

        <DataTemplate x:Key="SomeTempl"> 
         <ListBox ItemsSource="{Binding}" 
           ItemTemplate="{StaticResource ItemTempl}" /> 
        </DataTemplate> 
       </Control.Resources> 

       <StackPanel> 
        <TabControl x:Name="ListBoxViewPresenter"> 
         <TabItem Header="vm.a" Content="{Binding vm.a}" 
          ContentTemplate="{StaticResource SomeTempl}"/> 
         <TabItem Header="vm.b" Content="{Binding vm.b}" 
          ContentTemplate="{StaticResource SomeTempl}"/> 
         <TabItem Header="vm.c" Content="{Binding vm.c}" 
          ContentTemplate="{StaticResource SomeTempl}"/> 
        </TabControl> 
        <ListBox x:Name="ListBoxViewPresenter"> 
         <ListBoxItem Content="{Binding vm.a}" 
            ContentTemplate="{StaticResource SomeTempl}" /> 
         <ListBoxItem Content="{Binding vm.b}" 
            ContentTemplate="{StaticResource SomeTempl}" /> 
         <ListBoxItem Content="{Binding vm.c}" 
            ContentTemplate="{StaticResource SomeTempl}" /> 
        </ListBox> 
       </StackPanel> 

我应该怎么办要实现这样的行为： 当您单击ListBoxViewPresenter中的vm.a/b/c中的某个元素时，必须在相应的TabItem中选择ListBoxViewPresenter中的相同元素。

UPD： 具体来说，我真正的问题，从原点主题改变。

我有ViewModel的字段：onelines，twolines ...和一个名为selected_scheme的字段。 在XAML：

<TreeViewItem Header="{Binding Path=name}" x:Name="ProjectArea"> 
        <TreeViewItem Header="Однониточные планы" Style="{StaticResource MyTreeViewItem}"> 
         <ContentPresenter Content="{Binding onelines}" ContentTemplate="{StaticResource SchemeWrapperTemplate}" /> 
        </TreeViewItem> 
        <TreeViewItem Header="Двухниточные планы" Style="{StaticResource MyTreeViewItem}"> 
         <ContentPresenter Content="{Binding twolines}" ContentTemplate="{StaticResource SchemeWrapperTemplate}" /> 
        </TreeViewItem> 

和数据模板：

  <DataTemplate x:Key="SchemeWrapperTemplate"> 
      <ListBox ItemsSource="{Binding schemes}" 
        ItemTemplate="{StaticResource SchemeTemplate}" 
        SelectedItem="{Binding selected_scheme}"> 
       <ListBox.Style> 

在其他地方的程序：

<Grid Grid.Row="1"> 
        <TextBlock Text="{Binding selected_scheme.path}" /> 
       </Grid> 

当你点击一些列表框，如果你再选择的项目不改变点击一个SelectedItems。

Answer 1

您编辑后的新的答案：

它确实没有将同一对象绑定到包含不同元素的两个不同列表的SelectedItem属性上意义重大。你必须重新设计你的应用程序，否则你可能会遇到很多问题，因为这个奇怪的设计在未来。

尽管如此，你仍然可以通过一点点代码实现想要的目标。当用户单击某个ListBox时，将其他列表框的选定项目设置为null。然后，当你重新点击第一个列表框时，你会收到通知，因为选择从空到某些东西。

XAML：

<Window x:Class="WpfApplication13.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     Title="MainWindow" Height="350" Width="525"> 
    <Grid> 
     <StackPanel> 
      <ListBox x:Name="ListBoxViewPresenter" 
        SelectedItem="{Binding CurrentlySelectedItem}" 
        ItemsSource="{Binding MyItemsSource}" /> 
      <ListBox x:Name="ListBoxViewPresenter2" 
        SelectedItem="{Binding CurrentlySelectedItem}" 
        ItemsSource="{Binding MyItemsSource2}" /> 
     </StackPanel> 
    </Grid> 
</Window> 

