WPF无边框可拖动窗体

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApplication1"
        mc:Ignorable="d" WindowStyle="None"
        Title="MainWindow" Height="350" Width="525"  AllowsTransparency="True">

    <Grid Name="grid" Height="350" Width="525" Background="Transparent">       
    </Grid>   
</Window>

  public MainWindow()
        {
            InitializeComponent();
            this.grid.MouseLeftButtonDown += (o, e) => { DragMove(); };
        }