score:3
TempProjectionItem is the element type of the sequence... just like an IEnumerable<int> (such as a List<int>) is a sequence of int values without int itself implementing IEnumerable.
Note that there are two sequence interfaces: System.Collections.IEnumerable and System.Collections.Generic.IEnumerable<T>. Obviously the latter is generic, representing a sequence of a particular type. So temp is a sequence of TempProjectionItem elements, and query is a sequence of string elements.
Neither of these is really a collection as such - the queries are executed lazily - it's only evaluated (starting with names) when you iterate over the data. Iterating over query involves iterating over temp which then iterates over names.
score:0
IEnumerable is an interface, isn't it?
Yes, it is. Actually in your code you are using IEnumerable<T> which is a generic interface.
What kind of object is temp and query?
In your code we can see temp is type of IEnumerable<TempProjectionItem>, while query is an IEnumerable<string>, both of which come from IEnumerable<T>.
Why does TempProjectionItem not need to implement IEnumerable?
TempProjectionItem is not IEnumerable, it's just an item of the IEnumerable<TempProjectionItem> which is a "container".
Source: stackoverflow.com
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