C# 如何合并Excel工作表

using Spire.Xls;

namespace MergeWorksheet_XLS
{
    class Program
    {
        static void Main(string[] args)
        {
            //创建一个Workbook类对象
            Workbook newbook = new Workbook();
            newbook.Version = ExcelVersion.Version2013;
            //删除文档中的工作表（新创建的文档默认包含3张工作表）
            newbook.Worksheets.Clear();

            //创建一个临时的workbook，用于加载需要合并的Excel文档
            Workbook tempbook = new Workbook();

            //加载需要合并的Excel文档保存到数组
            string[] excelFiles = new string[] { @"C:\Users\Administrator\Desktop\test.xlsx", @"C:\Users\Administrator\Desktop\sample.xlsx" };

            //遍历数组
            for (int i = 0; i < excelFiles.Length; i++)
            {
                //载入Excel文档
                tempbook.LoadFromFile(excelFiles[i]);
                //调用AddCopy方法，将文档中所有工作表添加到新的workbook
                foreach (Worksheet sheet in tempbook.Worksheets)
                {
                    newbook.Worksheets.AddCopy(sheet);
                }
            }
            //保存文档
            newbook.SaveToFile("MergeFiles.xlsx", ExcelVersion.Version2013);            
        }
    }
}

using Spire.Xls;

namespace MergeWorksheetsToOne_XLS
{
    class Program
    {
        static void Main(string[] args)
        {
            //实例化一个Workbook类，加载Excel文档
            Workbook workbook = new Workbook();
            workbook.LoadFromFile(@"C:\Users\Administrator\Desktop\test.xlsx");

            //获取第1、2张工作表
            Worksheet sheet1 = workbook.Worksheets[0];
            Worksheet sheet2 = workbook.Worksheets[1];

            //复制第2张工作表内容到第1张工作表的指定区域中
            sheet2.AllocatedRange.Copy(sheet1.Range[sheet1.LastRow +3, 1]);

            //删除第2张工作表
           sheet2.Remove();
            //重命名的工作表1
           sheet1.Name = "外贸单证";

            //保存并运行文档
           workbook.SaveToFile("MergeSheets.xlsx", ExcelVersion.Version2013);
           System.Diagnostics.Process.Start("MergeSheets.xlsx");
        }
    }
}