Disposing of Microsoft.Office.Interop.Word.Application

Question

(Somewhat of a follow on from the post (which remains unanswered): https://stackoverflow.com/q/6197829/314661)

Using the following code

Application app = new Application(); _Document doc = app.Documents.Open("myDocPath.docx", false, false, false); doc.PrintOut(false); doc.Close(); 

I am attempting to open and print a file programmatically.

The problem is each time I run the above code a new WINWORD.exe process is started and obviously this quickly eats up all the memory.

The application class doesn't seem to contain a dispose/close or similar method.

After a bit of research I (realized) and changed the code to the following.

 Application app = new Application();  _Document doc = app.Documents.Open(fullFilePath + ".doc", false, false, false);  doc.PrintOut(false);  doc.Close();  int res = System.Runtime.InteropServices.Marshal.ReleaseComObject(doc);  int res1 = System.Runtime.InteropServices.Marshal.ReleaseComObject(app); 

And I can see the remaining reference count is zero but the processes remain?

PS: I'm using Version 14 of the Microsoft.Office.Interop library.

Answer 1

Do you not need to call Quit?

app.Quit(); 

Answer 2

Perhaps try setting doc = null and calling GC.Collect()

Edit, not really my own code I forget where I got it but this is what I use to dispose of Excel, and it does the job maybe you can glean something from this:

public void DisposeExcelInstance() {     app.DisplayAlerts = false;     workBook.Close(null, null, null);     app.Workbooks.Close();     app.Quit();     if (workSheet != null)         System.Runtime.InteropServices.Marshal.ReleaseComObject(workSheet);     if (workBook != null)         System.Runtime.InteropServices.Marshal.ReleaseComObject(workBook);     if (app != null)         System.Runtime.InteropServices.Marshal.ReleaseComObject(app);     workSheet = null;     workBook = null;     app = null;     GC.Collect(); // force final cleanup! }