如何在C＃中修改Excel电子表格，另存为其他名称并删除原始电子表格

Question

我有一个Windows Form应用程序，它为用户提供了一个打开对话框以打开电子表格。

该应用程序在该电子表格上执行一些任务，例如排序和删除空白行。 然后，完成后，它将使用当前日期作为新文件名的一部分执行SaveAs。

完成之后，我要删除原始电子表格。

我正在使用Microsoft.Office.Interop.Excel。

我在StackOverflow上找到了代码（ 如何正确清理Excel互操作对象？ ），该代码显示了如何关闭Excel，nightcoder在该帖子中的第三个答案甚至显示了一种方法（我正在使用），该方法将从流程中删除Excel “任务管理器”标签。

我以为，一旦Excel从任务管理器中转出，它就会用我要关闭的文件删除冰冷的触手状的死亡夹，但是我错了。

当代码命中File.Delete（MyFile）命令时，它仍然说我无法删除此文件，因为它上面有冰冷的触手般的死亡之握或类似的东西。

有谁知道我在哪里可以找到足够大的棒球棍来让该应用释放文件。 我真的很想删除它。

================================================== ============
2013年7月22日更新

这是我到目前为止的代码的一部分。

该代码的作用是允许用户选择一个excel电子表格，将其打开，重命名然后关闭。 我去除了一些我认为不必要的操纵电子表格的代码。

我要保存的重命名文件是关闭原始文件，打开重命名文件并退出应用程序，同时保留重命名的电子表格以进行进一步编辑。

当前它不这样做。 它仅使用新名称创建电子表格，然后关闭应用程序和电子表格。 然后，我必须手动打开新的电子表格。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Runtime.InteropServices;
using Excel = Microsoft.Office.Interop.Excel;
using System.Diagnostics;
using Microsoft.Office.Interop.Excel; 

namespace Weekly_Stats_Organizer
{
    public partial class Form1 : Form
    {
        [DllImport("user32.dll")]
        private static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);

        string _ExcelFileName;

        private string ExcelFileName
        {
            get { return _ExcelFileName; }
            set { _ExcelFileName = value; }
        }
        private string DefaultPath = "C:\\My Documents\\Weekly Stats";

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Stream FileName = null;
            OpenFileDialog OpenExcelSpreadsheet = new OpenFileDialog();
            OpenExcelSpreadsheet.InitialDirectory = DefaultPath;
            OpenExcelSpreadsheet.Filter = "Excel 2003 (*.xls)|*.xls|Excel 2007 (*.xlsx)|*.xlsx";
            OpenExcelSpreadsheet.FilterIndex = 1;
            OpenExcelSpreadsheet.RestoreDirectory = true;
            if(OpenExcelSpreadsheet.ShowDialog() == DialogResult.OK)
            {
                if((FileName = OpenExcelSpreadsheet.OpenFile()) != null)
                {
                    ExcelFileName = ((System.Windows.Forms.FileDialog)(OpenExcelSpreadsheet)).FileName;
                    GenerateWorkbook();
                }
            }
        }

        private void GetExcel()
        {

            Excel.Application ExcelApp = null;
            Excel.Workbook ExcelWorkBook = null;
            Excel.Sheets ExcelSheets = null;
            Excel.Worksheet MySheet = null;
            try
            {

                DateTime CurrentDate = DateTime.Today;
                string FileName = DefaultPath + "\\" + CurrentDate.Year.ToString() + "-" + CurrentDate.Month.ToString("D2") + "-" + CurrentDate.Day.ToString("D2") + " Weekly Stats.xls";

                ExcelApp = new Excel.Application();
                ExcelApp.Visible = false;
                ExcelWorkBook = ExcelApp.Workbooks.Open(ExcelFileName, 0, true, 5, "", "", false, Excel.XlPlatform.xlWindows, "", true, false, 0, true, false, false);

                ExcelSheets = ExcelWorkBook.Worksheets;

                MySheet = (Excel.Worksheet)ExcelSheets.get_Item("Sheet 1");

                ExcelWorkBook.SaveAs(FileName, Excel.XlFileFormat.xlWorkbookNormal, "", "", false, false,
                    Excel.XlSaveAsAccessMode.xlNoChange, Excel.XlSaveConflictResolution.xlUserResolution, true, "", "", "");

