Question

检查我的代码我在vb.net中自动从excel上传这是我的代码

import statement

Imports Excel = Microsoft.Office.Interop.Excel

releaseObject函数

Private Sub releaseObject(ByVal obj As Object)
    Try

        System.Runtime.InteropServices.Marshal.ReleaseComObject(obj)


        obj = Nothing
    Catch ex As Exception
        obj = Nothing
    Finally

        GC.Collect()

    End Try
End Sub

按钮点击事件

Protected Sub ButtonUpload_Click(ByVal sender As Object, ByVal e As EventArgs) Handles ButtonUpload.Click
    If IsPostBack Then
       Dim xlApp As Excel.Application
        Dim xlWorkBooks As Excel.Workbooks
        Dim xlWorkBook As Excel.Workbook
        Dim xlWorkSheet As Excel.Worksheet
        Dim range As Excel.Range
        connStr = ConfigurationManager.ConnectionStrings("LocalSqlServer").ConnectionString
        conn = New SqlConnection(connStr)
        dat = System.DateTime.Now

        Filepath = Path.GetFullPath(fileUploadBOM.PostedFile.FileName)
        sFileName = Path.GetFileName(fileUploadBOM.PostedFile.FileName)
        FileFormat = Path.GetExtension(Filepath)

        v_bom_type = "IMPORT"
        If FileFormat.Equals(".xls") Or FileFormat.Equals(".xlsx") Then
            System.IO.File.Delete("C:\inetpub\wwwroot\Uploads\" & sFileName)
            fileUploadBOM.PostedFile.SaveAs(sFileDir + sFileName)
            Try
                xlApp = New Excel.ApplicationClass
                xlWorkBooks = xlApp.Workbooks
                xlWorkBook = xlWorkBooks.Open(sFileDir + sFileName)
                xlWorkSheet = xlWorkBook.Worksheets("BOM for Import")
                range = xlWorkSheet.Cells
            Catch ex As Exception
                releaseObject(xlApp)
                'GetWindowThreadProcessId(xlApp.Hwnd, processID)
                'release(processID)

            End Try

有些情况如...

             Dim R As String
            R = CType(range.Cells(4, 2), Excel.Range).Value()
            If Not R Is Nothing Then
                If (R.Trim = "") Then
                    Me.Page.ClientScript.RegisterStartupScript(Me.GetType(), "SetStatusText", "<script type='text/javascript'> alert('please enter the OEM for logistics cost'); </script>")
                    releaseObject(range)
                    releaseObject(xlWorkSheet)
                    xlWorkBook.Save()
                    xlWorkBook.Close()
                    releaseObject(xlWorkBook)
                    xlWorkBooks.Close()
                    releaseObject(xlWorkBooks)

                    xlApp.Quit()

                    releaseObject(xlApp)



                    'GetWindowThreadProcessId(xlApp.Hwnd, processID)
                    'MsgBox(processID)
                    'release(processID)

                    Exit Sub
                Else
                    v_logiccost = CType(range.Cells(4, 2), Excel.Range).Value()
                End If
            Else
                Me.Page.ClientScript.RegisterStartupScript(Me.GetType(), "SetStatusText", "<script type='text/javascript'> alert('please enter the OEM for logistics cost'); </script>")
                releaseObject(range)
                releaseObject(xlWorkSheet)
                xlWorkBook.Save()
                xlWorkBook.Close()
                releaseObject(xlWorkBook)
                xlWorkBooks.Close()
                releaseObject(xlWorkBooks)

                xlApp.Quit()

                releaseObject(xlApp)


                'GetWindowThreadProcessId(xlApp.Hwnd, processID)
                'MsgBox(processID)
                'release(processID)

                Exit Sub
            End If


            '' No of yrs of support

            Dim P As String
            P = CType(range.Cells(6, 2), Excel.Range).Value()
            releaseObject(range)
            If Not P Is Nothing Then
                If (IsNumeric(P) = True) Then
                    v_year = P
                Else
                    Me.Page.ClientScript.RegisterStartupScript(Me.GetType(), "SetStatusText", "<script type='text/javascript'> alert('No Of Years Support Should Be A Number.'); </script>")
                    releaseObject(range)
                    releaseObject(xlWorkSheet)
                    xlWorkBook.Save()
                    xlWorkBook.Close()
                    releaseObject(xlWorkBook)
                    xlWorkBooks.Close()
                    releaseObject(xlWorkBooks)

                    xlApp.Quit()

                    releaseObject(xlApp)



                    'GetWindowThreadProcessId(xlApp.Hwnd, processID)
                    'MsgBox(processID)
                    'release(processID)


                    Exit Sub
                End If
            End If

函数调用最后释放

releaseObject(range)
                    releaseObject(xlWorkSheet)
                    xlWorkBook.Save()
                    xlWorkBook.Close()
                    releaseObject(xlWorkBook)
                    xlWorkBooks.Close()
                    releaseObject(xlWorkBooks)

                    xlApp.Quit()

                    releaseObject(xlApp)

这是我的整个代码我想问题是Range.cells引用RCW 建议我在哪里做错了

Answer 1

很少有事情

A）在编码方面，我一直坚信1个入口点和1个退出点。在您的代码中，您有几个退出点。您的代码现在看起来像这样

    If A = B Then
        '
        '~~> Rest of the code
        '
        'release object
        Exit Sub
    Else

    End If

    If C = D Then

    Else
        '
        '~~> Rest of the code
        '
        'release object
        Exit Sub
    End If

    releaseObject(xlrange)
    releaseObject(xlWorkSheet)
    releaseObject(xlWorkBook)
    releaseObject(xlApp)

如果我们正确关闭对象，则很难跟踪。最好的方法是组合它们，然后在离开sub之前释放对象。您的上述代码可以重写为

    If A = B Then
        '
        '~~> Rest of the code
        '
    Else
        If C = D Then

        Else
            '
            '~~> Rest of the code
            '
        End If
    End If

    releaseObject(xlrange)
    releaseObject(xlWorkSheet)
    releaseObject(xlWorkBook)
    releaseObject(xlApp)

B）正如亚历克斯和克里斯所提到的，以正确的顺序释放你的对象（你最终在做的但不是在代码的中间）。喜欢这个

    releaseObject(xlrange)
    releaseObject(xlWorkSheet)
    releaseObject(xlWorkBook)
    releaseObject(xlApp)

如果你加入了我的第一个建议，那么你不必在任何地方维护发布对象代码，只是最后。

C）我看到您已将Excel对象声明为PUBLIC您是否在ButtonUpload_Click以外的其他地方使用它们

如果是，例如Form Load，请确保您正确发布它们
如果不是，请将其移至ButtonUpload_Click

如果您使用上述建议，那么在使用TWO DOT规则时，我发现在发布对象时没有问题。

休息我发现现有代码没有任何问题。它对我来说很好。

Answer 2

Thanx一切都解决了

Private Sub releaseObject(ByVal obj As Object)
Try

    System.Runtime.InteropServices.Marshal.ReleaseComObject(obj)



Catch ex As Exception

Finally
obj = Nothing


End Try
End Sub

Excel应用程序不退出

2 个答案: