C# - 如何以编程方式添加Excel工作表 - Office XP/2003

Question

我刚刚开始通过C#调整Excel,以便能够自动创建,并添加到Excel文件中.

我可以打开文件并更新其数据并浏览现有的工作表.我的问题是如何添加新表？

我试过了:

Excel.Worksheet newWorksheet;
newWorksheet = (Excel.Worksheet)excelApp.ThisWorkbook.Worksheets.Add(
                Type.Missing, Type.Missing, Type.Missing, Type.Missing);

但我得到COM异常,我的谷歌搜索没有给我任何答案.

来自HRESULT的异常:0x800A03EC来源是:"Interop.Excel"

我希望有人能够让我摆脱困境.

Answer 1

您需要在项目中将"Microsoft Excel 11.0 Object Library COM"引用添加到" " - 或者任何适合的版本.

这段代码适合我:

private void AddWorksheetToExcelWorkbook(string fullFilename,string worksheetName)
{
    Microsoft.Office.Interop.Excel.Application xlApp = null;
    Workbook xlWorkbook = null;
    Sheets xlSheets = null;
    Worksheet xlNewSheet = null;

    try {
        xlApp = new Microsoft.Office.Interop.Excel.Application();

        if (xlApp == null)
            return;

        // Uncomment the line below if you want to see what's happening in Excel
        // xlApp.Visible = true;

        xlWorkbook = xlApp.Workbooks.Open(fullFilename, 0, false, 5, "", "",
                false, XlPlatform.xlWindows, "",
                true, false, 0, true, false, false);

        xlSheets = xlWorkbook.Sheets as Sheets;

        // The first argument below inserts the new worksheet as the first one
        xlNewSheet = (Worksheet)xlSheets.Add(xlSheets[1], Type.Missing, Type.Missing, Type.Missing);
        xlNewSheet.Name = worksheetName;

        xlWorkbook.Save();
        xlWorkbook.Close(Type.Missing,Type.Missing,Type.Missing);
        xlApp.Quit();
    }
    finally {
        Marshal.ReleaseComObject(xlNewSheet);
        Marshal.ReleaseComObject(xlSheets);
        Marshal.ReleaseComObject(xlWorkbook);
        Marshal.ReleaseComObject(xlApp);
        xlApp = null;
    }
}

请注意,您需要非常小心地正确清理和释放COM对象引用.包含在StackOverflow问题中是一个有用的经验法则:"切勿对COM对象使用2个点".在你的代码中; 你会遇到真正的麻烦.我上面的演示代码没有正确清理Excel应用程序,但它是一个开始!

在查看这个问题时,我发现其他一些链接:

• 使用C#打开和导航Excel
• 如何:使用COM Interop创建Excel电子表格(C#编程指南)
• 如何:向工作簿添加新工作表

根据MSDN

要使用COM互操作,您必须具有管理员或高级用户安全权限.

希望有所帮助.

Answer 2

在此感谢您的一些优秀回复.@AR.,你的明星,它完美无缺.昨晚我注意到Excel.exe没有关闭; 所以我做了一些研究,发现了如何释放COM对象.这是我的最终代码:

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.IO;
using Excel;

namespace testExcelconsoleApp
{
    class Program
    {
        private String fileLoc = @"C:\temp\test.xls";

        static void Main(string[] args)
        {
            Program p = new Program();
            p.createExcel();
        }

        private void createExcel()
        {
            Excel.Application excelApp = null;
            Excel.Workbook workbook = null;
            Excel.Sheets sheets = null;
            Excel.Worksheet newSheet = null;

            try
            {
                FileInfo file = new FileInfo(fileLoc);
                if (file.Exists)
                {
                    excelApp = new Excel.Application();
                    workbook = excelApp.Workbooks.Open(fileLoc, 0, false, 5, "", "",
                                                        false, XlPlatform.xlWindows, "",
                                                        true, false, 0, true, false, false);

                    sheets = workbook.Sheets;

                    //check columns exist
                    foreach (Excel.Worksheet sheet in sheets)
                    {
                        Console.WriteLine(sheet.Name);
                        sheet.Select(Type.Missing);

                        System.Runtime.InteropServices.Marshal.ReleaseComObject(sheet);
                    }

                    newSheet = (Worksheet)sheets.Add(sheets[1], Type.Missing, Type.Missing, Type.Missing);
                    newSheet.Name = "My New Sheet";
                    newSheet.Cells[1, 1] = "BOO!";

                    workbook.Save();
                    workbook.Close(null, null, null);
                    excelApp.Quit();
                }
            }
            finally
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(newSheet);
                System.Runtime.InteropServices.Marshal.ReleaseComObject(sheets);
                System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook);
                System.Runtime.InteropServices.Marshal.ReleaseComObject(excelApp);

                newSheet = null;
                sheets = null;
                workbook = null;
                excelApp = null;

                GC.Collect();
            }
        }
    }
}

谢谢你的帮助.