如何将数据导出到 Excel 文件

Question

我有一个 Excel 文件，其中包含数据。我想将其中的一些特定行写入我通过代码创建的另一个 Excel 文件中。顺便说一下，我在列表中有这些行的索引。我怎样才能做到这一点？

Answer 1

MS 提供 OpenXML SDK V 2.5 - 请参阅 https:/ /msdn.microsoft.com/en-us/library/bb448854(v=office.15).aspx

这可以读取+写入 MS Office 文件（包括 Excel）...

另一个选项请参见http://www.codeproject.com/KB/office/OpenXML.aspx

如果您需要更多像渲染、公式等。然后有不同的商业库，如 Aspose 和 Flexcel...

Answer 2

 private void button1_Click(object sender, EventArgs e)
    {
        Excel.Application xlApp ;
        Excel.Workbook xlWorkBook ;
        Excel.Worksheet xlWorkSheet ;
        object misValue = System.Reflection.Missing.Value;

        xlApp = new Excel.ApplicationClass();
        xlWorkBook = xlApp.Workbooks.Add(misValue);

        xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
        xlWorkSheet.Cells[1, 1] = "http://csharp.net-informations.com";

        xlWorkBook.SaveAs("csharp-Excel.xls", Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
        xlWorkBook.Close(true, misValue, misValue);
        xlApp.Quit();

        releaseObject(xlWorkSheet);
        releaseObject(xlWorkBook);
        releaseObject(xlApp);

        MessageBox.Show("Excel file created , you can find the file c:\\csharp-Excel.xls");
    }

    private void releaseObject(object obj)
    {
        try
        {
            System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
            obj = null;
        }
        catch (Exception ex)
        {
            obj = null;
            MessageBox.Show("Exception Occured while releasing object " + ex.ToString());
        }
        finally
        {
            GC.Collect();
        }
    }

以上代码直接摘自csharp.net请采纳上网站看看。

Answer 3

您是否听说过 NPOI，这是一个无需安装 Microsoft Office 即可读取/写入 Office 格式的 .NET 库。没有 COM+，就没有互操作。 Github 页面

这是我的 Excel 导出类

/*
 * User: TMPCSigit [email protected]
 * Date: 25/11/2019
 * Time: 11:28
 * 
 */
using System;
using System.IO;
using System.Text.RegularExpressions;
using System.Windows.Forms;

using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;

namespace Employee_Manager
{
    public static class ExportHelper
    {       
        public static void WriteCell( ISheet sheet, int columnIndex, int rowIndex, string value )
        {
            var row = sheet.GetRow( rowIndex ) ?? sheet.CreateRow( rowIndex );
            var cell = row.GetCell( columnIndex ) ?? row.CreateCell( columnIndex );

            cell.SetCellValue( value );
        }
        public static void WriteCell( ISheet sheet, int columnIndex, int rowIndex, double value )
        {
            var row = sheet.GetRow( rowIndex ) ?? sheet.CreateRow( rowIndex );
            var cell = row.GetCell( columnIndex ) ?? row.CreateCell( columnIndex );

            cell.SetCellValue( value );
        }
        public static void WriteCell( ISheet sheet, int columnIndex, int rowIndex, DateTime value )
        {
            var row = sheet.GetRow( rowIndex ) ?? sheet.CreateRow( rowIndex );
            var cell = row.GetCell( columnIndex ) ?? row.CreateCell( columnIndex );

            cell.SetCellValue( value );
        }
        public static void WriteStyle( ISheet sheet, int columnIndex, int rowIndex, ICellStyle style )
        {
            var row = sheet.GetRow( rowIndex ) ?? sheet.CreateRow( rowIndex );
            var cell = row.GetCell( columnIndex ) ?? row.CreateCell( columnIndex );

            cell.CellStyle = style;
        }

        public static IWorkbook CreateNewBook( string filePath )
        {
            IWorkbook book;
            var extension = Path.GetExtension( filePath );

