MessageBox Top Most True

Question

is there way to make the default messagebox ( MessageBox.Show() ) TopMost true which also stays on top even if the messagebox lost the focus? I don't want to create a custom one. Is there a way doing it by using SetWindowHook or something similar? I already researched a lot but all solutions I found were not working. Can someone help me out how to do this in VB.net or C#?

Answer 1

最简单的方法是调用MessageBox函数并传递MB_SYSTEMMODAL标志。

Answer 2

I got it. This will show a messagebox on top of all windows opened, doesn't matter if they have Topmost options or not, the messagebox appears always in front.

    Public Enum MessageBoxResult As UInteger
        Ok = 1
        Cancel
        Abort
        Retry
        Ignore
        Yes
        No
        Close
        Help
        TryAgain
        ContinueOn
        Timeout = 32000
    End Enum

    Public Enum MessageBoxOptions As UInteger
        SystemModal = &H1000
        NoFocus = &H8000
        SetForeground = &H10000
        Topmost = &H40000
    End Enum

    <DllImport("user32.dll", EntryPoint:="MessageBoxW", SetLastError:=True, Charset:=CharSet.Unicode)> _
    Public Shared Function MessageBox(hwnd As IntPtr, _
      <MarshalAs(UnmanagedType.LPTStr)> lpText As String, _
      <MarshalAs(UnmanagedType.LPTStr)> lpCaption As String, _
      <MarshalAs(UnmanagedType.U4)> uType As MessageBoxOptions) As <MarshalAs(UnmanagedType.U4)> MessageBoxResult
    End Function

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        MessageBox(IntPtr.Zero, TextBox2.Text, TextBox1.Text, MessageBoxButtons.OK Or MessageBoxOptions.SystemModal + MessageBoxOptions.Topmost + MessageBoxOptions.SetForeground + MessageBoxIcon.Information)
    End Sub
End Class