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

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!
}