            // HSSF => Microsoft Excel(xls形式)(excel 97-2003)
            // XSSF => Office Open XML Workbook形式(xlsx形式)(excel 2007以降)
            if( extension == ".xls" ) {
                book = new HSSFWorkbook();
            }
            else if( extension == ".xlsx" ) {
                book = new XSSFWorkbook();
            }
            else {
                throw new ApplicationException( "CreateNewBook: invalid extension" );
            }

            return book;
        }
        public static void createXls(DataGridView dg){
            try {
                string filePath = "";
                SaveFileDialog sfd = new SaveFileDialog();
                sfd.Filter = "Excel XLS (*.xls)|*.xls";
                sfd.FileName = "Export.xls";
                if (sfd.ShowDialog() == DialogResult.OK)
                {
                    filePath = sfd.FileName;
                    var book = CreateNewBook( filePath );
                    book.CreateSheet( "Employee" );
                    var sheet = book.GetSheet( "Employee" );
                    int columnCount = dg.ColumnCount;
                    string columnNames = "";
                    string[] output = new string[dg.RowCount + 1];
                    for (int i = 0; i < columnCount; i++)
                    {
                        WriteCell( sheet, i, 0, SplitCamelCase(dg.Columns[i].Name.ToString()) );
                    }
                    for (int i = 0; i < dg.RowCount; i++)
                    {
                        for (int j = 0; j < columnCount; j++)
                        {
                            var celData =  dg.Rows[i].Cells[j].Value;
                            if(celData == "" || celData == null){
                                celData = "-";
                            }
                            if(celData.ToString() == "System.Drawing.Bitmap"){
                                celData = "Ada";
                            }
                            WriteCell( sheet, j, i+1, celData.ToString() );
                        }
                    }
                    var style = book.CreateCellStyle();
                    style.DataFormat = book.CreateDataFormat().GetFormat( "yyyy/mm/dd" );
                    WriteStyle( sheet, 0, 4, style );
                    using( var fs = new FileStream( filePath, FileMode.Create ) ) {
                        book.Write( fs );
                    }
                }
            }
            catch( Exception ex ) {
                Console.WriteLine( ex );
            }
        }
        public static string SplitCamelCase(string input)
        {
            return Regex.Replace(input, "(?<=[a-z])([A-Z])", " $1", RegexOptions.Compiled);
        }
    }
}

Answer 4

您可以使用 ExcelDataReader 读取现有的 Excel 文件：

using (var stream = File.Open("C:\\temp\\input.xlsx", FileMode.Open, FileAccess.Read))
{
    using (var reader = ExcelReaderFactory.CreateReader(stream))
    {
        while (reader.Read())
        {
            for (var i = 0; i < reader.FieldCount; i++)
            {
                var value = reader.GetValue(i)?.ToString();
            }
        }
    }
}

收集所有数据后如果需要，您可以尝试我的 SwiftExcel 库将其导出到新的 Excel 文件：

using (var ew = new ExcelWriter("C:\\temp\\output.xlsx"))
{
    for (var i = 1; i < 10; i++)
    {
        ew.Write("your_data", i, 1);
    }
}

用于安装这两个库的 Nuget 命令：

安装包ExcelDataReader

安装包 SwiftExcel

Answer 5

我使用互操作打开 Excel 并在数据完成后修改列宽。如果您使用互操作将数据吐入新的 Excel 工作簿（如果这是您想要的），那么速度会非常慢。相反，我生成了 .CSV，然后在 Excel 中打开 .CSV。这有其自身的问题，但我发现这是最快的方法。

首先，转换 .CSV：

// Convert array data into CSV format.
// Modified from http://csharphelper.com/blog/2018/04/write-a-csv-file-from-an-array-in-c/.
private string GetCSV(List<string> Headers, List<List<double>> Data)
{
    // Get the bounds.
    var rows = Data[0].Count;
    var cols = Data.Count;
    var row = 0;

    // Convert the array into a CSV string.
    StringBuilder sb = new StringBuilder();

