Scenario:
On a custom application page, when you are trying to get to SPWeb or SPSite object from SPContext, you got following error
Error : Object Reference not sent to an instance of an object.
Solution:
This can be because of :
-- First reason can be Web / Site Collection itself is missing. Make sure you can access the web's default page before calling the custom application page in its context.
If you are trying to get to ( http://localhost/sites/test/_layouts/client/customPage.aspx ) and this getting error, make sure you can get to ( http://localhost/sites/test/default.aspx )
-- If you using Form Authentication and trying to get the SPWeb / SPSite object from a page which is not authenticated ( usually these are the pages inheriting from UnSecuredLayoutPage class ), then you can get this error.
Solution:
ASP.Net Zindabad . you need to use the SMTPClient to send email for all such pages which can be accessed without Authentication ..like Login.aspx
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3 comments:
In general, what is the advantage of creating a feature and deploying it, as against adding a aspx page with .cs file under a folder in _layouts? This aspx may not have the sharepoint type look? If all u need is some processing using SharePoint OM without any UI then I thing its the best/easiest way. I've implemented a redirector typr of functionality where user can access documents using GUID. We expose the Doc GUID as its metadata and user can point to the doc using URL to the _layouts aspx page. in the aspx, we just make a call to SP OM, get the file using the GUID and redirect to the resultant URL of the list item.
You can do error handling also on the page and in case of error , you can display a nice message on the page using sharepoint type look and feel
Thanks. So what is better from SharePoint perspective? a feature with DLL going to GAC or a folder with aspx and cs files int it? I know feature gets displayed as something installed in sharepoint UI, this page may not, but that should not be a huge thing.
Also how different this page would be if we compare it to a web part?
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