RelativeSource 从未调用过

Question

我想将代码后面的命令绑定到 UserControl.Resources

中的用户控制按钮 (ICommand)

所以我用RelativeSource写了一段代码。但是没用。

我尝试使用转换器进行调试来解决这个问题。

但即使这样也没有调用。

这是我编写的代码。如果我错了请告诉我。

谢谢。

XAML

<UserControl x:Class="Views.Common.SubMenuPanel"
             xmlns:controls="...."                
             ....
             mc:Ignorable="d">

<UserControl.Resources>            
    <controls:SubMenuButton x:Key="TerminateSystem" 
                            ButtonName="Terminate System" 
      [[DOESN'T WORK]] -->  Execute="{Binding RelativeSource={RelativeSource  AncestorType={x:Type UserControl}}, Path=TerminateSystemCommand
                                    , Converter={StaticResource DebugDummyConverter}}"
                            ImageURI="...png"/>       

    <CollectionViewSource x:Key="LoginViewSubMenuItems">
        <CollectionViewSource.Source>
            <system:ArrayList>
                <StaticResource ResourceKey="TerminateSystem"/>
            </system:ArrayList>
        </CollectionViewSource.Source>
    </CollectionViewSource>
</UserControl.Resources>

<Grid>
   <ListBox ItemsSource="{Binding Source={StaticResource LoginViewSubMenuItems}}"/>
</Grid>

Code Behind

public partial class SubMenuPanel : UserControl
{
     public ICommand TerminateSystemCommand => new RelayCommand(() => Do Something);

     public SubMenuPanel()
     {
        InitializeComponent();

        this.DataContext = this;
     }
}

Answer 1

您正在将 ICommand 绑定到 Execute 属性。您应该绑定的属性是 Command，即

<controls:SubMenuButton x:Key="TerminateSystem" 
                        ButtonName="Terminate System" 
                        Command="{Binding RelativeSource={RelativeSource  AncestorType= 
                                 {x:Type UserControl}}, Path=TerminateSystemCommand
                                    , Converter={StaticResource DebugDummyConverter}}"
                       ImageURI="...png"/>

假设按钮中的其他属性没有引起其他问题，应该可以解决问题。

编辑：

我包含了我已验证有效的代码。因为我没有你对 SubMenuButton 的定义，所以我只是使用 Button 来代替：

XAML:

<UserControl.Resources>
    <Button x:Key="TerminateSystem" 
            Command="{Binding RelativeSource={RelativeSource  AncestorType={x:Type UserControl}}, Path=TerminateSystemCommand}">
        Say Hello World!!!!
    </Button>
    <CollectionViewSource x:Key="LoginViewSubMenuItems">
        <CollectionViewSource.Source>
            <system:ArrayList>
                <StaticResource ResourceKey="TerminateSystem"/>
            </system:ArrayList>
        </CollectionViewSource.Source>
    </CollectionViewSource>            
</UserControl.Resources>

<Grid>
    <ListBox ItemsSource="{Binding Source={StaticResource LoginViewSubMenuItems}}"/>
</Grid>

后面的代码：

public ICommand TerminateSystemCommand =>
        new RelayCommand(() => Console.WriteLine("Hello World!!!"));

RelativeSource 从未调用过

RelativeSource never called

.net

wpf

xaml

binding

relativesource