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Does every user that belongs to a site collection or a group in that site collection, have a user.ID?

I am iterating through a list of SPFieldUserValueCollection and am comparing the SPFieldUserValue.User.ID with the SPContext.Current.Web.CurrentUser.ID and want to make sure they will compare accurately.

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Yes, every user will have an ID. SPUser.ID is the integer ID of the user in the site collection. However, the ID is specific only to that specific site collection.

I would recommend using SPUser.LoginName instead.

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SPUser.ID only refers to the Item ID of their entry in that site collection's User Information List, so it's never guaranteed to be unique across a farm.

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  • I understand it might not be unique across farms, but do you know if ever user in that farm will have an ID regardless if they are a member of the farm or just member of a group that belongs to the farm?
    – Meyer Denney
    Commented Jun 7, 2011 at 23:04
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    I would clarify that it isn't even unique across site collections.
    – Kit Menke
    Commented Jun 7, 2011 at 23:53
  • @Kit yeah, that's what I meant, though I guess how I wrote it could infer that I meant that it could be unique within a web app. Which it isn't. :)
    – James Love
    Commented Jun 8, 2011 at 7:15

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