Recognize file upload as a new version

Question

There's a major and minor versioned document library. Users may upload file with the same name existing in the document library, so it takes another minor version. Or users may edit the item in the document library by only changing item fields without uploading a file, so it takes another minor version as well.

I need to understand if user operation is a file upload? I use itemupdated event handling method. But I do not know where to control to understand whether it is a file upload or item editing?

Please help,

Thanks

Answer 1

It all depends on your versioning settings for the library and the options user chooses when it uploads:

• Versionining minor and major means every upload for a file with the same name becomes indeed a new version with every upload. A file upload indeed triggers multiple events, but you could account for a ItemAdded and ItemUpdated via a global variable and a Syncronous event (very important because otherwise). The issue is that you also you have the Properties dialog that shows between operations. I would strongly suggest you read this around the same subject

http://hristopavlov.wordpress.com/2009/02/24/understanding-sharepoint-event-receivers/

• User could choose to rename file if it exists in the upload dialog if versioning is not enabled. Also be aware that WebDav uploads via Explorer could impact you handler.

Answer 2

I tried to make Synchronization is Synchnronous for both ItemAdded and ItemUpdated. But a new version file upload does not trigger ItemAdded event. ItemAdded is called when only the first version file upload. So I cannot catch and carry the information(file upload) in a global variable.

Also what do you mean by Properties dialog?

Thanks