如何在 WPF CheckBox ListBox 中获取所选项目 [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

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>

我试图遍历 listboxitems 中的选定项目，但它在 listboxitem 中抛出异常

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());
            }
        }
    }

推荐答案

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

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 */
}

然后在你的 ListBox ItemTemplate

Then in your ListBox ItemTemplate

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

您选择的项目现在在 ObservableCollection 中可用，而不是在 UI 元素中循环

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

这篇关于如何在 WPF CheckBox ListBox 中获取所选项目的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！