How to take count of unique sub-string occurrence

Question

I have the following Guids received from client in an array.

Question: How i can take count of the unique Guids showing after '_' from the following array.

0: "5146d57a-701d-e511-82ee-303a64efb676_6544d57a-701d-e511-82ee-303a64efb676"
1: "5546d57a-701d-e511-82ee-303a64efb676_6544d57a-701d-e511-82ee-303a64efb676"
2: "5346d57a-701d-e511-82ee-303a64efb676_6544d57a-701d-e511-82ee-303a64efb676"

3: "5146d57a-701d-e511-82ee-303a64efb676_6644d57a-701d-e511-82ee-303a64efb676"
4: "5546d57a-701d-e511-82ee-303a64efb676_6644d57a-701d-e511-82ee-303a64efb676"
5: "5346d57a-701d-e511-82ee-303a64efb676_6644d57a-701d-e511-82ee-303a64efb676"

6: "5146d57a-701d-e511-82ee-303a64efb676_6744d57a-701d-e511-82ee-303a64efb676"
7: "5546d57a-701d-e511-82ee-303a64efb676_6744d57a-701d-e511-82ee-303a64efb676"
8: "5346d57a-701d-e511-82ee-303a64efb676_6744d57a-701d-e511-82ee-303a64efb676"

post what have you tried and the problem you are facing instead of asking for a readymade solution. — gp.
– gp., Commented Jun 28, 2015 at 10:05
Solution alredy provided : stackoverflow.com/q/1388361/3711660 — Toumash
– Toumash, Commented Jun 28, 2015 at 10:05

Raidri · Accepted Answer · 2015-06-28 10:12:06Z

2

If your input is some implementation of IEnumerable<string> (e.g. array or list):

int count = input.Select(line => line.Split('_').Last()).Distinct().Count();

This splits each line at the _ character, takes only the last part and counts the distinct parts.

edited Jun 28, 2015 at 10:12

answered Jun 28, 2015 at 10:09

Raidri

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3 Comments

TheKingPinMirza Over a year ago

Implementation is public List<Guid> Ids { get; set; }

Raidri Over a year ago

Your answer shows a list of two guids per line, that can't be a List<Guid>.

TheKingPinMirza Over a year ago

you're right. I change implementation from Guid to string and it gives the require result. thanks

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