wpf 如何让当前窗口隐藏

XMAL中
<Window x:Class="WpfNoScreen.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525" ShowInTaskbar="False" WindowState="Minimized" Visibility="Hidden">
    <Grid>

    </Grid>
</Window>

构造函数中 
// ShowInTaskbar="False" WindowState="Minimized" Visibility="Hidden"
            this.ShowInTaskbar = false;
            this.Visibility = Visibility.Hidden;

            MessageBox.Show("完成了");