There's a subtle distinction between SPSite.AllWebs and SPWeb.Webs to be aware of—and yes, despite this being the SharePoint API we're talking about, it's more than just a naming oddity!
SPSite.AllWebs returns the immediate child webs of the site collection and all of their child webs (in other words, all webs recursively within the site collection); SPWeb.Webs has a much narrower scope and only returns the first level child webs immediately below the SPWeb object.
So what does this mean and how does it benefit you? If you're writing code that recursively walks the site hierarchy using SPWeb.Webs, you may be able to avoid the overhead by simply using SPSite.AllWebs. Recursion is fun and all but it adds complexity where it may not be warranted.
SPSite.AllWebs returns the immediate child webs of the site collection and all of their child webs (in other words, all webs recursively within the site collection); SPWeb.Webs has a much narrower scope and only returns the first level child webs immediately below the SPWeb object.
So what does this mean and how does it benefit you? If you're writing code that recursively walks the site hierarchy using SPWeb.Webs, you may be able to avoid the overhead by simply using SPSite.AllWebs. Recursion is fun and all but it adds complexity where it may not be warranted.
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