Write to Excel file hosted on Sharepoint 2016 using EPPlus (C#)

问题

I'm trying for many days to write to an excel file without success.

The file is hosted on a sharepoint 2016 site which I am the administrator. I can read all the sheets of the file without any problem. But when I try to load it to an ExcelPackage variable, it seems, the stream length is 0.

You have details of what happening in the code comments. Do you have any idea of what I'm doing wrong ??

Any help will be appreciated. Here is the code :

public static ClientContext clientContext;
private static File dbFile;

public static void AddLine(string sheetName, ImputationLine newData)
{
    try
    {
        if (dbFile is null)
            LoadDb();

        ClientResult<IO.Stream> fileStream = dbFile.OpenBinaryStream();
        clientContext.Load(dbFile);
        clientContext.ExecuteQuery();

        ExcelPackage.LicenseContext = LicenseContext.NonCommercial;

        using (var package = new ExcelPackage())
        {
            using (IO.MemoryStream mStream = new IO.MemoryStream())
            {
                if (fileStream != null)
                {
                    fileStream.Value.CopyTo(mStream); // mStream is well populated with data from fileStream
                    package.Load(mStream); //No exception here but package.File is null, package.Stream.Length = 0

                    ExcelWorksheet worksheet = package.Workbook.Worksheets[sheetName]; //package.Workbook.Worksheets.Count = 0

                    int rowIndex = worksheet.Dimension.End.Row + 1;
                    for (int i = 0; i < newData.Values.Count; i++)
                    {
                        worksheet.Cells[rowIndex, i].Value = newData.Values[i];
                    }
                    package.Save();
                }
            }
        }

    }
    catch (Exception e)
    {
        throw e;
    }
}

private static void LoadDb()
{
    string subFolder = ConfigurationManager.AppSettings["SubFolder"];
    string dbFileName = ConfigurationManager.AppSettings["DbFileName"];
    List list = clientContext.Web.Lists.GetByTitle(ConfigurationManager.AppSettings["SpLibName"]);
    clientContext.Load(list.RootFolder);
    clientContext.ExecuteQuery();
    FileServerRelativeUrl = list.RootFolder.ServerRelativeUrl + subFolder + dbFileName;
    dbFile = clientContext.Web.GetFileByServerRelativeUrl(FileServerRelativeUrl);
}

Thank's for your replies !!

来源：https://stackoverflow.com/questions/62117472/write-to-excel-file-hosted-on-sharepoint-2016-using-epplus-c

标签

excel

sharepoint

epplus