Question

我试图通过这种方式将Columns数据从列表中的Excel文件中获取：

private void Form1_Load(object sender, EventArgs e)
        {
            Excel.Application xlApp = new Excel.Application();
            Excel.Workbook xlWorkbook = xlApp.Workbooks.Open(@"D:/test.xlsx");
            Excel.Worksheet xlWorksheet = xlWorkbook.Sheets[1];
            Excel.Range xlRange = xlWorksheet.UsedRange;

            int rowCount = xlRange.Rows.Count;
            int colCount = xlRange.Columns.Count;

            List<string> FirstColumnValues = new List<string>();
            List<string> SecondColumnValues = new List<string>();

            for (int row=1; row <= rowCount; row++)
            {
                for (int col = 1; col <= colCount; col++)
                {
                    switch (col)
                    {
                        case 1:
                            FirstColumnValues.Add(xlRange.Cells[row, col].Value2.ToString());
                            break;
                        case 2:
                            SecondColumnValues.Add(xlRange.Cells[row, col].Value2.ToString());
                            break;
                    }
                }
            }

            if (FirstColumnValues.Count != 0 && SecondColumnValues.Count != 0)
            {
                xlWorkbook.Close();
                xlApp.Quit();
                MessageBox.Show("Completed");
                Marshal.ReleaseComObject(xlRange);
                Marshal.ReleaseComObject(xlWorksheet);
                Marshal.ReleaseComObject(xlWorkbook);
                Marshal.ReleaseComObject(xlApp);
                xlApp = null;
            }
        }

问题是，即使我已经尝试了所有正确关闭它的事情，但进程EXCEL.EXE仍未关闭。我知道这里有很多关于正确关闭excel过程的问题。但我不是专业人士，我几乎尝试了所有我能做的事情。仍然没有运气。

那么，任何人都可以告诉我这段代码有什么问题吗？当所有数据都存储在列表中时，如何关闭进程？

Answer 1

我知道这个问题已经得到了回答，但我想我会分享我试图解决同样问题的方法。希望有人会觉得这很有用。这是在vb.net中，但我确信它可以翻译。

Dim proc As System.Diagnostics.Process
        For Each proc In System.Diagnostics.Process.GetProcessesByName("EXCEL")
            If proc.MainWindowTitle.ToString = "" Then
                proc.Kill()
            End If
        Next

我发现当我通过我的应用程序打开Excel文件时，窗口标题为空，因此我没有关闭每个正在运行的Excel进程，而是关闭了没有标题的那些。

修改

如果你要终止这个过程，因为你找不到left over variables that haven't been cleaned up（基本上你用两个点设置的任何变量），那么至少要杀掉正确的Excel实例：

[DllImport("user32.dll", SetLastError = true)] private static extern int GetWindowThreadProcessId(IntPtr hwnd, ref int lpdwProcessId); ... if (xlApp != null) { GetWindowThreadProcessId(new IntPtr(xlApp.Hwnd), ref excelProcessId); Process ExcelProc = Process.GetProcessById(excelProcessId); if (ExcelProc != null) { ExcelProc.Kill(); }

我不主张杀戮过程，你应该用VSTO Contrib正确清理，例如：

using (var xlApp = new Microsoft.Office.Interop.Excel.Application().WithComCleanup())

Answer 2

我以前去过那里。这篇文章真正帮助我解决了这个问题：

http://devcity.net/Articles/239/1/article.aspx

Excel似乎非常顽固地终止了这个过程。您很可能最终会使用System.Diagnostics.Process终止该进程。

Answer 3

也许，您可以考虑使用try{}catch{}finally{}，然后尝试Marshal.FinalReleaseComObject。

不确定您是否看过this post，也可能会给您一些见解。

Answer 4

确保运行Excel实例最终终止（即应用程序退出时）的最简单方法是将顶级对象包装在try / finally块中。

Excel.Application xlApp;  
try{  
   xlApp = new Excel.Application();  
   ...do some work...  
}  
finally{  
   xlApp.DisableAlerts=True;  
   xlApp.Quit();  
   xlApp.DisableAlerts=False;  
   Marshal.ReleaseComObject(xlApp);  
}  

//If you don't mind having the Excel process kept alive for a while,  
//you don't even have to call ReleaseComObject() on the intermediate objects.  
//The runtime will eventually free the underlying COM objects.  

//If you want to clean up right away, your bookkeeping needs to be more thorough.  
//Every time you access a method or property that returns a runtime callable wrapper  
//(System.__ComObject), you'll need to assign them to a variable  
//and make sure Marshal.ReleaseComObject() is called.  

// More thorough bookkeeping...    
Excel.Application xlApp;  
try{  
   xlApp = new Excel.Application();  

   Excel.Workbooks xlWorkbooks = xlApp.Workbooks;  
   Excel.Workbook xlWorkbook = xlWorkbooks.Open(@"D:/test.xlsx");  
   Excel.Sheets xlSheets = xlWorkbook.Sheets;  
   Excel.Worksheet xlWorksheet = xlSheets[1];  
   Excel.Range xlRange = xlWorksheet.UsedRange;  

   ...inside the loop...  
   Excel.Range xlCell = xlRange.Cells[row, col];  
   FirstColumnValues.Add(xlCell.Value2.ToString());  
   Marshal.ReleaseComObject(xlCell);  

   ...inside the loop...  
   Excel.Range xlCell = xlRange.Cells[row, col];  
   SecondColumnValues.Add(xlCell.Value2.ToString());  
   Marshal.ReleaseComObject(xlCell);  

   ...do more work...  

   ...clean up...  
   Marshal.ReleaseComObject(xlRange);  
   Marshal.ReleaseComObject(xlWorksheet);  
   Marshal.ReleaseComObject(xlSheets);  
   Marshal.ReleaseComObject(xlWorkbook);  
   Marshal.ReleaseComObject(xlWorkbooks);  
}  
finally{  
   xlApp.DisableAlerts=True;  
   xlApp.Quit();  
   xlApp.DisableAlerts=False;  
   Marshal.ReleaseComObject(xlApp);  
}

获取数据后关闭EXCEL应用程序进程

4 个答案: