Question

i have this code :

IEnumerable<string> q = customers /*EF entity*/
.Select (c => c.Name.ToUpper())
.OrderBy (n => n)

To select entity, ObjectContext actually create ObjectQuery, which
implement IQueryable. The object return from ObjectQuery, is not
normal object, but EntityObject

but what if i write : ( notice the var)

var q = customers /*EF entity*/
.Select (c => c.Name.ToUpper())
.OrderBy (n => n)

it can be determined both to ienumerable or iqueryable :

because ObjectQuery Also implements IEnumerable…

i dont know if there’s any specific info which tell the compiler “use A and not B. A is more specific…” ( there must be…i just cant find it)

any help ? how will it know to use A || B ?

Answer 1

IQueryable<T> itself inherits from IEnumerable<T>, so it’s more specific than IEnumerable<T>, even though ObjectQuery<T> implements both generic interfaces.