We just coded something like (please disregard the variable names, I'm just illustrating the point)
return myCollections.Services ?? (myCollections.Services = dbLayer.GetServices());
one-liner to do a bunch of stuff, and it's still clear what you are trying to do, if you know the ?? operator you can stop right here, if you don't let me explain a bit more
the ?? operator returns the left-hand operator if it is NOT NULL, else it returns the right operand
so this code is the equivalent of:
if (myCollections.Services == null)
myCollections.Services = dbLayer.GetServices();
return myCollections.Services;
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