                //GC.Collect();
                //GC.WaitForPendingFinalizers();

                Marshal.ReleaseComObject(MySheet);
                Marshal.ReleaseComObject(ExcelSheets);

                MySheet = null;
                ExcelSheets = null;

                ExcelWorkBook.Close(false, System.Reflection.Missing.Value, System.Reflection.Missing.Value);
            }
            finally
            {
                Marshal.ReleaseComObject(ExcelWorkBook);

                int hWnd = ExcelApp.Application.Hwnd;
                TryKillProcessByMainWindowHwnd(hWnd);

                Marshal.ReleaseComObject(ExcelApp);
                ExcelWorkBook = null;
                ExcelApp = null;

                //if (File.Exists(ExcelFileName))
                //    File.Delete(ExcelFileName);

                System.Windows.Forms.Application.Exit();

            }


        }

        //=========================================================================================================================================
        //=========================================================================================================================================
        //=========================================================================================================================================
        // This code was found at https://stackoverflow.com/questions/158706/how-to-properly-clean-up-excel-interop-objects
        // is the answer provided by nightcoder.  This solution seems to be the only one that actually clears the Excel instance out of the 
        // Processes in Windows Task Manager.  The idea is to completely shut down Excel so that I can delete the original spreadsheet.  So far not
        // working out so well.
        private void GenerateWorkbook()
        {
          try
          {
              GetExcel();
          }
          finally
          {
            GC.Collect();
            GC.WaitForPendingFinalizers();
          }
        }

        //=============================================================================================================================================
        /// <summary> Tries to find and kill process by hWnd to the main window of the process.</summary>
        /// <param name="hWnd">Handle to the main window of the process.</param>
        /// <returns>True if process was found and killed. False if process was not found by hWnd or if it could not be killed.</returns>
        public static bool TryKillProcessByMainWindowHwnd(int hWnd)
        {
            uint processID;
            GetWindowThreadProcessId((IntPtr)hWnd, out processID);
            if (processID == 0) return false;
            try
            {
                Process.GetProcessById((int)processID).Kill();
            }
            catch (ArgumentException)
            {
                return false;
            }
            catch (Win32Exception)
            {
                return false;
            }
            catch (NotSupportedException)
            {
                return false;
            }
            catch (InvalidOperationException)
            {
                return false;
            }
            return true;
        }

        /// <summary> Finds and kills process by hWnd to the main window of the process.</summary>
        /// <param name="hWnd">Handle to the main window of the process.</param>
        /// <exception cref="ArgumentException">
        /// Thrown when process is not found by the hWnd parameter (the process is not running). 
        /// The identifier of the process might be expired.
        /// </exception>
        /// <exception cref="Win32Exception">See Process.Kill() exceptions documentation.</exception>
        /// <exception cref="NotSupportedException">See Process.Kill() exceptions documentation.</exception>
        /// <exception cref="InvalidOperationException">See Process.Kill() exceptions documentation.</exception>
        public static void KillProcessByMainWindowHwnd(int hWnd)
        {
            uint processID;
            GetWindowThreadProcessId((IntPtr)hWnd, out processID);
            if (processID == 0)
                throw new ArgumentException("Process has not been found by the given main window handle.", "hWnd");
            Process.GetProcessById((int)processID).Kill();
        }
        //=========================================================================================================================================
        //=========================================================================================================================================
        //=========================================================================================================================================
    }
}

Answer 1

您拥有此代码的位置：

       ExcelWorkBook.SaveAs(FileName, Excel.XlFileFormat.xlWorkbookNormal, "", "", false, false,
            Excel.XlSaveAsAccessMode.xlNoChange, Excel.XlSaveConflictResolution.xlUserResolution, true, "", "", "");

请尝试插入以下内容：

       string oldFileName = ExcelWorkBook.FullName;
       ExcelWorkBook.SaveAs(FileName, Excel.XlFileFormat.xlWorkbookNormal, "", "", false, false,
            Excel.XlSaveAsAccessMode.xlNoChange, Excel.XlSaveConflictResolution.xlUserResolution, true, "", "", "");
       File.Delete(oldFileName);

您保留前一个文件名的副本并将其删除。

警告：由于您没有提供独立的示例，因此我无法对此进行完全测试。 另外，您可能需要编辑此选项以仅在保存成功并且文件名与原始文件名不同时删除。