如何使用C＃将.xls文件转换为.xlsx并且未安装Microsoft Office？

Question

我需要将使用C＃将.xls文件转换为.xlsx而不使用Microsoft Office的帮助。

Answer 1

通过一些编码工作，您可以使用NPOI库来读取XLS数据并将其写回为XLSX。

另一种方式（XLSX到XLS）显示在Convert xlsx file to xls using NPOI in c#中。这可能是看到原则的一个很好的起点。

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); 
     }