如何处理我的 Excel 应用程序

Question

我的代码如下

Excel.Application xlApp = new Excel.Application();
Excel.Workbook xlWorkbook = xlApp.Workbooks.Open(file);

Excel.Worksheet xlSheet = xlWorkbook.Sheets[1]; // get first sheet
Excel.Range xlRange = xlSheet.UsedRange;

这些是我的函数中使用的唯一变量

foreach (Excel.Worksheet XLws in xlWorkbook.Worksheets)
{
    // do some stuff 

    xlApp.UserControl = false;

    if (xlRange != null)
        System.Runtime.InteropServices.Marshal.FinalReleaseComObject(xlRange);

    if (xlSheet != null)
        System.Runtime.InteropServices.Marshal.FinalReleaseComObject(xlSheet);

    if (xlWorkbook != null)
        System.Runtime.InteropServices.Marshal.FinalReleaseComObject(xlWorkbook);

    xlRange = null;
    xlSheet = null;
    xlWorkbook = null;
    xlApp.Quit();

    System.Runtime.InteropServices.Marshal.FinalReleaseComObject(xlApp);
}

但我仍然在任务管理器中得到 EXCEL.EXE

请帮忙？

Answer 1

杀死MainWindowTitle为空值的excel进程。下面是一个示例源代码。

    Microsoft.Office.Interop.Excel.Application oXL;
    Microsoft.Office.Interop.Excel._Workbook oWB;
    Microsoft.Office.Interop.Excel._Worksheet oSheet;
    Microsoft.Office.Interop.Excel.Range oRng;
    object misvalue = System.Reflection.Missing.Value;
    try
    {
        //Start Excel and get Application object.
        oXL = new Microsoft.Office.Interop.Excel.Application();
        oXL.Visible = true;

        //Get a new workbook.
        oWB = (Microsoft.Office.Interop.Excel._Workbook)(oXL.Workbooks.Add(""));
        oSheet = (Microsoft.Office.Interop.Excel._Worksheet)oWB.ActiveSheet;

        //Add table headers going cell by cell.
        oSheet.Cells[1, 1] = "First Name";
        oSheet.Cells[1, 2] = "Last Name";
        oSheet.Cells[1, 3] = "Full Name";
        oSheet.Cells[1, 4] = "Salary";

        //Format A1:D1 as bold, vertical alignment = center.
        oSheet.get_Range("A1", "D1").Font.Bold = true;
        oSheet.get_Range("A1", "D1").VerticalAlignment =
            Microsoft.Office.Interop.Excel.XlVAlign.xlVAlignCenter;

        // Create an array to multiple values at once.
        string[,] saNames = new string[5, 2];

        saNames[0, 0] = "John";
        saNames[0, 1] = "Smith";
        saNames[1, 0] = "Tom";

        saNames[4, 1] = "Johnson";

        //Fill A2:B6 with an array of values (First and Last Names).
        oSheet.get_Range("A2", "B6").Value2 = saNames;

        //Fill C2:C6 with a relative formula (=A2 & " " & B2).
        oRng = oSheet.get_Range("C2", "C6");
        oRng.Formula = "=A2 & \" \" & B2";

        //Fill D2:D6 with a formula(=RAND()*100000) and apply format.
        oRng = oSheet.get_Range("D2", "D6");
        oRng.Formula = "=RAND()*100000";
        oRng.NumberFormat = "$0.00";

        //AutoFit columns A:D.
        oRng = oSheet.get_Range("A1", "D1");
        oRng.EntireColumn.AutoFit();

        oXL.Visible = false;
        oXL.UserControl = false;
        oWB.SaveAs("c:\\test505.xls", Microsoft.Office.Interop.Excel.XlFileFormat.xlWorkbookDefault, Type.Missing, Type.Missing,
                false, false, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange,
                Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);

        oWB.Close(null, null, null);
        oXL.Quit();  //MainWindowTitle will become empty afer being close

        System.Runtime.InteropServices.Marshal.FinalReleaseComObject(oXL);
        System.Runtime.InteropServices.Marshal.FinalReleaseComObject(oWB);

        Process[] excelProcesses = Process.GetProcessesByName("excel");
        foreach (Process p in excelProcesses)
        {
            if (string.IsNullOrEmpty(p.MainWindowTitle)) // use MainWindowTitle to distinguish this excel process with other excel processes 
            {
                p.Kill();
            }
        }
    }
    catch (Exception ex2)
    {

    }

Answer 2

你有一个隐式对象保持打开状态。试试这个

Excel.Application xlApp = new Excel.Application();
Excel.Workbooks xlWorkbooks = xlApp.Workbooks;
Excel.Workbook xlWorkbook = xlWorkbooks.Open(file);
....    

