在VB.Net中,要使窗体出现在Windows 10的所有桌面上,可以使用以下步骤:
Imports System.Windows.Forms
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
' 设置窗体样式为ToolWindow,这样窗体将不会在任务栏上显示
Me.FormBorderStyle = FormBorderStyle.FixedToolWindow
' 设置窗体的TopMost属性为True,这样窗体将始终显示在其他窗体之上
Me.TopMost = True
' 设置窗体的父窗口为桌面窗口
Dim desktopHandle As IntPtr = NativeMethods.GetDesktopWindow()
NativeMethods.SetParent(Me.Handle, desktopHandle)
' 设置窗体的位置和大小,使其覆盖整个桌面
Dim desktopRect As NativeMethods.RECT
NativeMethods.GetWindowRect(desktopHandle, desktopRect)
Me.Location = New Point(desktopRect.Left, desktopRect.Top)
Me.Size = New Size(desktopRect.Right - desktopRect.Left, desktopRect.Bottom - desktopRect.Top)
End Sub
Private Class NativeMethods
<DllImport("user32.dll", SetLastError:=True)>
Public Shared Function GetDesktopWindow() As IntPtr
End Function
<DllImport("user32.dll", SetLastError:=True)>
Public Shared Function SetParent(hWndChild As IntPtr, hWndNewParent As IntPtr) As IntPtr
End Function
<DllImport("user32.dll", SetLastError:=True)>
Public Shared Function GetWindowRect(hWnd As IntPtr, ByRef lpRect As RECT) As Boolean
End Function
Public Structure RECT
Public Left As Integer
Public Top As Integer
Public Right As Integer
Public Bottom As Integer
End Structure
End Class
通过以上步骤,窗体将以ToolWindow样式显示,并且始终显示在其他窗体之上,覆盖整个桌面。请注意,这种方法只适用于Windows 10操作系统。
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