WPF ContextMenu IsChecked 绑定

Question

如何为"IsChecked"编写绑定？我想检查 2 个菜单中的任何一个。

如果我点击 "Hello1"，我想在 "Hello1" 上添加检查，并删除 "Hello2".

的检查

如果我点击 "Hello2"，我想在 "Hello2" 上添加检查，并删除 "Hello1".

的检查

我试了 1 周。但是我不能。请帮助我 "How to write binding" 没有互联网的例子。我最近开始 WPF 编程。我只能做表格申请。这是非常大的不同....

<Window x:Class="WpfApp2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp2"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">

    <Window.Resources>
        <ContextMenu Name="ContextMenuMain" x:Key="menuListBox">
            <MenuItem Header="Hello1" IsChecked="{Binding Path=IsCheck1, Mode=OneWay}"  Name="ContextMenu_Hello1" Click="ContextMenuClick_Hello1"/>
        <MenuItem Header="Hello2"   IsChecked="{Binding Path=IsCheck2, Mode=OneWay}" Name="ContextMenu_Hello2" Click="ContextMenuClick_Hello2"/>
    </ContextMenu>
    </Window.Resources>

</Window>

我最难的地方在代码下面。我试图在 MainWindow 中使用 "ContextMenu_Hello1" 的名称。但是C#不允许我使用它...

public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            ContextMenu_Hello1.DataContext  // error !
        }
    }

这超出范围了吗？但是为什么？

Answer 1

设置window的ContextMenu属性。如果您希望能够检查菜单项，您还应该将 IsCheckable 属性设置为 true。另外，您不能将绑定模式设置为 OneWay:

<Window x:Class="WpfApp2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp2"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">

    <Window.ContextMenu>
        <ContextMenu Name="ContextMenuMain">
            <MenuItem Header="Hello1" IsCheckable="True" IsChecked="{Binding Path=IsCheck1}"  Name="ContextMenu_Hello1" />
            <MenuItem Header="Hello2" IsCheckable="True" IsChecked="{Binding Path=IsCheck2}" Name="ContextMenu_Hello2" />
        </ContextMenu>
    </Window.ContextMenu>
</Window>

完成这些更改后，您可以绑定到 DataContext:

的任何属性

public partial class MainWindow : Window, INotifyPropertyChanged
{
    public MainWindow ()
    {
        InitializeComponent();
        DataContext = this;
    }

    private bool _isCheck1;
    public bool IsCheck1
    {
        get { return _isCheck1; }
        set
        {
            _isCheck1 = value;
            NotifyPropertyChanged();
            _isCheck2 = !_isCheck1;
            NotifyPropertyChanged("IsCheck2");
        }
    }

    private bool _isCheck2;
    public bool IsCheck2
    {
        get { return _isCheck2; }
        set
        {
            _isCheck2 = value;
            NotifyPropertyChanged();
            _isCheck1 = !_isCheck2;
            NotifyPropertyChanged("IsCheck1");
        }
    }


    public event PropertyChangedEventHandler PropertyChanged;
    private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}

WPF ContextMenu IsChecked 绑定

WPF ContextMenu IsChecked Binding

wpf

binding

contextmenu