WPF CheckedListbox-如何获取所选项目 [英] Wpf CheckedListbox - how to get selected item

问题描述

我使用以下代码在xaml中创建了CheckedListbox:

I've made a CheckedListbox in xaml using this code:

                    <ListBox Height="340" ItemsSource="{Binding Sections}" SelectedItem="{Binding SelectedSection}">
                    <ListBox.ItemTemplate>
                        <DataTemplate>
                            <CheckBox IsChecked="{Binding IsChecked}" Content="{Binding Path=Item}" />
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>

及其绑定到此集合:

public ObservableCollection<CheckedListItem<String>> Sections { get; set; }
private CheckedListItem<String> _selectedSection;
public CheckedListItem<String> SelectedSection
    {
        get { return _selectedSection; }
        set 
        {
            _selectedSection = value; 
            RaisePropertyChanged("SelectedSection"); 
        }
    }

CheckedListItem类如下:

The CheckedListItem class looks like this:

    public class CheckedListItem<T> : INotifyPropertyChanged
    {
    public event PropertyChangedEventHandler PropertyChanged;

    private bool isChecked;
    private T item;

    public CheckedListItem()
    { }

    public CheckedListItem(T item, bool isChecked = false)
    {
        this.item = item;
        this.isChecked = isChecked;
    }

    public T Item
    {
        get { return item; }
        set
        {
            item = value;
            if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("Item"));
        }
    }


    public bool IsChecked
    {
        get { return isChecked; }
        set
        {
            isChecked = value;
            if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("IsChecked"));
        }
    }
}

我试图在_selectedSection =值中设置一个断点；代码的一部分，但是当我在CheckedListBox中选择/取消选择一个项目时，它永远不会触发.

I tried to set a breakpoint in the _selectedSection = value; part of the code but it never gets triggered when i select/deselect an item in the CheckedListBox.

我的问题是，每次选择/取消选择时如何获取所选项目?

My question is how can I get the selected item every time its selected/deselected ?

谢谢

推荐答案

将您的 XAML 更改为

<ListBox Height="340" ItemsSource="{Binding Sections}" SelectedItem="{Binding SelectedSection}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <ListBoxItem IsSelected="{Binding IsChecked}">
                <CheckBox IsChecked="{Binding IsChecked}" Content="{Binding Path=Item}" />
            </ListBoxItem>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

您可能在复选框或 square 控件中单击实际的 textblock 控件，而这些控件不会触发 selectionchanged 以获得 listbox .如果您尝试在矩形的边界之外单击，请说 whitespace ，它将触发.

You are probably clicking on the actual textblock control inside the checkbox or the square control which doesn't trigger selectionchanged for a listbox. If you try to click outside the bounds of the rectangle say the whitespace then it will fire.

如果您只想将复选框作为数据模板，则将需要做更多的工作，因为您要基于复选框选择/取消选择 listboxitem ' IsChecked 属性.因此，只需将其包装在 ListBoxItem 中，您应该会很好.

It'll be more work if you just want the checkbox as the datatemplate since you want to select/deselect listboxitem' based on the checkbox IsChecked property. So just wrap it inside a ListBoxItem and you should be good to go.

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