InvalidCOMObjectException: COM object that has been separated from its underlying RCW cannot be used?
I'm getting this exception thrown when I run my tests:
Test method
OuvertureClasseur
threw exception: System.Runtime.InteropServices.InvalidComObjectException: COM object that has been separated from its underlying RCW cannot be used...
though each of my test passes when ran individually.
Here's my tests code:
<TestClass()> _
Public Class FabriqueExcelTests
Private Shared _xl As ApplicationClass
<ClassInitialize()> _
Public Shared Sub MyClassInitialize(ByVal testContext As TestContext)
_xl = New ApplicationClass()
_xl.Visible = False
_xl.ScreenUpdating = False
_xl.DisplayAlerts = False
End Sub
<ClassCleanup()> _
Public Shared Sub MyClassCleanup()
_xl.Quit()
_xl = Nothing
End Sub
<TestMethod()> _
Public Sub ConstructeurParDefaut()
Dim gestionnaire As GestionnaireExcel = New GestionnaireExcel()
Assert.IsNotNull(gestionnaire)
Assert.IsInstanceOfType(gestionnaire, GetType(GestionnaireExcel))
End Sub
<TestMethod()>
Public Sub CreationDUnFichierExcel()
Dim fichier As String = "C:\Temp\CreationFichierExcel.xls"
Using xl As GestionnaireExcel = New GestionnaireExcel()
Dim classeur As Workbook = xl.CreerClasseur(fichier)
classeur.Close()
classeur = Nothing
End Using
Assert.IsTrue(File.Exists(fichier))
File.Delete(fichier)
End Sub
<TestMethod()> _
Public Sub OuvertureClasseur()
Dim fichier As String = "C:\Temp\OuvertureClasseur.xls"
_xl.Workbooks.Add(XlWBATemplate.xlWBATWorksheet)
_xl.ActiveWorkbook.SaveAs(fichier)
_xl.ActiveWorkbook.Saved = True
_xl.Workbooks.Close()
Using xl As GestionnaireExcel = New GestionnaireExcel()
Dim classeur As Workbook = xl.OuvrirClasseur(fichier)
Assert.AreEqual(fichier, classeur.FullName)
classeur.Close()
classeur = Nothing
End Using
File.Delete(fichier)
End Sub
End Class
And my GestionnaireExcel
class:
Public Class GestionnaireExcel
Implements IDisposable
Private _cultureOriginale As CultureInfo
Private _disposedValue As Boolean = False '' To detect redundant calls
Private _excel As ApplicationClass
Public Sub New()
InitialiserExcel()
End Sub
'' IDisposable
Protected Overridable Sub Dispose(ByVal disposing As Boolean)
If Not Me._disposedValue Then
If disposing Then
'' TODO: free other state (managed objects).
If (_excel IsNot Nothing) Then
_excel.Quit()
_excel = Nothing
System.Threading.Thread.CurrentThread.CurrentCulture = _cultureOriginale
End If
End If
'' TODO: free your own state (unmanaged objects).
'' TODO: set large fields to null.
End If
Me._disposedValue = True
End Sub
'' This code added by Visual Basic to correctly implement the disposable pattern.
Public Sub Dispose() Implements IDisposable.Dispose
'' Do not change this code. Put cleanup code in Dispose(ByVal disposing As Boolean) above.
Dispose(True)
GC.SuppressFinalize(Me)
End Sub
Public Function CreerClasseur(ByVal classeur As String) As Workbook
_excel.Workbooks.Add(XlWBATemplate.xlWBATWorksheet)
_excel.ActiveWorkbook.SaveAs(classeur)
Return _excel.ActiveWorkbook
End Function
Private Sub InitialiserExcel()
_cultureOriginale = System.Threading.Thread.CurrentThread.CurrentCulture
System.Threading.Thread.CurrentThread.CurrentCulture = New CultureInfo("en-US")
_excel = New ApplicationClass()
_excel.DisplayAlerts = False
_excel.ScreenUpdating = False
_excel.Visible = False
End Sub
Public Function OuvrirClasseur(ByVal fichier As String) As Workbook
Dim classeur As Workbook = _excel.Workbooks.Open(fichier _
, False, False _
, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing _
, False 开发者_运维技巧_
, Type.Missing, Type.Missing _
, False _
, Type.Missing, Type.Missing)
Return classeur
End Function
End Class
Related questions found
Though I have read and understand these questions and answers, I don't seem to find what causes my OuvertureClasseur()
test to fail when I run all my tests together, and it works just fine when I run it individually.
- COM object that has been separated from its underlying RCW cannot be used.
- WMI Exception: “COM object that has been separated from its underlying RCW cannot be used”
- COM object that has been separated from its underlying RCW cannot be used.
- COM object that has been separated from its underlying RCW can not be used - why does it happen?
- WPF Thread: “COM object that has been separated from its underlying RCW cannot be used.”
I have been running around for few hours now, and any help will gladly be appreciated.
Thanks in advance! =)
Excel's executing as another process. It's possible that what's happening in classeur.Close() is asynchronous, and that some of it is taking place after the GestionnaireExcel instance is disposed.
Try commenting out the using block and see what happens.
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