OnDoc/DOCGEN/Klassen/SyndFExcel.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Syncfusion.XlsIO;

namespace DOCGEN.Klassen
{
    public class SynFExcel
    {
        public bool create_nativ(string property, string value, string base64, string originalfile, string destfile)
        {
            FileStream ms = new FileStream(originalfile, FileMode.Open, FileAccess.Read);
            FileStream os = new FileStream(destfile, FileMode.Create);
            ExcelEngine ex = new ExcelEngine();
            IApplication application = ex.Excel;
            IWorkbook workbook = application.Workbooks.Open(ms);

            try
            {
                workbook.CustomDocumentProperties[property].Text = value;
            }
            catch
            {
                workbook.CustomDocumentProperties.Remove(property);
                workbook.CustomDocumentProperties[property].Text = value;

            }
            workbook.SaveAs(os);
            workbook.Close();
            workbook = null;
            application = null;
            ms.Close();
            ms.Dispose();
            os.Close();
            os.Dispose();
            return true;

        }
    }
}