c# - How to guarantee two conditions in a return type -


i have method return type inherits specific type , implements specific interface.

that following method treturn? getdata(); can return object following 2 classes, such can handle returned object either tbase object or iexpected one.

class1 : tbase, iexpected class2 : tbase, iexpected

nb : possible solution have common class nothing :

class12base : tbase, iexpected class1 : class12base  class2 : class12base   class12base  getdata();

..but can't modify class 1 nor 2.

you can't, i'm afraid. can document , careful in implementation, , pick one of relevant types act return type, that's there :(

(i'm assuming don't want make method generic in return type , constrain type parameter... put burden onto caller specify type...)


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