Interop Excel not closing process

问题

I have been struggling with this problem for a couple of days, I have made reasearch and applied all the suggestions I found on various forums but I'm still unable to solve it.

My problem is with excel using interop library, I have an excel file used as template, so I am opening it and saving in a new location with a new name. Everything works great except that the Excel process keeps runing after the file is created and closed.

This is my code

protected string CreateExcel(string strProjectID, string strFileMapPath)
{
    string strCurrentDir = HttpContext.Current.Server.MapPath("~/Reports/Templates/");
    string strFile = "Not_Created";

    Application oXL;
    Workbook oWB;        

    oXL = new Application();
    oXL.Visible = false;

    Workbooks wbks = oXL.Workbooks;
    //opening template file
    oWB = wbks.Open(strFileMapPath);        

    oXL.Visible = false;
    oXL.UserControl = false;
    strFile = strProjectID + "_" + DateTime.Now.Ticks.ToString() + ".xlsx";
    //Saving file with new name
   oWB.SaveAs(strCurrentDir + strFile, XlFileFormat.xlWorkbookDefault, null, null,    false, false, XlSaveAsAccessMode.xlExclusive, false, false, null, null);

    oWB.Close(false, strCurrentDir + strFile, Type.Missing);

    wbks.Close();

    oXL.Quit();


    System.Runtime.InteropServices.Marshal.ReleaseComObject(oXL);
    System.Runtime.InteropServices.Marshal.ReleaseComObject(wbks);
    System.Runtime.InteropServices.Marshal.ReleaseComObject(oWB);


    oWB = null;
    oXL = null;
    wbks = null;
    GC.Collect();

    return strFile;
}

As you can see I am closing and releasing all the objects but the application does not quit.

I'm testing in a Windows Server 2008(production) and Windows 7(development) both in 32bits with IIS7.

回答1:

Try

Process excelProcess = Process.GetProcessesByName("EXCEL")[0];
if (!excelProcess.CloseMainWindow())
{
 excelProcess.Kill();
}

回答2:

This is how I got around this problem:

// Store the Excel processes before opening.
Process[] processesBefore = Process.GetProcessesByName("excel");

// Open the file in Excel.
Application excelApplication = new Application();
Workbook excelWorkbook = excelApplication.Workbooks.Open(Filename);

// Get Excel processes after opening the file.
Process[] processesAfter = Process.GetProcessesByName("excel");

// Now find the process id that was created, and store it.
int processID = 0;
foreach (Process process in processesAfter)
{
    if (!processesBefore.Select(p => p.Id).Contains(process.Id))
    {
        processID = process.Id;
    }
}

// Do the Excel stuff

// Now close the file with the COM object.
excelWorkbook.Close();
excelApplication.Workbooks.Close();
excelApplication.Quit();

// And now kill the process.
if (processID != 0)
{
    Process process = Process.GetProcessById(processID);
    process.Kill();
}

回答3:

I created this method for it, in my tests it works.

private void ClearMemory(Application excelApp) {
    excelApp.DisplayAlerts = false;
    excelApp.ActiveWorkbook.Close(0);
    excelApp.Quit();
    Marshal.ReleaseComObject(excelApp);
}

回答4:

Have a look here: How can I get the ProcessID (PID) for a hidden Excel Application instance

You can track down your ProcessID via GetWindowThreadProcessId API and than kill the process that particularly matches your instance of Excel Application object.

[DllImport("user32.dll")]
static extern int GetWindowThreadProcessId(int hWnd, out int lpdwProcessId);

Process GetExcelProcess(Microsoft.Office.Interop.Excel.Application excelApp)
{
     int id;
     GetWindowThreadProcessId(excelApp.Hwnd, out id);
     return Process.GetProcessById(id);
}

void TerminateExcelProcess(Microsoft.Office.Interop.Excel.Application excelApp)
{
     var process = GetExcelProcess(excelApp);
     if (process != null)
     {
          process.Kill();
     }
}

回答5:

Try using Open XML SDK 2.0 for Microsoft Office library to create excel document instead of using interop assemblies. It runs a lot faster in my experience and it's easier to use.

回答6:

Here is the VB version -- I have a large project that uses this and not the time to convert to a better system, so here is the same answer... in vb.NET

Use this to get the process ID (Prior to opening the excel sheet)

Dim excelProcess(0) As Process
excelProcess = Process.GetProcessesByName("excel")

After you're done with your sheet:

xlWorkBook.Close(SaveChanges:=False)
xlApp.Workbooks.Close()
xlApp.Quit()
'Kill the process
If Not excelProcess(0).CloseMainWindow() Then
    excelProcess(0).Kill()
End If

回答7:

Simple rule: avoid using double-dot-calling expressions, such as this:

var workbook = excel.Workbooks.Open(/*params*/)

(Reference)

回答8:

oWB.Close(false, strCurrentDir + strFile, Type.Missing);
oWB.Dispose();
wbks.Close();
wbks.Dispose();
oXL.Quit();
oXL.Dispose();


System.Runtime.InteropServices.Marshal.ReleaseComObject(oXL);
System.Runtime.InteropServices.Marshal.ReleaseComObject(wbks);
System.Runtime.InteropServices.Marshal.ReleaseComObject(oWB);

来源：https://stackoverflow.com/questions/15255065/interop-excel-not-closing-process