score:2
Accepted answer
you should return containsexp
directly, passing expression.lambda
as an argument for and
does not make sense. and
can operate on boolean values. it can operate on result of function, if the result is boolean value. but it can not take function itself as an argument.
what you have done is basically
bool res = ((func<mv, bool>)(mv => ftsids.contains(mv.mvid))) && true;
Source: stackoverflow.com
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