代码隐藏：

using System.Collections.Generic; 
using System.Windows; 
using System.Windows.Input; 
using System.ComponentModel; 

namespace WpfApplication13 
{ 
    /// <summary> 
    /// Interaction logic for MainWindow.xaml 
    /// </summary> 
    public partial class MainWindow : Window, INotifyPropertyChanged 
    { 
     #region INotifyPropertyChanged Members 

     public event PropertyChangedEventHandler PropertyChanged; 

     #endregion 

     private object _currentlySelectedItem; 

     public object CurrentlySelectedItem 
     { 
      get { return _currentlySelectedItem; } 

      set 
      { 
       _currentlySelectedItem = value; 

       if (this.PropertyChanged != null) 
       { 
        this.PropertyChanged(this, new PropertyChangedEventArgs("CurrentlySelectedItem")); 
       } 
      } 
     } 

     private List<int> _myItemsSource = new List<int> { 1, 2 }; 

     private List<int> _myItemsSource2 = new List<int> { 3, 4 }; 

     public List<int> MyItemsSource 
     { 
      get { return _myItemsSource; } 
      set { _myItemsSource = value; } 
     } 


     public List<int> MyItemsSource2 
     { 
      get { return _myItemsSource2; } 
      set { _myItemsSource2 = value; } 
     } 

     public MainWindow() 
     { 
      InitializeComponent(); 

      this.DataContext = this; 

      ListBoxViewPresenter.PreviewMouseDown += ListBoxViewPresenter_PreviewMouseDown; 
      ListBoxViewPresenter2.PreviewMouseDown += ListBoxViewPresenter2_PreviewMouseDown; 
     } 

     void ListBoxViewPresenter_PreviewMouseDown(object sender, MouseButtonEventArgs e) 
     { 
      ListBoxViewPresenter2.SelectedItem = null; 
     } 

     void ListBoxViewPresenter2_PreviewMouseDown(object sender, MouseButtonEventArgs e) 
     { 
      ListBoxViewPresenter.SelectedItem = null; 
     } 
    } 
} 

Answer 2

首先，您应该在ViewModel中定义您的TabItem和ListBox的ItemsSource，它们也绑定。 然后，您可以将其SelectedItem绑定到ViewModel中的属性。

下面是一个代码示例（我是懒得来创建一个单独的ViewModel类，因此它与我的主窗口类混合，但你的想法...）：

代码隐藏：

namespace WpfApplication13 
{ 
    public partial class MainWindow : Window, INotifyPropertyChanged 
    { 
     public event PropertyChangedEventHandler PropertyChanged; 

     private object _currentlySelectedItem; 

     public object CurrentlySelectedItem 
     { 
      get { return _currentlySelectedItem; } 

      set 
      { 
       _currentlySelectedItem = value; 

       if (this.PropertyChanged != null) 
       { 
        this.PropertyChanged(this, new PropertyChangedEventArgs("CurrentlySelectedItem")); 
       } 
      } 
     } 

     public class MyClass 
     { 
      public string MyString { get; set; } 

      public MyClass(string myString) 
      { 
       this.MyString = myString; 
      } 
     } 

     private List<MyClass> _myItemsSource = new List<MyClass> 
               { 
                new MyClass("toto"), 
                new MyClass("tata") 
               }; 

     public List<MyClass> MyItemsSource 
     { 
      get { return _myItemsSource; } 
      set { _myItemsSource = value; } 
     } 

     public object A 
     { 
      get { return "toto"; } 
     } 

     public object B 
     { 
      get { return "tata"; } 
     } 

     public MainWindow() 
     { 
      InitializeComponent(); 

      this.DataContext = this; 
     } 
    } 
} 

XAML：

<Window x:Class="WpfApplication13.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     Title="MainWindow" Height="350" Width="525"> 
    <Grid> 
     <StackPanel> 
      <TabControl x:Name="ListBoxViewPresenter" 
         SelectedItem="{Binding CurrentlySelectedItem}" 
         ItemsSource="{Binding MyItemsSource}" /> 
      <ListBox x:Name="ListBoxViewPresenter2" 
        SelectedItem="{Binding CurrentlySelectedItem}" 
        ItemsSource="{Binding MyItemsSource}" /> 
     </StackPanel> 
    </Grid> 
</Window>