Why can't set cast an object from Excel interop?
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Published on 2010-04-22T23:30:30Z
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2010/04/22
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Trying to get a reference to the worksheets (using Excel interop):
Excel.Application xl = new Excel.ApplicationClass();
Excel.Workbooks xlWorkBooks = xl.Workbooks;
Excel.Workbook xlWorkBook = xlWorkBooks.Open(fileName, 0, false, 5, "",
"", true, Excel.XlPlatform.xlWindows, "\t",
false, false, 0, true, 1, 0);
Excel.Worksheets xlWorkSheets = (Excel.Worksheets) xlWorkBook.Worksheets; // crashes
The error is that it cannot cast it:
Unable to cast COM object of type 'System.__ComObject' to interface type 'Microsoft.Office.Interop.Excel.Worksheets'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{000208B1-0000-0000-C000-000000000046}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).
Is my cast incorrect?
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