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How could you programatically determine if code is running in an on-premise Sandbox model or SharePoint Online sandbox?

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Interesting Question. I am just trying to think of a scenario where you would require such a distinction to be made. SharePoint Online is just SharePoint Server hosted on the cloud so your solution should behave the same on both. Are you facing any differences? – Vardhaman Deshpande Oct 25 '12 at 15:33
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There are a few differences in what you can do - e.g. you can't use pretty much anything in Assembly namespace in Online - they have some extra validation/restriction over and above sandbox on premise. For my particular use case its about restrictions on different version for licensing. – Ryan Oct 25 '12 at 16:50

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A good comparison of them is here:

http://www.helpmeonsharepoint.com/2012/06/differences-between-sharepoint.html

As for checking the environment I would look for the _layouts/QuickShare.aspx

Since it is a SharePoint 365 only feature.

[update] Something like:

XslCompiledTransform.Load("https://<site>/_layouts/QuickShare.aspx", settings, resolver);

Should work right maybe not with outbound requests blocked? Okay it's messy but I can't think of another way that you can load a remote file on 365 at the moment.

But you could do something to throw it at the client side to update a local list?

[note] When the new version comes out, you will be able to do things like this much easier!

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How would you look for _layouts/QuickShare.aspx in the sandbox model on SharePoint Online? – Ryan Nov 2 '12 at 17:09
Updated for an idea, I didn't have time to test it. Failing that JavaScript and write the result to a list, I guess there are a few ways I know outbound requests are a pain though. – Hugh Wood Nov 2 '12 at 17:24
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Could you just check if the current request URL contains "SharePoint.com"?

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You can have custom domains - onlinehelp.microsoft.com/en-gb/office365-enterprises/… – Ryan Jun 12 at 11:21
That is a good point. I guess my method would work for Private Site Collections, but not Public Web Sites. – Mark Stokes Jun 13 at 11:48

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