    // Add the first field in this row.
    sb.Append(Headers[0]);

    // Add the other fields in this row separated by commas.
    for (int col = 1; col < cols; col++)
        sb.Append("," + Headers[col]);

    // Move to the next line.
    sb.AppendLine();

    for (row = 0; row < rows; row++)
    {
        // Add the first field in this row.
        sb.Append(Data[0][row]);

        // Add the other fields in this row separated by commas.
        for (int col = 1; col < cols; col++)
            sb.Append("," + Data[col][row]);

        // Move to the next line.
        sb.AppendLine();
    }

    // Return the CSV format string.
    return sb.ToString();
}

然后，将其导出到 Excel：

public void ExportToExcel()
{
    // Initialize app and pop Excel on the screen.
    var excelApp = new Excel.Application { Visible = true };

    // I use unix time to give the files a unique name that's almost somewhat useful.
    DateTime dateTime = DateTime.UtcNow;
    long unixTime = ((DateTimeOffset)dateTime).ToUnixTimeSeconds();
    var path = @"C:\Users\my\path\here" + unixTime + ".csv";

    var csv = GetCSV();
    File.WriteAllText(path, csv);

    // Create a new workbook and get its active sheet.
    excelApp.Workbooks.Open(path);

    var workSheet = (Excel.Worksheet)excelApp.ActiveSheet;
        
    // iterate over each value and throw it in the chart
    for (var column = 0; column < Data.Count; column++)
    {
        ((Excel.Range)workSheet.Columns[column + 1]).AutoFit();
    }

    currentSheet = workSheet;
}

您还必须安装一些东西...

1. 右键单击解决方案资源管理器中的解决方案，然后选择“管理 NuGet”包裹。” - 添加Microsoft.Office.Interop.Excel

2. 如果您按照 interop 希望的方式创建项目，它现在可能实际上可以工作。如果它仍然不起作用，我必须在不同的类别中创建一个新项目。在新建>下项目，选择Visual C# > Windows 桌面 >控制台应用程序。否则，互操作工具将无法工作。

如果我忘记了什么，这是我的“使用”语句：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Excel = Microsoft.Office.Interop.Excel;

Answer 6

在使用 C# 将数据导出到 Excel 电子表格时，我也遇到了类似的问题。我尝试了许多不同的方法来处理外部 DLL，但没有成功。

对于导出功能，您不需要使用任何处理外部 DLL 的东西。相反，只需维护响应的标头和内容类型。

这是一篇我觉得很有帮助的文章。本文讨论如何使用 ASP.NET 将数据导出到 Excel 电子表格。

http://www.icodefor.net/2016/07/export-data-to-excel-sheet-in-asp-dot-net-c-sharp.html

Answer 7

使用 .NET 的 Aspose.Cells 库，您可以轻松导出特定行的数据以及从一个 Excel 文档到另一个 Excel 文档的列。以下代码示例展示了如何使用 C# 语言执行此操作。

// Open the source excel file.
Workbook srcWorkbook = new Workbook("Source_Workbook.xlsx");

// Create the destination excel file.
Workbook destWorkbook = new Workbook();
   
// Get the first worksheet of the source workbook.
Worksheet srcWorksheet = srcWorkbook.Worksheets[0];

// Get the first worksheet of the destination workbook.
Worksheet desWorksheet = destWorkbook.Worksheets[0];

// Copy the second row of the source Workbook to the first row of destination Workbook.
desWorksheet.Cells.CopyRow(srcWorksheet.Cells, 1, 0);

// Copy the fourth row of the source Workbook to the second row of destination Workbook.
desWorksheet.Cells.CopyRow(srcWorksheet.Cells, 3, 1);

// Save the destination excel file.
destWorkbook.Save("Destination_Workbook.xlsx");

以下博客文章详细介绍了如何将不同来源的数据导出到 Excel 文档。
https://blog.conholdate.com /2020/08/10/导出数据到excel-in-csharp/