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SPPrincipal Class

SharePoint 2010

Represents a user or group that can be assigned permissions in Microsoft SharePoint Foundation to control security.

System.Object
  Microsoft.SharePoint.SPMember
    Microsoft.SharePoint.SPPrincipal
      Microsoft.SharePoint.SPGroup
      Microsoft.SharePoint.SPUser

Namespace:  Microsoft.SharePoint
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: Yes
Available in SharePoint Online
C#
VB
Copy 
[SubsetCallableTypeAttribute]
[ClientCallableTypeAttribute(Name = "Principal", ServerTypeId = "{8a76e712-17a1-4a40-b2df-cca7c060d78f}")]
public abstract class SPPrincipal : SPMember

When a user or group is added to a site, the user or group is the principal. The SPPrincipal object can represent one of the following types of users or groups:

  • Windows user

  • Windows group

  • Non-Windows user (provided through ASP.NET membership provider)

  • Non-Windows group (provided through ASP.NET roles provider)

  • SharePoint groups

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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Claims Based Principals are missing
The list of potential principals appears to be missing those coming in in a Claims based scenario. The implication here is that users can only originate from Windows or .NET Authentication Providers. Possibly it has not been reworked from the 2007 docs.
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