C# WPF应用程序中未正确执行命令绑定

我想在我的WPF应用程序中实现我的导航。目前StartScreen.xaml在启动时显示，但当我单击按钮时，DeviceManagement.xaml未显示。甚至没有调用ShowDeviceManagement命令

<UserControl ...>
     <Button
         Content="Click Me"
         Command="{Binding DataContext.ShowDeviceManagement, RelativeSource={RelativeSource AncestorType={x:Type vm:MainWindowViewModel}}, Mode=OneWay}"/>
</UserControl>

这让我假设按钮的命令不正确？我怎样才能修好它

<UserControl ...>
     <Button
         Content="Click Me"
         Command="{Binding DataContext.ShowDeviceManagement, RelativeSource={RelativeSource AncestorType={x:Type vm:MainWindowViewModel}}, Mode=OneWay}"/>
</UserControl>

App.xaml

<Application.Resources>
    <DataTemplate DataType="{x:Type vm:DeviceManagementViewModel}">
        <view:DeviceManagement />
    </DataTemplate>

    <DataTemplate DataType="{x:Type vm:MainWindowViewModel}">
        <view:StartScreen />
    </DataTemplate>
</Application.Resources>

<UserControl ...>
     <Button
         Content="Click Me"
         Command="{Binding DataContext.ShowDeviceManagement, RelativeSource={RelativeSource AncestorType={x:Type vm:MainWindowViewModel}}, Mode=OneWay}"/>
</UserControl>

“DataContext”在命令绑定中已过时。RelativeSource用于在可视树中查找祖先，而您的MainWindowViewModel不可视。应该是这样的：

<UserControl ...>
     <Button
         Content="Click Me"
         Command="{Binding DataContext.ShowDeviceManagement, RelativeSource={RelativeSource AncestorType={x:Type vm:MainWindowViewModel}}, Mode=OneWay}"/>
</UserControl>

Command="{Binding ShowDeviceManagement, Mode=OneWay}"

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尝试初始化RelayCommand并在构造函数中将其设置为private字段，在ShowDeviceManagement属性中只返回此字段，而不是在每次访问属性时创建命令实例。