如何使用C＃将.xls文件转换为.xlsx，而不安装Microsoft Office？

我需要使用C＃将.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库来读取XLS数据并将其写回XLSX。

反过来（XLSX到XLS）显示在转换xlsx文件xls在c＃中使用NPOI 。 看到这个原则可能是一个很好的起点。

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); }