如何在未安装 Microsoft Office 的情况下使用 C# 将 .xls 文件转换为 .xlsx？

Question

我需要帮助使用 C# 将 a.xls 文件转换为 .xlsx，而不使用 Microsoft Office。

Answer 1

通过一些编码工作，您可以使用NPOI库读取XLS数据并将其写回XLSX。

在c＃中使用NPOI将xlsx文件转换为xls中显示了另一种方法（从XLSX到XLS）。 这可能是了解该原理的一个很好的起点。

Answer 2

使用下面的查询，

private static string GetConnectionString()
    {
        Dictionary<string, string> props = new Dictionary<string, string>();

        // XLSX - Excel 2007, 2010, 2012, 2013
        props["Provider"] = "Microsoft.ACE.OLEDB.12.0;";
        props["Extended Properties"] = "Excel 12.0 XML";
        props["Data Source"] = @"D:\data\users\liran-fr\Desktop\Excel\Received\Orbotech_FW__ARTEMIS-CONTROL-AG__223227__0408141043__95546.xls";

        // XLS - Excel 2003 and Older
        //props["Provider"] = "Microsoft.Jet.OLEDB.4.0";
        //props["Extended Properties"] = "Excel 8.0";
        //props["Data Source"] = "C:\\MyExcel.xls";

        StringBuilder sb = new StringBuilder();

        foreach (KeyValuePair<string, string> prop in props)
        {
            sb.Append(prop.Key);
            sb.Append('=');
            sb.Append(prop.Value);
            sb.Append(';');
        }

        return sb.ToString();
    }

    private static DataSet ReadExcelFile()
    {
        DataSet ds = new DataSet();

        string connectionString = GetConnectionString();

        using (OleDbConnection conn = new OleDbConnection(connectionString))
        {
            conn.Open();
            OleDbCommand cmd = new OleDbCommand();
            cmd.Connection = conn;

            // Get all Sheets in Excel File
            DataTable dtSheet = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

            // Loop through all Sheets to get data
            foreach (DataRow dr in dtSheet.Rows)
            {
                string sheetName = dr["TABLE_NAME"].ToString();

                //if (!sheetName.EndsWith("$"))
                //    continue;

                // Get all rows from the Sheet
                cmd.CommandText = "SELECT * FROM [" + sheetName + "]";

                DataTable dt = new DataTable();
                dt.TableName = sheetName;

                OleDbDataAdapter da = new OleDbDataAdapter(cmd);
                da.Fill(dt);

                ds.Tables.Add(dt);
            }

            cmd = null;
            conn.Close();
        }

        return ds;
    }
using (ExcelPackage epackage = new ExcelPackage())
        {
            ExcelWorksheet excel = epackage.Workbook.Worksheets.Add("ExcelTabName");
            DataSet ds = ReadExcelFile();
            DataTable dtbl = ds.Tables[0];
            excel.Cells["A1"].LoadFromDataTable(dtbl, true);
            System.IO.FileInfo file = new System.IO.FileInfo(@"D:\data\users\liran-fr\Desktop\Excel\Received\test.xlsx");
            epackage.SaveAs(file);
        }

Answer 3

我发布了这个给我留下深刻印象的答案，直到我看到这个链接，它更好更简单：

我知道这个问题已经被问到并得到了回答，但这是我从别人那里借来的……抱歉，我不能给予信任，因为我不知道我是怎么想到这个主意的，但是在 C# 中，创建一个过程来复制文件从 xls 到 xlsx。 没有大惊小怪，没有混乱。 这是在 .Net Core 6.0 和 o365 中。

最终，您在此过程中运行的字符串（也称为命令提示符）应类似于以下内容：

"C:\Program Files (x86)\Microsoft Office\root\Office16\excelcnv.exe" -oice "\Share\Folder\Cash.xls" "\Share\Folder\Cash.xlsx"

public static class Xls2XlsxCmdProcess
{ 
    
    public static string processDirectory = @"C:\Program Files (x86)\Microsoft Office\root\Office16\";

    public static void ExecuteCommandSync(string pathToExe, string command)
    {
        
        var procStartInfo = new ProcessStartInfo(pathToExe, command)
        {
            WorkingDirectory = processDirectory,
            CreateNoWindow = false,
            UseShellExecute = false,
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            RedirectStandardInput = true
        };

        var proc = new Process { StartInfo = procStartInfo };
        proc.Start();

        //proc.StandardInput.WriteLine(password);//If the app that requires a password or other params, they can be added here as a string.
        proc.StandardInput.Flush();

        // Get the output into a string
        string result = proc.StandardOutput.ReadToEnd();
        string error = proc.StandardError.ReadToEnd();

        Console.WriteLine(result);
        Console.WriteLine(error);
    }
}

要调用它，请指定您的所有参数、您的工作目录，然后您就可以开始比赛了！！！

        string baseFolder = @"\\Share\folder\";
        string fileNameCash = "Cash.xls";
        string fileNameDV = "DailyValue.xls";
        string fileNameCashOutput = "Cash.xlsx";
        string fileNameDVOutput = "DailyValue.xlsx";
        //Create cash & dailyValue as xlsx files (for ease of use with EPPlus4)
        string pathToExe = @"C:\Program Files (x86)\Microsoft Office\root\Office16\excelcnv.exe";//Path to office XLS to XLSX Conversion Tool for o365 - You can find a similar version by searching for the excelcnv.exe within "C:\Program Files (x86)\Microsoft Office" folder.
        string commandFormat1 = string.Format(@"""{0}"" -oice ""{1}{2}"" ""{3}{4}"" ",pathToExe, @BaseFolder, fileNameCash,@BaseFolder,fileNameCashOutput);
        Xls2XlsxCmdProcess.ExecuteCommandSync(pathToExe, string.Format(commandFormat1));