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What does Web.SiteUsers (CSOM) include exactly?

ManageEngine SharePoint Manager Plus 21 Reputation points
2023-08-17T05:47:06.4766667+00:00

Recently I come across an issue that Web.SiteUsers listed the users those who are not present in the SiteUserInformationList of specific site collection (/_catalogs/users/simple.aspx). I am bit confused about this one. Can anyone help me to figure out what this CSOM API include exactly? Thanks in advance.

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  1. RaytheonXie_MSFT 40,426 Reputation points Microsoft External Staff
    2023-08-17T06:52:29.0433333+00:00

    Hi @unknown_25,

    As far as I know, Web.SiteUsers doesn't get all the users from User Information List, but get most of the list.

    SiteUsers includes users who have a relationship with the site (have access or used to have access to this site/item, or assigned with an item .etc). Once it establishes the relationship, it will be resolved as a user entity in the collection.

    In the past, it doesn't include users who have access due to group membership but haven't used that access yet. From SP2013, It has been changed a little bit, SiteUsers will contain the user as soon as you give them permission to site regardless of they logon this site or not. If a user have access to the site but haven't been logged in the site or ensured. The user will not exist in User Information List but SiteUsers will contain the user.

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