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Sharepoint Products and Technologies DoesUserHavePermissions() Bug
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I was working on a SharePoint WebPart to display a list of the document libraries that
a user had access to. I needed this for a proposal portal that I was working on
and only certain user groups would have access to specific documents in the Windows
SharePoint Services (WSS) site. This could be used for any business really.
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I created my SharePoint WebPart and was looking for a way to detect if a user had
access to a document library. I found the DoesUserHavePermission() function in
the SPPermissionCollection class of the SharePoint object model. I read the documentation
to see what values were returned and as I thought it was going to be true or
false. I quickly realized that this function doesn't return a false value as
the documentation says. It will return a true value if the user has permissions
to the library. When the user doesn't have permissions to the library an
AccessDeniedException is thrown that is, by default, caught by Windows
SharePoint Services (WSS) and the user is prompted for their credentials.
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Currently there is not a “solution” for this problem but there is a work
around.
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To make this work two things need to be done, the first being that the
CatchAccessDeniedException property of the SPSites class is set to false.
Setting this property to false will allow the exception to pass through WSS and
not cause the user to be prompted for their credentials. The second thing to do
is to catch System.UnauthorizedAccessException.
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For an example of how to implement this in code see my article on creating
the document library view web part: Code Example of WorkAround
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