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c#linqienumerableequality
Berryl
Berryl

Reputation: 12853

Equality between two enumerables

I have two enumerables with the exact same reference elements, and wondering why Equals wouldn't be true.

As a side question, the code below to compare each element works, but there must be a more elegant way

var other = (ActivityService) obj;
if (!AllAccounts.Count().Equals(other.AllAccounts.Count())) return false;
for (int i = 0; i < AllAccounts.Count(); i++) {
    if (!AllAccounts.ElementAt(i).Equals(other.AllAccounts.ElementAt(i))) {
        return false;
    }
}
return true;

Upvotes: 31

Views: 18737

Answers (2)

Ahmad Mageed
Ahmad Mageed

Reputation: 96507

Have a look at the Enumerable.SequenceEqual method.

bool result = AllAccounts.SequenceEqual(other.AllAccounts);

Depending on the data type you may also need to use the overloaded method that accepts an IEqualityComparer to define a custom comparison method.

Upvotes: 57

Anthony Pegram
Anthony Pegram

Reputation: 126932

.Equals is comparing the references of the enumerables, not the elements they contain.

Upvotes: 17

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