“绑定/触发”；选择全部"-WPF中的复选框ComboBoxItem

我试图创建一个WPF CustomControl复选框，除了用户定义的项目列表之外，还包含一个“全选”项目。选择“全选”时，应相应地检查列表中的所有项目。我如何处理正在单击的“全选”项目？我尝试了很多方法，但是CheckComboBox.cs中的属性“SelectAll”从未被输入

这是我当前的代码

Generic.xaml

<Style TargetType="{x:Type local:CheckComboBox}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type local:CheckComboBox}">
                    <ComboBox SelectedItem="{TemplateBinding SelectedItem}"
                              SelectedValue="{TemplateBinding SelectedValue}"
                              SelectedValuePath="{TemplateBinding SelectedValuePath}"
                              DisplayMemberPath="{TemplateBinding DisplayMemberPath}"
                              IsTextSearchEnabled="{TemplateBinding IsTextSearchEnabled}"
                              ItemTemplate="{TemplateBinding ItemTemplate}"
                              x:Name="InnerComboBox" >

                        <ComboBox.Resources>
                            <ResourceDictionary>
                                <CheckBox x:Key="allItem" Content="All" IsChecked="{Binding SelectAll, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}" />
                                <CollectionViewSource x:Key="items" Source="{Binding ComboBoxItems, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}" />
                            </ResourceDictionary>
                        </ComboBox.Resources>

                        <ComboBox.ItemsSource>
                            <CompositeCollection>
                                <ComboBoxItem Content="{Binding Source={StaticResource allItem}}"/>
                                <CollectionContainer Collection="{Binding Source={StaticResource items}}" />
                            </CompositeCollection>
                        </ComboBox.ItemsSource>

                    </ComboBox>

                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="ItemTemplate">
            <Setter.Value>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <CheckBox IsChecked="{Binding IsSelected}" Content="{Binding Text}" VerticalAlignment="Center" />
                    </StackPanel>
                </DataTemplate>
            </Setter.Value>
        </Setter>
    </Style>

---

终于找到了触发“SelectAll”属性的方法。请注意：

<ComboBoxItem>
    <CheckBox ... />
</ComboBoxItem>

Generic.xaml

...
<ComboBox.Resources>
    <ResourceDictionary>
        <CollectionViewSource x:Key="items" Source="{Binding ItemsSource, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}" />
    </ResourceDictionary>
</ComboBox.Resources>

<ComboBox.ItemsSource>
    <CompositeCollection>
        <ComboBoxItem>
            <CheckBox Content="All" IsChecked="{Binding SelectAll, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}" />
        </ComboBoxItem>
        <CollectionContainer Collection="{Binding Source={StaticResource items}}" />
    </CompositeCollection>
</ComboBox.ItemsSource>
...

。。。
...

选中ComboBox.cs

public class CheckComboBox : ComboBox
{
    public class CheckComboBoxItem : ModelBase
    {
        public CheckComboBoxItem(bool isSelected, string text)
        {
            IsSelected = isSelected;
            Text = text;
        }

        private bool _isSelected;
        public bool IsSelected 
        { 
            get { return _isSelected; }
            set { Set(() => IsSelected, ref _isSelected, value); }
        }

        private string _text;
        public string Text 
        { 
            get { return _text; }
            set { Set(() => Text, ref _text, value); }
        }
    }

    static CheckComboBox()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(CheckComboBox), new FrameworkPropertyMetadata(typeof(CheckComboBox)));
    }

    public static readonly DependencyProperty SelectAllProperty =
        DependencyProperty.Register("SelectAll",
                                    typeof (bool),
                                    typeof (CheckComboBox),
                                    new FrameworkPropertyMetadata(false,
                                        FrameworkPropertyMetadataOptions.AffectsRender,
                                        new PropertyChangedCallback(OnSelectAll)));

    private static void OnSelectAll(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        CheckComboBox checkComboBox = (CheckComboBox)d;
        IEnumerable<CheckComboBoxItem> items = (IEnumerable<CheckComboBoxItem>) checkComboBox.ItemsSource;
        foreach (var item in items)
        {
            item.IsSelected = (bool) e.NewValue;
        }
    }

    public bool SelectAll
    {
        get { return (bool) GetValue(SelectAllProperty); }
        set { SetValue(SelectAllProperty, value); }
    }
}

