WPF窗体 Grid的双击事件绑定Command

背景：WPF窗体需要实现双击窗体最上方的标题条实现最大化和还原

1.通过命令绑定的方式实现

xaml代码

<Grid x:Name="leftTop" Grid.Row="0" Grid.Column="0" Background="{StaticResource DarkBG}">
                                <Grid.InputBindings>
                                    <MouseBinding MouseAction="LeftDoubleClick" Command="{Binding DoubleClickMaximizeWindowCommand,RelativeSource={RelativeSource TemplatedParent}}"></MouseBinding>
                                </Grid.InputBindings>
5 </Grid>

绑定部分代码：

public ICommand DoubleClickMaximizeWindowCommand { get; protected set; }
var bind4 = new CommandBinding(DoubleClickMaximizeWindowCommand);
            bind4.Executed += DoubleClickMaxCommand_Execute;
            this.CommandBindings.Add(bind4);

private void DoubleClickMaxCommand_Execute(object sender, ExecutedRoutedEventArgs e)
        {
            this.WindowState = this.WindowState == WindowState.Maximized ? WindowState.Normal : WindowState.Maximized;
            e.Handled = true;
        }

2.如果不使用绑定的实现

xaml代码

<Grid x:Name="leftTop" Grid.Row="0" MouseDown="LeftTop_MouseDown" 
</Grid>

对应的.xaml.cs代码

private void LeftTop_MouseDown(object sender, MouseButtonEventArgs e)
{
    if (e.ClickCount == 2)
    {
        this.WindowState = this.WindowState == WindowState.Maximized ? WindowState.Normal : WindowState.Maximized;
        e.Handled = true;
    }
} 

备注：

因为Grid并没有暴露出直接能用的DoubleClick事件（所以事件绑定时使用Grid.InputBindings），所以通过MouseDown的参数MouseButtonEventArgs中的ClickCount属性来判断双击。