按照@styx的建议-我已经实现了自定义TriggerAction，绝对不是最通用的解决方案（例如，与WebkeCommandAction代码相比），但对我来说很有效，我猜。还尝试用2个参数实现命令，其中第二个参数是协变的，类型为EventArgs，但记得我受到ICommand接口的Execute（对象）方法的限制，所以必须将参数打包到元组中。下面是我自定义TriggerAction：

public sealed class EventToCommandAction : TriggerAction<DependencyObject>
{
    public static readonly DependencyProperty CommandProperty = DependencyProperty.Register("Command", typeof(ICommand), typeof(EventToCommandAction), null);

    public ICommand Command
    {
        get { return (ICommand)GetValue(CommandProperty); }
        set { SetValue(CommandProperty, value); }
    }

    public static readonly DependencyProperty SenderProperty = DependencyProperty.Register("Sender", typeof(object), typeof(EventToCommandAction), null);
    public object Sender
    {
        get { return GetValue(SenderProperty); }
        set { SetValue(SenderProperty, value); }
    }

    protected override void Invoke(object parameter)
    {
        if (AssociatedObject == null)
            return;

        ICommand command = Command;
        if (command != null)
        {
            Tuple<object, EventArgs> args = new Tuple<object, EventArgs>(Sender, (EventArgs)parameter);
            if (command.CanExecute(args))
                command.Execute(args);
        }
    }
}

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