'Saving Aspose.Slides.Presentation prevents file from being opened

I am attempting to modify a Presentation file with Aspose.Slides.

var fileMemoryStream = new MemoryStream();
await fileMemoryStream.WriteAsync(file.FileData, 0, file.FileData.Length);

Presentation pres = new Presentation(fileMemoryStream);
IDocumentProperties pptProperties = pres.DocumentProperties;
pptProperties.Title = "test";

pres.Save(fileMemoryStream, Aspose.Slides.Export.SaveFormat.Pptx);

fileMemoryStream.Position = 0;
fileData = fileMemoryStream.ToArray();
var contentType = fileProperties.MimeTypes.ContainsKey(file.Extension) ? fileProperties.MimeTypes[file.Extension]: "application"+file.Extension.Replace(".", "/");
var fileConvert = File(fileData, contentType, exemplarFile.DownloadName + file.Extension);

Ff I comment out the pres.Save line, the file works. If I don't, it won't open and I'm left with the message below.

"Powerpoint found a problem with content in path.pptx. Powerpoint can attempt to repair the presentation."

If I comment out pptProperties.Title = "test";, it does not work. setting the fileMemoryStream to zero at the beginning does not work. I must be missing a step in the Aspose process, or the memorystream process. Any ideas?

Note: the file being tested is a pptx file and the Mimetype is correct

application/vnd.openxmlformats-officedocument.presentationml.presentation

aspose


Solution 1:[1]

I'm not sure what was happening, but saving the pres to a new MemoryStream instead of the current one worked.

If anyone has an idea as to why this is feel free to post, but this is what solved this.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 alrightgame

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