Compare if elements in string array exists in another list c#

Question

I have an string array and a list of string. For example,

string[] stringArray = {"car", "bike", "truck"};
List<string> stringList = new List<string>{"car_blue", "car_red", "truck_yellow", "ship_black", "rocket_orange"};

From the array and list, I want to compare stringArray with stringList and retrieve items that are in the stringArray and is also part of the stringList. Eg: the items retrieved should be, 'car_blue', 'car_red' and 'truck_yellow'?

i've tried "stringList.Intersect(stringArray);", but it found no matches. — Little Flying Turtle
– Little Flying Turtle, Commented Apr 23, 2018 at 9:28
is it necessory that strings in list will always have '_', and first part of string should be matched with strings in array ? — Amit
– Amit, Commented Apr 23, 2018 at 9:38
@LittleFlyingTurtle if ' _ ' will not be there in your strings of List, you should edit your question with this clarification. and also comment on the answer regarding the same.. I guess answer of Lucifer will help you in all cases (with and without " _ ") — Amit
– Amit, Commented Apr 23, 2018 at 10:00

adjan · Accepted Answer · 2018-04-23 09:25:02Z

3

You could use LINQ' Where to filter the stringList using the parts before the _:

var result = stringList.Where(x => stringArray.Contains(x.Split('_')[0]));

answered Apr 23, 2018 at 9:25

adjan

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2 Comments

styx Over a year ago

i would add .ToList(); to better evelute the result

Pedro Perez Over a year ago

x.Split('_')[1] is also important.

Tim Schmelter · Accepted Answer · 2018-04-23 09:26:12Z

3

You have to Split by _ to get all tokens, then you can use Intersect...Any:

var itemsInBoth = stringList.Where(s => stringArray.Intersect(s.Split('_')).Any());

If you want to ignore the case, so also accept Car_Yellow:

var itemsInBoth = stringList.Where(s => stringArray.Intersect(s.Split('_'), StringComparer.OrdinalIgnoreCase).Any());

answered Apr 23, 2018 at 9:26

Tim Schmelter

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Comments

Lucifer · Accepted Answer · 2018-04-24 03:44:28Z

2

The Best way where you don't have to use split is

string[] oneMinEnabledTime = stringList.Where(x => stringArray.Any(ele => x.ToLower().Contains(ele.ToLower()))).ToArray();

or if you want list

List<string> oneMinEnabledTime = stringList.Where(x => stringArray.Any(ele => x.ToLower().Contains(ele.ToLower()))).ToList();

edited Apr 24, 2018 at 3:44

answered Apr 23, 2018 at 9:34

Lucifer

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2 Comments

Little Flying Turtle Over a year ago

i've tried your way but I still not able to retrieve the list of items i wanted. However, the items inside my list look something like this: 'land\\car_blue', 'sea\\ship_black'... I cant figure out what is wrong with the method.

Lucifer Over a year ago

what is the issue you are facing?

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