C#高效实现Excel与CSV的互相转换

Install-Package FreeSpire.XLS

using Spire.Xls;

class Program
{
    static void Main()
    {
        Workbook workbook = new Workbook();
        System.Console.WriteLine("已成功安装。");
    }
}

using Spire.Xls;
using System.Text;

namespace ConvertExcelToCsv
{
    class Program
    {
        static void Main(string[] args)
        {
            Workbook workbook = new Workbook();
            workbook.LoadFromFile("Sample.xlsx");

            Worksheet sheet = workbook.Worksheets[0];
            sheet.SaveToFile("ExcelToCSV.csv", ",", Encoding.UTF8);

            workbook.Close();
        }
    }
}

using Spire.Xls;

namespace ConvertCsvToExcel
{
    class Program
    {
        static void Main(string[] args)
        {
            Workbook workbook = new Workbook();
            workbook.LoadFromFile(@"ExcelToCSV.csv", ",", 1, 1);

            Worksheet sheet = workbook.Worksheets[0];
            CellRange usedRange = sheet.AllocatedRange;
            usedRange.IgnoreErrorOptions = IgnoreErrorType.NumberAsText;
            usedRange.AutoFitColumns();
            usedRange.AutoFitRows();

            workbook.SaveToFile("CSVToExcel.xlsx", ExcelVersion.Version2013);
            workbook.Close();
        }
    }
}

using Spire.Xls;
using System.IO;
using System.Text;

class BatchConvert
{
    static void Main()
    {
        string inputFolder = @"C:\InputExcels";
        string outputFolder = @"C:\OutputCSVs";

        foreach (string filePath in Directory.GetFiles(inputFolder, "*.xlsx"))
        {
            Workbook workbook = new Workbook();
            workbook.LoadFromFile(filePath);

            Worksheet sheet = workbook.Worksheets[0];
            string fileName = Path.GetFileNameWithoutExtension(filePath);

            sheet.SaveToFile(Path.Combine(outputFolder, fileName + ".csv"), ",", Encoding.UTF8);
            workbook.Close();
        }

        System.Console.WriteLine("批量转换完成。");
    }
}