Interop.Excel库无法在WindowsService中运行

Question

在Visual Studio中使用ASP.Net的网站上，我成功发送了一封包含xls文件的电子邮件。但是当我复制这段代码时，它在windowsService中不起作用。当我调试时，它们没有任何错误，程序只是在

之前挂起

Excel.ApplicationClass excel = new Excel.ApplicationClass();  

这一部分。

使用LocalSystem运行，我已经尝试制作此文件夹了。

 C:\Windows\SysWOW64\config\systemprofile\Desktop

 C:\Windows\System32\config\systemprofile\Desktop

但仍然坚持下去。 这是代码。

     private void Email()
    {
        //get the data from database
        DataTable data = GetData();
        DataTable email_data = GetEmailData();

        this.WriteToFile("78");  
        // Create an Excel object and add workbook...


      ////////////program stops here
        Excel.ApplicationClass excel = new Excel.ApplicationClass();
        Excel.Workbook workbook = excel.Application.Workbooks.Add(false); // true for object template???

        this.WriteToFile("7");
        // Global missing reference for objects we are not defining...
        object missing = System.Reflection.Missing.Value;

        this.WriteToFile("77");
        // Add column headings...
        int iCol = 0;
        foreach (DataColumn c in data.Columns)
        {
            iCol++;
            excel.Cells[1, iCol] = c.ColumnName;
        }
        // for each row of data...
        int iRow = 0;
        foreach (DataRow r in data.Rows)
        {
            iRow++;

            // add each row's cell data...
            iCol = 0;
            foreach (DataColumn c in data.Columns)
            {
                iCol++;
                excel.Cells[iRow + 1, iCol] = r[c.ColumnName];
            }
        }



        // If wanting to Save the workbook...
        this.WriteToFile("1");


        workbook.SaveAs(@"C:\Windows\temp\NSOList.xls",
        Excel.XlFileFormat.xlWorkbookNormal, missing, missing,
        false, false, Excel.XlSaveAsAccessMode.xlExclusive,
        missing, missing, missing, missing, missing);

        this.WriteToFile("2");
        workbook.Close();

        using (MailMessage mm = new MailMessage())
        {
            this.WriteToFile("3");
            mm.From = new MailAddress("aa@gmail.com");

            for (int i = 0; i < email_data.Rows.Count; i++)
            {
                mm.Bcc.Add(email_data.Rows[i][0].ToString());
            }
            using (SmtpClient smtp = new SmtpClient())
            {

                mm.Subject = "List";

                mm.Attachments.Add(new Attachment(@"C:\Windows\temp\List.xls"));
                mm.IsBodyHtml = true;

                smtp.Host = "smtp.gmail.com";
                smtp.EnableSsl = true;
                System.Net.NetworkCredential credentials = new System.Net.NetworkCredential();
                credentials.UserName = "aa@gmail.com";
                credentials.Password = "1234";
                smtp.UseDefaultCredentials = true;
                smtp.Credentials = credentials;
                smtp.Port = 587;
                this.WriteToFile("4");
                Thread.Sleep(1000);
                smtp.Send(mm);
            }

        }

    }