The two lists are like
LISTONE "ONE", "TWO", "THREE"
LISTTWO "ONE", "TWO", "THREE"
i need to compare the whether the items in two lists are in same order or not.
Is there any way to do this in LINQ
asked Jul 23, 2010 at 15:40
Thorin Oakenshield
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2possible duplicate of Examining two string arrays for equivalenceYuriy Faktorovich– Yuriy Faktorovich2010-07-23 15:46:13 +00:00Commented Jul 23, 2010 at 15:46
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The SequenceEqual operator (extension method) seems like what you'd want, unless ListOne is allowed to have items that are not in ListTwo or vice-versa.Dr. Wily's Apprentice– Dr. Wily's Apprentice2010-07-23 15:49:57 +00:00Commented Jul 23, 2010 at 15:49
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possible duplicate of Is there a built-in method to compare collections in C#?nawfal– nawfal2013-11-08 20:27:02 +00:00Commented Nov 8, 2013 at 20:27
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5 Answers
Maybe:
bool equal = collection1.SequenceEqual(collection2);
See also: Comparing two collections for equality irrespective of the order of items in them
3 Comments
Kieren Johnstone
The
OrderBy calls would mean that the order was ignored: but Pramodh wants to see if they are in the same order
Matthew Groves
yeah sorry, don't know why I initially put those in there :)
adrianos
+1 great tip - thanks - you saved me from writing some terrible, terrible code!
Determine if both lists contain the same data in same order:
bool result = list1.SequenceEqual(list2);
Same entries in different order:
bool result = list1.Intersect(list2).Count() == list1.Count;
1 Comment
LukeH
Watch out with the second version. The
Intersect method uses set intersection, so you might get unexpected results if one or both of the lists contain duplicates.If you know there can't be duplicates:
bool result = a.All(item => a.IndexOf(item) == b.IndexOf(item));
Otherwise
bool result = a.SequenceEquals(b)
Comments
List<string> list1;
List<string> list2;
bool sameOrder = list1.SequenceEqual(list2);
answered Jul 23, 2010 at 15:46
Martin Ingvar Kofoed Jensen
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Comments
These are the correct answers, but as a thought, If you know the lists will have the same data but may be in different order, Why not just sort the lists to guarantee the same order.
var newList = LISTONE.OrderBy(x=>x.[sequence]).ToList();
