VSTO - Outlook - Unload addin

VSTO - Outlook - Unload addin

• PatrickEh

  This also doesn't seem to work. As soon as

  AppDomain.Unload(AppDomain.CurrentDomain)

  is hit, an exception is generated and the code falls through to my catch. The exception that is generated has no message or other info EXCEPT for the info that the exception occurred on the line above.

  Any ideas

  Thank you

  Kelly Johnson

  
  

• Nathanial Woolls

  Thank you very much. That worked great.

  Thank you again

  Kelly Johnson

  
  

• x_collins

  Hi Kelly,

  I understand that you are trying to unload the VSTO solution based of logic in the startup. Below is a code sample on how you could do this. This works for Word and Excel solutions. Note that doing this in Outlook will cause your add-in to be blacklisted. Outlook does this if the startup doesn't return correctly, for example if there was an exception thrown.

  Public Class ThisDocument

  Private Sub ThisDocument_Open() Handles Me.Open

  'see that the code is actually running

  MessageBox.Show("Opened")

  End Sub

  Private Sub ThisDocument_Startup(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Startup

  Dim I As String = InputBox("Shutdown, 'Doc' or 'Code'")

  If I = "Doc" Then

  'Close the document and don't save changes

  Me.Close(False)

  ElseIf I = "Code" Then

  'shutdown the code but open the document

  AppDomain.Unload(AppDomain.CurrentDomain)

  End If

  'If not 'Doc' or 'Code' then just open normally

  End Sub

  Private Sub ThisDocument_Shutdown(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Shutdown

  End Sub

  End Class

  Paul Stubbs
  Program Manager

  
  
  

• Mircea Marghidanu

  Maybe this is a really dumb question, but how does this work

  When I tried this code, the compiler complained that 0x80004004 would not go into an int (it needed to be a uint). (0x80004004 = 2,147,500,036 an int can only hold 2,147,483,647). If I instead use

  const uint E_ABORT = 0x80004004;

  that part compiles fine, but "ThrowExceptionForHR" complains because it is expecting an int and not a uint.

  If I try:

  System.Runtime.InteropServices.Marshal.ThrowExceptionForHR(0x80004004);

  the compiler also complains about a uint being passed in ThrowExceptionForHR's int parameter.

  Any light you could shine on this would be greatly greatly appreciated.

  Thank you very much

  Kelly Johnson

  
  

• epion

  Sorry, I was a bit careless. Try declaring as below instead:

  const int E_ABORT = unchecked((int)0x80004004);

  Also notice that at debug time you will get a dialog saying the add-in failed to load. However, this dialog will not pop up if Outlook started normally i.e. not under debugger.

  
  
  

• khs1

  If you want to tell Outlook to unload your add-in without disabling it you need to return E_ABORT. To do so from managed code you would to throw an exception with the corresponding code.

  Something like this should work:

  const int E_ABORT = 0x80004004;

  void ThisApplication_Startup()
  {

  ....... do your logic here
  if (needToUnload)
  System.Runtime.InteropServices.Marshal.ThrowExceptionForHR(E_ABORT);
  }

  
  
  

• Martin Selway

  For example, using VS.NET 2003 and C#, you could do the following to unload the addin programatically:

  Marshal.ReleaseComObject (m_AddInInstance);

  Marshal.ReleaseComObject (m_OutlookApplicationObject);

  GC.Collect();

  GC.WaitForPendingFinalizers();

  GC.Collect();

  GC.WaitForPendingFinalizers();

  Obviously that code doesn't work with VS.NET 2005, C#, and VSTO. But there has to be some way to programmatically unload an addin in its "ThisApplication_Startup" method. There are too many scenarios where this is important for it to have been left out (for example: licensing and error handling)

  Thank you

  Kelly Johnson

  
  

• Christoffee

  Thank you both very much for the replies.

  Thanks again

  Kelly Johnson

  
  

• helloworld123

  Hi Kelly,
  You can do something like this:

  int hr2 = unchecked ((int)0x80004004); // cast succeeds even if overflow
  System.Runtime.InteropServices.Marshal.ThrowExceptionForHR(hr);

  Error HRESULTs are 32 bit values with the most significant bit set to 1 to indicate an error. E.g. 0x81234567

  Hex 8 0 0 0 4 0 0 4
  Bin 1000 0000 0000 0000 0100 0000 0000 0100

  But Int32.MaxValue is defined as 0x7fffffff:

  Hex 7 f f f f f f f
  Bin 0111 1111 1111 1111 1111 1111 1111 1111

  Notice that the M.S.B is reserved for the sign bit. We need to set this bit, but the value 0x80004004 can not be normally assigned to an Int32 type. The unchecked keyword ensures that no overflow exception is thrown even though the value is larger than Int32.MaxValue.

  
  
  
• VSTO - Outlook - Unload addin