Ecco il codice sorgente per Msgbox. Come puoi vedere, non fa nulla di particolarmente interessante prima di chiamare MessageBox.Show.
<MethodImpl(MethodImplOptions.NoInlining), HostProtection(SecurityAction.LinkDemand, Resources:=HostProtectionResource.UI)> _
Public Shared Function MsgBox(ByVal Prompt As Object, ByVal Optional Buttons As MsgBoxStyle = 0, ByVal Optional Title As Object = new Object()) As MsgBoxResult
Dim owner As IWin32Window = Nothing
Dim text As String = Nothing
Dim titleFromAssembly As String
Dim vBHost As IVbHost = HostServices.VBHost
If (Not vBHost Is Nothing) Then
owner = vBHost.GetParentWindow
End If
If ((((Buttons And 15) > MsgBoxStyle.RetryCancel) OrElse ((Buttons And 240) > MsgBoxStyle.Information)) OrElse ((Buttons And &HF00) > MsgBoxStyle.DefaultButton3)) Then
Buttons = MsgBoxStyle.OkOnly
End If
Try
If (Not Prompt Is Nothing) Then
[text] = CStr(Conversions.ChangeType(Prompt, GetType(String)))
End If
Catch exception As StackOverflowException
Throw exception
Catch exception2 As OutOfMemoryException
Throw exception2
Catch exception3 As ThreadAbortException
Throw exception3
Catch exception9 As Exception
Throw New ArgumentException(Utils.GetResourceString("Argument_InvalidValueType2", New String() { "Prompt", "String" }))
End Try
Try
If (Title Is Nothing) Then
If (vBHost Is Nothing) Then
titleFromAssembly = Interaction.GetTitleFromAssembly(Assembly.GetCallingAssembly)
Else
titleFromAssembly = vBHost.GetWindowTitle
End If
Else
titleFromAssembly = Conversions.ToString(Title)
End If
Catch exception4 As StackOverflowException
Throw exception4
Catch exception5 As OutOfMemoryException
Throw exception5
Catch exception6 As ThreadAbortException
Throw exception6
Catch exception13 As Exception
Throw New ArgumentException(Utils.GetResourceString("Argument_InvalidValueType2", New String() { "Title", "String" }))
End Try
Return DirectCast(MessageBox.Show(owner, [text], titleFromAssembly, (DirectCast(Buttons, MessageBoxButtons) And DirectCast(15, MessageBoxButtons)), (DirectCast(Buttons, MessageBoxIcon) And DirectCast(240, MessageBoxIcon)), (DirectCast(Buttons, MessageBoxDefaultButton) And DirectCast(&HF00, MessageBoxDefaultButton)), (DirectCast(Buttons, MessageBoxOptions) And DirectCast(-4096, MessageBoxOptions))), MsgBoxResult)
End Function
fonte
2012-01-10 07:46:36
+1 Anche se esiste principalmente * per compatibilità con le versioni precedenti * con codice VB6 funzionante già esistente. Anche i programmatori sheesh! C# sono prolissi :) – MarkJ
Sto scoprendo che non posso chiamare MessageBox da una libreria non GUI. Sembrerebbe che avrei bisogno di fare riferimento/importare System.Windows.Forms per usarlo nella libreria, ma ciò rovinerebbe la ragione per cui sto usando una libreria. MsgBox funziona correttamente (per trasmettere informazioni all'applicazione della GUI principale), quindi c'è almeno una differenza. –