在列表视图中绑定到WPF组合框（2路）

Question

我有这个问题，必须绑定列表视图中嵌入的组合框的选定值。我在显示组合框中的项目时没有问题。但是，我希望我能够通过单击按钮来指定组合框应该显示的内容（从它保存的项目中）。我认为在这个问题上有几个帖子，但是，我无法得到我想要的。这是我的代码。

XAML：

<Grid> 
    <StackPanel Orientation="Vertical"> 
    <ListView 
     x:Name="OptionsListView" 
     ItemsSource="{Binding MyObjectCollection}"> 
     <ListView.Resources> 
      <DataTemplate x:Key="comboBoxTemplate"> 
       <ComboBox 
         Margin="0,3" 
         x:Name="MyTypeComboBox" 
         SelectedValue="{Binding Path=SelectedType, Mode=TwoWay}"> 
        <ComboBoxItem Content="ABC"/> 
        <ComboBoxItem Content="DEF"/> 
        <ComboBoxItem Content="XYZ"/> 
       </ComboBox> 
      </DataTemplate> 
     </ListView.Resources> 
     <ListView.View> 

      <GridView> 
       <GridViewColumn Header="Text-Sample" 
            Width="100"> 
        <GridViewColumn.CellTemplate> 
         <DataTemplate> 
          <TextBlock Text="{Binding Name}"/> 
         </DataTemplate> 
        </GridViewColumn.CellTemplate> 
       </GridViewColumn> 
       <GridViewColumn Header="Combo-Sample" 
            Width="100" 
            CellTemplate="{StaticResource comboBoxTemplate}" /> 
      </GridView> 
     </ListView.View> 
    </ListView> 
    <Button Click="Button_Click">Click Me!</Button> 
    </StackPanel> 
</Grid> 

C＃代码背后：

public partial class MainWindow : Window 
{ 
    public MainWindow() 
    { 
     InitializeComponent(); 
     OptionsListView.DataContext = this; 
    } 

    private void Button_Click(object sender, RoutedEventArgs e) 
    { 
     //Something here that dictates what should be displayed in the combo box 
    } 

    List<MyObject> myObjectCollection = new List<MyObject>(); 
    public List<MyObject> MyObjectCollection 
    { 
     get 
     { 
      myObjectCollection.Add(new MyObject("One")); 
      myObjectCollection.Add(new MyObject("Two")); 
      return myObjectCollection; 
     } 
    } 

} 

public class MyObject : INotifyPropertyChanged 
{ 
    private string _name; 

    public MyObject(string name) 
    { 
     // TODO: Complete member initialization 
     this._name = name; 
    } 

    public string Name 
    { 
     get 
     { 
      return _name; 
     } 
    } 

    string selectedType = string.Empty; 
    public string SelectedType 
    { 
     get 
     { 
      return selectedType; 
     } 
     set 
     { 
      selectedType = value; 
      this.NotifyChange("SelectedType"); 
     } 
    } 

    #region INotifyPropertyChanged Members 

    public event PropertyChangedEventHandler PropertyChanged; 

    private void NotifyChange(params object[] properties) 
    { 
     if (PropertyChanged != null) 
     { 
      foreach (string p in properties) 
      { 
       PropertyChanged(this, new PropertyChangedEventArgs(p)); 
      } 
     } 
    } 
    #endregion 
} 

我会很高兴，如果有人可以帮我破解这个..

感谢 拉姆

Answer 1

我我不确定我是否误解了你的问题。我认为你的问题是关于参考问题。我稍微改了一下你的代码，点击按钮后它就起作用了。

请参阅下面的代码。

XAML：

<ComboBox Margin="0,3" 
    x:Name="MyTypeComboBox" 
    ItemsSource="{Binding RelativeSource={RelativeSource AncestorType=ListBox},Path=DataContext.Sources}" 
    SelectedValue="{Binding Path=SelectedType, Mode=TwoWay}"> 
</ComboBox> 

C＃代码：

private Collection<string> sources = new Collection<string>() { "ABC", "DEF", "XYZ" }; 
public Collection<string> Sources { get { return sources; } } 

private void Button_Click(object sender, RoutedEventArgs e) 
{ 
    myObjectCollection[0].SelectedType = Sources[0]; 
    myObjectCollection[1].SelectedType = Sources[2]; 
} 

Answer 2

如何

foreach (ComboBox c in OptionsListView.Items) 
      { 
       c.SelectedValue = "Put your value here"; 
      } 

这应该做的工作，如果你有比组合框里面可以添加其他对象

if (c is ComboBox) 

确保您正在处理正确的物体