问有没有什么简单的方法可以把.xls文件转换成.csv文件？(Excel)

EN

using ExcelDataReader;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace YourProjectNameSpace
{
    public class ExcelFileHelper
    {

        /// <summary>
        /// Converts a given XLS into CSV file format.
        /// </summary>
        public static bool SaveAsCsv(string excelFilePath, string destinationCsvFilePath)
        {

            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

            using (var stream = new FileStream(excelFilePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
            {
                IExcelDataReader reader = null;
                if (excelFilePath.EndsWith(".xls"))
                {
                    reader = ExcelReaderFactory.CreateBinaryReader(stream);
                }
                else if (excelFilePath.EndsWith(".xlsx"))
                {
                    reader = ExcelReaderFactory.CreateOpenXmlReader(stream);
                }

                if (reader == null)
                    return false;

                var ds = reader.AsDataSet(new ExcelDataSetConfiguration()
                {
                    ConfigureDataTable = (tableReader) => new ExcelDataTableConfiguration()
                    {
                        UseHeaderRow = false
                    }
                });

                var csvContent = string.Empty;
                int row_no = 0;
                while (row_no < ds.Tables[0].Rows.Count)
                {
                    var arr = new List<string>();
                    for (int i = 0; i < ds.Tables[0].Columns.Count; i++)
                    {
                        arr.Add(ds.Tables[0].Rows[row_no][i].ToString());
                    }
                    row_no++;
                    csvContent += string.Join(",", arr) + "\n";
                }
                StreamWriter csv = new StreamWriter(destinationCsvFilePath, false);
                csv.Write(csvContent);
                csv.Close();
                return true;
            }
        }
    }
}

Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

var execPath = Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase)?.Replace("file:\\", "");
    
string FileNameXLS = "\\file.xls";
string FileNameCSV = "\\file.csv";
        
Console.WriteLine("Exporting file to CSV...." + "\n");
ExcelFileHelper.SaveAsCsv(execPath + FileNameXLS, execPath + FileNameCSV);
Console.WriteLine("File exported to CSV!" + "\n");