Moving large files with modern authentication

Question

I am trying move files from one site collection to another. Following code works for smaller files but not for large files due to memory exceptions:

if (item.FileSystemObjectType == FileSystemObjectType.File) { var fileName = item["FileLeafRef"] as string; var fileSize = item["File_x0020_Size"]; item.Context.Load(item.File); using (var stream = item.File.OpenBinaryStream().Value) { item.Context.ExecuteQueryWithIncrementalRetry(3, logger); var fi = new FileCreationInformation(); fi.ContentStream = stream; fi.Url = fileName; fi.Overwrite = true; folder.Files.Add(fi); destLibrary.Context.ExecuteQueryWithIncrementalRetry(3, logger); } }

Is there anyway to to the same in batches? Notice SaveBinary etc cannot be used with modern authentication.

Did you try recommendations in docs.microsoft.com/en-us/sharepoint/dev/solution-guidance/…? — Slaven Semper
– Slaven Semper, Commented Oct 13, 2019 at 4:34
Thanks. Yes I read that article, but it is based on uploading a file from disk. I havent found a sample where you can do OpenBinaryStream in batches. Options 3 would be the prefered one but from memory only. — Thomas Segato
– Thomas Segato, Commented Oct 13, 2019 at 8:48

Thomas Segato · Accepted Answer · 2019-10-25 20:54:24Z

This one solves the problem:

https://docs.microsoft.com/en-us/previous-versions/office/sharepoint-csom/mt796381(v%3Doffice.15)

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