如何获取选择项目在WPF CheckBox ListBox [英] How to get Selected items in WPF CheckBox ListBox

问题描述

Am使用列表框项中的复选框，如何从列表中获取选中的复选框

 < ListBox ItemsSource = {Binding NameList}Horizo​​ntalAlignment =LeftMargin =16,68,0,12Name =listBox1Width =156IsEnabled =TrueSelectionMode =MultipleFocusable =TrueIsHitTestVisible =True IsTextSearchEnabled =FalseFontSize =12Padding =5SelectionChanged =listBox1_SelectionChanged> 
< ListBox.ItemTemplate> 
< DataTemplate> 
< StackPanel Orientation =Horizo​​ntal> 
< CheckBox Content ={Binding Path = CNames}/> 
< / StackPanel> 
< / DataTemplate> 
< /ListBox.ItemTemplate> 
< / ListBox> 
 

我尝试循环遍历listboxitems中的选定项目，但它在listboxitem中抛出异常

  private void btnSelected（object sender，RoutedEventArgs e）
 {
 foreach（listBox1.Items中的ListBoxItem项）
 {
 if（item.ToString（）==true）
 {
 MessageBox.Show（item.Content.ToString（））; 
} 
} 
} 
  




解决方案>

您可以将每个项目的数据上下文从UI移开，并创建一个对象的ObservableCollection

  public ObservedCollection< CheckedItem> List {get; set;} 
 
 public class CheckedItem：INotifyPropertyChanged 
 {
 private bool selected; 
 private string description; 
 
 public bool选择
 {
 get {return selected; } 
 set 
 {
 selected = value; 
 OnPropertyChanged（Selected）; 
} 
} 
 
 public string描述
 {
 get {return description; } 
 set 
 {
 description = value; 
 OnPropertyChanged（Description）; 
} 
} 
 
 / * INotifyPropertyChanged实现* / 
} 
  

然后在您的ListBox ItemTemplate中

 < ItemTemplate> 
< DataTemplate> 
< CheckBox IsChecked ={Binding Path = Selected}
 Content = {Binding Path = Description}/> 
< / DataTemplate> 
< / ItemTemplate> ; 
  

您选择的项目现在可在ObservableCollection中使用，而不是循环使用UI元素

Am Using the checkbox in listbox items, how to get the selected checkboxes from the list

<ListBox ItemsSource="{Binding NameList}"  HorizontalAlignment="Left" Margin="16,68,0,12" Name="listBox1" Width="156" IsEnabled="True" SelectionMode="Multiple" Focusable="True" IsHitTestVisible="True" IsTextSearchEnabled="False" FontSize="12" Padding="5" SelectionChanged="listBox1_SelectionChanged">
            <ListBox.ItemTemplate>
                <DataTemplate> 
                        <StackPanel Orientation="Horizontal">                      
                               <CheckBox Content="{Binding Path=CNames}" />
                        </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

I tried to loop thru the selected items in the listboxitems, but it throws exception in listboxitem

 private void btnSelected(object sender, RoutedEventArgs e)
    {
        foreach (ListBoxItem item in listBox1.Items)
        {
            if (item.ToString() == "true")
            {
                MessageBox.Show(item.Content.ToString());
            }
        }
    }

解决方案

You could move the data context for each of these items away from the UI and create an ObservableCollection of objects

public ObservableCollection<CheckedItem> List { get;set;}

public class CheckedItem : INotifyPropertyChanged
{
  private bool selected;
  private string description;

  public bool Selected 
  { 
     get { return selected; }
     set 
     {
        selected = value;
        OnPropertyChanged("Selected");
     }
  }

  public string Description 
  { 
     get { return description; }
     set
     {
         description = value;
         OnPropertyChanged("Description");
     }
   }

  /* INotifyPropertyChanged implementation */
}

Then in your ListBox ItemTemplate

<ItemTemplate>
  <DataTemplate>
    <CheckBox IsChecked="{Binding Path=Selected}" 
              Content={Binding Path=Description}" />
  </DataTemplate>
</ItemTemplate>

Your selected items are now available in the ObservableCollection rather than looping through UI elements

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