如何使用EPPlus库在SharePoint 2013网站上阅读和更新Excel文档

Question

我要从SharePoint 2013文档库下载一个excel文件。将其写入内存流并将其加载到Excel Package之后，我想对excel工作表进行修改并将文档保存到库中。

下面是我到目前为止的代码

 using (var clientContext = new ClientContext("https://url/"))
        {
            Web web = clientContext.Web;
            clientContext.Load(web);
            clientContext.ExecuteQuery();

            string url = web.ServerRelativeUrl;
Microsoft.SharePoint.Client.File file = web.GetFileByServerRelativeUrl(url + "/Shared/Test.xlsx");


            ClientResult<System.IO.Stream> data = file.OpenBinaryStream();
            clientContext.Load(file);
            clientContext.ExecuteQuery();

            MemoryStream mStream = new MemoryStream();
            data.Value.CopyTo(mStream);


            using (var ws = new OfficeOpenXml.ExcelPackage(mStream))
            {
  ExcelWorksheet sheet = ws.Workbook.Worksheets.First();

                        sheet.Cells[1, 1].Value = "Test";

                        ws.Save() 
                        var stream = new MemoryStream(ws.GetAsByteArray()); **'Getting an error here'**

                        string fileUrl = url + "/Shared/Test.xlsx";

                        Microsoft.SharePoint.Client.File.SaveBinaryDirect(clientContext, fileUrl, stream, true);
   }
  }
 }

有人可以帮忙吗！