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I do more and more exercise with Lambda but I do not figure out why sometime example use .AsQueryable(); that use the IQueryable and sometime it omit the .AsQueryable(); and use the IEnumerable.
I have read the MSDN but I do no see how ‘executing an expression tree’ is an advantage over not.
Anyone can explain it to me?
IQueryable implements IEnumerable, so right off the bat, with IQueryable, you can do everything that you can do with IEnumerable. IQueryables deal with converting some lambda expression into query on the underlying data source – this could be a SQL database, or an object set.
Basically, you should usually not have to care one way or the other if it is an IQueryable, or an IEnumerable.