WPF 不遮挡任务栏最大化和全屏显示

using System;
using System.Windows;
using System.Windows.Threading;

namespace thzSoftware
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        DispatcherTimer mTimer;
        public MainWindow()
        {
            InitializeComponent();
            mTimer = new DispatcherTimer();
            mTimer.Interval = new TimeSpan(0, 0, 3);//定时间隔3秒
            mTimer.Tick += MTimer_Tick;//加载事件，敲tab键事件框架可以自己出来
            mTimer.Start();
        }
        private void MTimer_Tick(object sender, EventArgs e)
        {
            MessageBox.Show(this.Width.ToString() + "***" + this.Height.ToString());
        }
    }
}

<Window x:Class="thzSoftware.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:thzSoftware"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800" WindowState="Maximized">
    <Grid ShowGridLines="True" Margin="5">
        <Grid.RowDefinitions>
            <RowDefinition Height="*"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="4*"/>
        </Grid.ColumnDefinitions>
        <Image Name="Cam1" Grid.Row="0" Grid.Column="0" Source="C:\Users\admin\source\repos\thzSoftware\thzSoftware\bin\Debug\Cam1.jpg"/>
        <Image Name="Cam2" Grid.Row="1" Grid.Column="0" Source="C:\Users\admin\source\repos\thzSoftware\thzSoftware\bin\Debug\Cam2.jpg"/>
    </Grid>
</Window>

  this.Height = SystemParameters.WorkArea.Height;
  this.Width = SystemParameters.WorkArea.Width;////得到屏幕工作区域宽度

 this.Width = System.Windows.SystemParameters.PrimaryScreenWidth;////得到屏幕整体宽度
 this.Height = System.Windows.SystemParameters.PrimaryScreenHeight;

  this.Height = SystemParameters.MaximizedPrimaryScreenHeight;
  this.Width = SystemParameters.MaximizedPrimaryScreenWidth;

//全屏代码：
private void Window_Loaded(object sender, RoutedEventArgs e)

{
    // 设置全屏
    this.WindowState = System.Windows.WindowState.Normal;
    this.WindowStyle = System.Windows.WindowStyle.None;
    this.ResizeMode = System.Windows.ResizeMode.NoResize;
    this.Topmost = true;

    this.Left = 0.0;
    this.Top = 0.0;
    this.Width = System.Windows.SystemParameters.PrimaryScreenWidth;
    this.Height = System.Windows.SystemParameters.PrimaryScreenHeight;
}