enumerating RoleAssigments and RoleDefinitions of all items

[EmkioA]

Hello, i have a small code enumerating roleassignements, and i want to know for who the roledefinitions are assigned to... Into the iRoleAssignments we have access to the PrincipaleId but how can i know if this id is a user or a group?

Example : i receive a PrincipaleId = 3 and if i lookinto the web.GetUserById(3) i receive an error (not found). and if i look on the site and i click on the groupe name, i am redirect to /_layouts/15/people.aspx?MembershipGroupId=3

How can i distinct Users from Groups into the IRoleAssigments?

[jansenbe]

@EmkioA : probably the fastest solution is to lookup the SharePoint groups upfront and then check whether the principal id matches with one of the group id's.

[EmkioA]

@jansenbe Thank you for the answer,

I have think of it, but what i do if both id matches? if y have a groupid 3 and a userid 3 too? wich one i choose?

There is a PrincipalType enum but i cant find any link between the IRoleAssigment, IRoleDefinition and PrincipalType i am missing something?

[jansenbe]

PrincipalId should be unique

[EmkioA]

what make me unsure is they are into 2 separates collection
iWeb.SiteGroups and iWeb.SiteUsers

[jansenbe]

They are unique