公共类CheckComboBox:ComboBox
{
公共类CheckComboBoxItem:ModelBase
{
public CheckComboBoxItem（bool isSelected，字符串文本）
{
IsSelected=IsSelected；
文本=文本；
}
私立学校当选；
公选学校
{ 
获取{return}isSelected；}
集合{set（（）=>IsSelected，ref_IsSelected，value）；}
}
私有字符串_文本；
公共字符串文本
{ 
获取{return\u text；}
集合{set（（）=>Text，ref _Text，value）；}
}
}
静态复选框（）
{
DefaultStyleKeyProperty.OverrideMetadata（typeof（CheckComboBox）），new FrameworkPropertyMetadata（typeof（CheckComboBox））；
}
公共静态只读从属属性SelectAllProperty=
DependencyProperty.Register（“SelectAll”，
类型（bool），
类型（复选框），
新的FrameworkPropertyMetadata（错误，
FrameworkPropertyMetadataOptions.AffectsRender，
新财产变更回拨（OnSelectAll））；
SelectAll上的私有静态void（DependencyObject d、DependencyPropertyChangedEventArgs e）
{
CheckComboBox CheckComboBox=（CheckComboBox）d；
IEnumerable items=（IEnumerable）checkComboBox.ItemsSource；
foreach（项目中的var项目）
{
item.IsSelected=（bool）e.NewValue；
}
}
公共布尔SelectAll
{
获取{return（bool）GetValue（SelectAllProperty）；}
set{SetValue（SelectAllProperty，value）；}
}
}

---

现在，我只需要想一想，当另一个项目被取消选中时，如何自动取消选中“全选”复选框。

不要触摸“使用a”。这是真的。但是，即使ComboBoxItems绑定可以工作，绑定也不会触发“SelectAll”属性。

<ComboBoxItem>
    <CheckBox ... />
</ComboBoxItem>

...
<ComboBox.Resources>
    <ResourceDictionary>
        <CollectionViewSource x:Key="items" Source="{Binding ItemsSource, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}" />
    </ResourceDictionary>
</ComboBox.Resources>

<ComboBox.ItemsSource>
    <CompositeCollection>
        <ComboBoxItem>
            <CheckBox Content="All" IsChecked="{Binding SelectAll, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}" />
        </ComboBoxItem>
        <CollectionContainer Collection="{Binding Source={StaticResource items}}" />
    </CompositeCollection>
</ComboBox.ItemsSource>
...

public class CheckComboBox : ComboBox
{
    public class CheckComboBoxItem : ModelBase
    {
        public CheckComboBoxItem(bool isSelected, string text)
        {
            IsSelected = isSelected;
            Text = text;
        }

        private bool _isSelected;
        public bool IsSelected 
        { 
            get { return _isSelected; }
            set { Set(() => IsSelected, ref _isSelected, value); }
        }

        private string _text;
        public string Text 
        { 
            get { return _text; }
            set { Set(() => Text, ref _text, value); }
        }
    }

    static CheckComboBox()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(CheckComboBox), new FrameworkPropertyMetadata(typeof(CheckComboBox)));
    }

    public static readonly DependencyProperty SelectAllProperty =
        DependencyProperty.Register("SelectAll",
                                    typeof (bool),
                                    typeof (CheckComboBox),
                                    new FrameworkPropertyMetadata(false,
                                        FrameworkPropertyMetadataOptions.AffectsRender,
                                        new PropertyChangedCallback(OnSelectAll)));

    private static void OnSelectAll(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        CheckComboBox checkComboBox = (CheckComboBox)d;
        IEnumerable<CheckComboBoxItem> items = (IEnumerable<CheckComboBoxItem>) checkComboBox.ItemsSource;
        foreach (var item in items)
        {
            item.IsSelected = (bool) e.NewValue;
        }
    }

    public bool SelectAll
    {
        get { return (bool) GetValue(SelectAllProperty); }
        set { SetValue(SelectAllProperty, value); }
    }
}