c# data to excel 导出给出空文件

Question

我目前正在使用 c# 开发一些 Excel import/export，

她是我的导出函数：

        private void myButton11_Click(object sender, EventArgs e)
        {
            Microsoft.Office.Interop.Excel.Application excel;
            Microsoft.Office.Interop.Excel.Workbook excelworkbook;
            Microsoft.Office.Interop.Excel.Worksheet excelsheet;
            Microsoft.Office.Interop.Excel.Range excelCellFormat;

            excel = new Microsoft.Office.Interop.Excel.Application();
            excel.Visible = false;
            excel.DisplayAlerts = false;

            excelworkbook = excel.Workbooks.Add(Type.Missing);

            excelsheet = (Microsoft.Office.Interop.Excel.Worksheet)excelworkbook.ActiveSheet;
            excelsheet.Name = "dataToExcel";
            // fill in data
            excelsheet.Cells[1, 1] = "test";
            // left it pretty much empty so you have a nice exemple

            excelCellFormat = excelsheet.Range[excelsheet.Cells[1, 1], excelsheet.Cells[max+1, 13]];
            excelCellFormat.EntireColumn.AutoFit();
            Microsoft.Office.Interop.Excel.Borders border = excelCellFormat.Borders;
            border.LineStyle = Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous;
            border.Weight = 2d;

            SaveFileDialog sfd = new SaveFileDialog();
            sfd.Filter = "Excel (*.xlsx)|*.xlsx";
            sfd.Title = "Sauvegarde";
            sfd.ShowDialog();

            if(sfd.FileName != "")
            {
                System.IO.FileStream fs = (System.IO.FileStream)sfd.OpenFile();


                // save excel
                excelworkbook.SaveAs(fs,
                                    System.Reflection.Missing.Value,
                                    System.Reflection.Missing.Value,
                                    System.Reflection.Missing.Value,
                                    System.Reflection.Missing.Value,
                                    System.Reflection.Missing.Value,
                                    Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange,
                                    System.Reflection.Missing.Value,
                                    System.Reflection.Missing.Value,
                                    System.Reflection.Missing.Value,
                                    System.Reflection.Missing.Value,
                                    System.Reflection.Missing.Value);
                fs.Close();
            }


            excel.Quit();

            // for a pdf version
            //excelworkbook.ExportAsFixedFormat(Microsoft.Office.Interop.Excel.XlFixedFormatType.xlTypePDF,
            //                                    Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + "//dataAsPDF.pdf",
            //                                    Microsoft.Office.Interop.Excel.XlFixedFormatQuality.xlQualityStandard,
            //                                    true, true, 1, 10, false);
        }

我的问题是，当使用外部 window 保存时，它保存正确...但是作为一个空文件，就像完全是空的（用记事本打开它显示一个空文件）

知道我的问题是什么吗？

谢谢！

Answer 1

这是一个通用代码示例，它创建一个新文件，重命名 sheet，添加一个 sheet，然后将第一个 sheet 单元格 A1 的文本设置为 Hello Excel.

Excel class

using System;
using System.Diagnostics;
using System.Linq;
using System.IO;
using System.Runtime.InteropServices;
using Excel = Microsoft.Office.Interop.Excel;

namespace ExcelInteropApp.Classes
{
    public class ExcelOperations
    {
        public delegate void OnAction(string sender);
        public static event OnAction ActionHandler;
        /// <summary>
        /// create an excel file, rename sheet1 (default sheet),
        /// create another worksheet, rename it and re-order to end.
        /// </summary>
        /// <param name="fileName">path and file name for excel file</param>
        /// <param name="firstWorkSheetName">name for default sheet</param>
        /// <param name="secondWorkSheetName">name for newly added sheet</param>
        public static (bool success, Exception exception) CreateExcelFile(string fileName, string firstWorkSheetName, string secondWorkSheetName, bool open)
        {
            try
            {
                if (File.Exists(fileName))
                {
                    File.Delete(fileName);
                }

                Excel.Application xlApp;
                Excel.Workbooks xlWorkBooks;
                Excel.Workbook xlWorkBook;
                Excel.Worksheet xlWorkSheet;
                Excel.Sheets xlWorkSheets;
                
                
                xlApp = new Excel.Application { DisplayAlerts = false };

                xlWorkBooks = xlApp.Workbooks;
                xlWorkBook = xlWorkBooks.Add();

                xlWorkSheets = xlWorkBook.Sheets;


                xlWorkSheet = (Excel.Worksheet)xlWorkSheets[1];
                xlWorkSheet.Name = firstWorkSheetName;

                ActionHandler?.Invoke("renamed first sheet");
                
                Excel.Worksheet xlNewSheet = (Excel.Worksheet)xlWorkSheets
                    .Add(xlWorkSheets[1], 
                        Type.Missing, 
                        Type.Missing, 
                        Type.Missing);

                xlNewSheet.Move(System.Reflection.Missing.Value, xlWorkSheets[xlWorkSheets.Count]);

                xlNewSheet.Name = secondWorkSheetName;

                Excel.Range xlRange1 = null;
                xlRange1 = xlWorkSheet.Range["A1"];
                xlRange1.Value = "Hello Excel";
                Marshal.FinalReleaseComObject(xlRange1);
                xlRange1 = null;

                ActionHandler?.Invoke("Done with add sheet");

                Marshal.FinalReleaseComObject(xlNewSheet);
                xlNewSheet = null;
                xlWorkBook.SaveAs(fileName);

                ActionHandler?.Invoke("Saved file");

                xlWorkBook.Close();
                xlApp.UserControl = true;
                xlApp.Quit();

                Marshal.FinalReleaseComObject(xlWorkSheets);
                xlWorkSheets = null;

                Marshal.FinalReleaseComObject(xlWorkSheet);
                xlWorkSheet = null;

                Marshal.FinalReleaseComObject(xlWorkBook);
                xlWorkBook = null;

                Marshal.FinalReleaseComObject(xlWorkBooks);
                xlWorkBooks = null;

                Marshal.FinalReleaseComObject(xlApp);
                xlApp = null;

                ActionHandler?.Invoke($"Clean-up: {(Process.GetProcesses().Any((p) => p.ProcessName.Contains("EXCEL")) ? "Released" : "Not released")}");

                if (open)
                {
                    ActionHandler?.Invoke("Opening");
                    Process.Start(fileName);
                }
                else
                {
                    ActionHandler?.Invoke("Not opening");
                }
                
                return (true, null);
            }
            catch (Exception exception)
            {
                return (false, exception);
            }
        }


    }
}

表单代码，一个按钮和一个列表框

using System;
using System.IO;
using System.Windows.Forms;
using ExcelInteropApp.Classes;

namespace ExcelInteropApp
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void CreateExcelButton1_Click(object sender, EventArgs e)
        {
            listBox1.Items.Clear();
            ExcelOperations.ActionHandler += ExcelOperationsOnActionHandler;
            string fileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Demo.xlsx");
            string firstSheet = "Karen";
            string secondSheet = "Karen 1";
            
            var (success, exception) = ExcelOperations.CreateExcelFile(fileName,firstSheet, secondSheet, openWhenDoneCheckBox.Checked);
            if (success == false)
            {
                Console.WriteLine(exception.Message);
            }

            ExcelOperations.ActionHandler -= ExcelOperationsOnActionHandler;

        }

        private void ExcelOperationsOnActionHandler(string sender)
        {
            listBox1.Items.Add(sender);
        }

    }
}

c# data to excel 导出给出空文件

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