您引用的按钮在WPF中被处理为MediaCommands、NavigationCommands、ApplicationCommands、EditingCommands或ComponentCommands-您需要为您想要拦截的每个按钮添加CommandBinding，例如：-

<Window.CommandBindings>
<CommandBinding Command="MediaCommands.PreviousTrack" 
                Executed="PreviousTrackCommandBinding_Executed"/>
<CommandBinding Command="MediaCommands.NextTrack"             
                Executed="NextTrackCommandBinding_Executed"/>

并在后面的代码中添加相关事件：-

private void PreviousTrackCommandBinding_Executed(object sender, ExecutedRoutedEventArgs e)
{
    MessageBox.Show("Previous track");
}
private void NextTrackCommandBinding_Executed(object sender, ExecutedRoutedEventArgs e)
{
    MessageBox.Show("Next track");
}

我会说，在您的情况下，它可能是NavigationCommands.BrowseForward和NavigationCommands. BrowseBack。检查... http://msdn.microsoft.com/en-us/library/system.windows.input.navigationcommands.aspx和http://msdn.microsoft.com/en-us/library/system.windows.input.navigationcommands_members.aspx
查看我的博客文章以获取更多信息和更多代码示例。
http://richardhopton.blogspot.com/2009/08/responding-to-mediapresentation-buttons.html

在PreviewKeyUp事件中，您应该能够执行此操作-

private void Window_PreviewKeyUp(object sender, KeyEventArgs e){
  if (e.SystemKey == Key.BrowserBack)
    // Do something ...

我不想这么说，但这对我来说很好：

<RichTextBox>   
       <RichTextBox.InputBindings>
           <KeyBinding Key="BrowserForward" Command="Paste"/>
       </RichTextBox.InputBindings>
       <FlowDocument>
            <Paragraph>
                Some text here to cut and paste...
                            </Paragraph>
            </FlowDocument>
        </RichTextBox>

当我按下键盘上的前进键时，它会粘贴。
有没有可能是其他什么东西拦截了按键？