让窗口显示在所有虚拟桌面上

功能如图

C#代码实现如下

public partial class MainWindow : Window
{public MainWindow(){InitializeComponent();ShowInTaskbar = false;this.Loaded += MainWindow_Loaded;}private void MainWindow_Loaded(object sender, RoutedEventArgs e){IntPtr a = new System.Windows.Interop.WindowInteropHelper(this).Handle;IntPtr hWnd = new WindowInteropHelper(this).Handle;IntPtr longhWnd = GetWindowLongPtr(hWnd, GetWindowLongFields.GWL_EXSTYLE);var re = SetWindowLongPtr(hWnd, GetWindowLongFields.GWL_EXSTYLE, new IntPtr((int)longhWnd | 0x08000000));}[DllImport("user32.dll")]static extern int SetWindowLongPtr(IntPtr hWnd, GetWindowLongFields nIndex, IntPtr dwNewLong);[DllImport("user32.dll")]static extern IntPtr GetWindowLongPtr(IntPtr hWnd, GetWindowLongFields nIndex);private const int GWL_EXSTYLE = -20;private const int WS_EX_TOOLWINDOW = 0x00000080; // 使窗口不会在任务栏显示private const int WS_EX_APPWINDOW = 0x00040000; // 使窗口出现在任务栏private const int WS_EX_NOREDIRECTIONBITMAP = 0x00200000;
}
public enum GetWindowLongFields
{/// <summary>/// 设定一个新的扩展风格/// Retrieves the extended window styles/// </summary>GWL_EXSTYLE = -20,/// <summary>/// 设置一个新的应用程序实例句柄/// Retrieves a handle to the application instance/// </summary>GWL_HINSTANCE = -6,/// <summary>/// 改变子窗口的父窗口/// Retrieves a handle to the parent window, if any/// </summary>GWL_HWNDPARENT = -8,/// <summary>///  设置一个新的窗口标识符/// Retrieves the identifier of the window/// </summary>GWL_ID = -12,/// <summary>/// 设定一个新的窗口风格/// Retrieves the window styles/// </summary>GWL_STYLE = -16,/// <summary>/// 设置与窗口有关的32位值。每个窗口均有一个由创建该窗口的应用程序使用的32位值/// Retrieves the user data associated with the window. This data is intended for use by the application that created the window. Its value is initially zero/// </summary>GWL_USERDATA = -21,/// <summary>/// 为窗口设定一个新的处理函数/// Retrieves the address of the window procedure, or a handle representing the address of the window procedure. You must use the CallWindowProc function to call the window procedure/// </summary>GWL_WNDPROC = -4,
}

特别提醒一句 

ShowInTaskbar = false;