System.Runtime.InteropServices.Marshal.FinalReleaseComObject(xlApp);
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(xlWorkbooks);
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(xlWorkbook);
....    

Answer 3

好的...我希望这会有所帮助...我花了很长时间来调整它以使其正常工作...

这是我的整个函数（VB —— 但复杂的东西的 C# 代码在那里（感谢帮助我走到这一步的太多其他 stackoverflow 巨头！）

Private Function ImportWorksFile() As Integer

    Dim EndofSheet As Boolean
    Dim BlankRowCounter As Integer
    Dim rr As RowResult
    Dim SecCount As Integer = 0
    Dim SecRow As SecurityRow

    Dim uf As New UtilFunctions

    'If this has already been run, the instance of the excel object would have been 'killed' and needs to be reinstantiated
    If blnExcelProcessKilled Then 'Global boolean var
        xlApp = New Excel.Application()
        blnExcelProcessKilled = False
    End If
    Dim excelProcess(0) As Process
    excelProcess = Process.GetProcessesByName("excel")

    Dim tmp As Excel.Workbooks
    Try
        tmp = xlApp.Workbooks
        xlWorkBook = tmp.Open(WorkingFileName)
    Catch ex As Exception
        MessageBox.Show("There was a problem opening the workbook - please try again", CurAFLApp.AppName, MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
        Return 0
    End Try

    Using dc As New AFLData(CurAFLApp, True)

        Dim cmd As SqlCommand = DefineCommand()
        cmd.CommandType = CommandType.StoredProcedure

        For Each ws As Excel.Worksheet In xlWorkBook.Worksheets

            Dim row As Integer = 1
            EndofSheet = False
            BlankRowCounter = 0

            If ImpCols.ContainsKey(ws.Name) Then
                SecRow = New SecurityRow(ImpCols(ws.Name))

                Do Until EndofSheet
                    Try
                        SecRow.NewRow(ws.Rows(row))
                        rr = SecRow.IsValidRow

                        If rr = RowResult.Valid Then
                            ' read this row and process
                            With cmd
                                .Parameters("@AcctDate").Value = FileDate
                                .Parameters("@NewSub").Value = SecRow.GetStrCell("newsub")
                                RunProcedure(cmd)
                            End With

                            SecCount += 1

                            BlankRowCounter = 0

                        Else
                            BlankRowCounter += rr

                        End If

                    Catch ex As Exception
                        MessageBox.Show("There was a problem with row: " & row & " in workbook " & ws.Name)

                    End Try

                    ' if we've counted 50 blank A column values in a row, we're done.
                    If BlankRowCounter <= -50 Then
                        EndofSheet = True
                    End If

                    row += 1
                Loop
            End If
        Next
    End Using

    Try

        xlWorkBook.Close(SaveChanges:=False)
        xlApp.Workbooks.Close()
        xlApp.Quit()

        '// And now kill the process. C# Version (for reference)
        'if (processID != 0)
        '{
        '    Process process = Process.GetProcessById(processID);
        '    process.Kill();
        '}

        ' Reversed the order of release per  http://stackoverflow.com/questions/12916137/best-way-to-release-excel-interop-com-object


    Catch ex As Exception
        MessageBox.Show("There was a problem CLOSING the workbook - Please double check that the data was imported correctly. ", CurAFLApp.AppName, MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
        Return 0
    Finally

        releaseObject(tmp)
        releaseObject(xlWorkBook)
        releaseObject(xlApp)
        If Not excelProcess(0).CloseMainWindow() Then

            excelProcess(0).Kill()
            blnExcelProcessKilled = True
        End If

    End Try

    Return SecCount

End Function

Public Sub releaseObject(ByVal obj As Object)
    Try
        System.Runtime.InteropServices.Marshal.ReleaseComObject(obj)
        obj = Nothing
    Catch ex As Exception
        obj = Nothing
    Finally
        GC.Collect()
        'Not sure if the following line helps or hinders -- seems to lock things up once in a while
        'GC.WaitForPendingFinalizers()
    End Try
End Sub

Answer 4

试试：

xlWorkbook.Close(false); // if you Workbook should not be saved

而不是：

if (xlWorkbook != null)
   System.Runtime.InteropServices.Marshal.FinalReleaseComObject(xlWorkbook);

xlWorkbook = null;