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Say I want to unit test Entity Framework's query logic, one way would be to convert the DbSet<T> to IQueryable<T> before building the expression trees for easy mocking. Is this "safe" and is there anything to be aware about?
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AsEnumerable preserves deferred execution and does not build an often useless intermediate list. On the other hand, when forced execution of a LINQ query is desired, ToList can be a way to do that. AsQueryable can be used to make an enumerable collection accept expressions in LINQ statements.
ToListAsync(IQueryable)Creates a List<T> from an IQueryable by enumerating it asynchronously.
It is not only safe, it is legal and fully standard. This is what OO is all about. You just downcast. A DbSet HAS to be a IQUeryable, per the contract defined by the designers.
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