Search tuple for value without crash if NULL

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Hello

I have a tuple list which I want to extract the item2 value for if base on a search on item1.

Depending on the work location the results might not always have the same items.

Eg

Work1
Item1 = HairStylistID Item2 = 01235
Item1 NailTechID Item2 = 1452

Work2
Item1 = HairStylistID Item2 = 08975

I want to be able to store these values in variables but even when I set my fields to nullable if it can find a match in the tuple list it crashes.

Any help would be really appreciated
Thanks

What I have tried:

C#

Guid? NailTechID = list.Select(v => v.Item2).FirstOrDefault((t) => t.Item1 == "NailTechID");

Guid? NailTechID = list.Select(v => v.Item2).FirstOrDefault((t) => t.Item1 == "NailTechID") ?? new Guid("");

Posted 3-Jun-20 6:03am

Nicole Strain

Updated 3-Jun-20 6:41am

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F-ES Sitecore 3-Jun-20 12:56pm

In addition to Richard's solution about filtering on Item1 first and then selecting Item2, you are expecting Item2 to be a GUID but in your data you're not using GUIDs as the second item type. If the sample data you have is accurate it would help if you added the type definition of "list"

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Richard Deeming · Accepted Answer · 2020-06-03T06:43:00

Solution 1

You need to filter before you project:

C#

var NailTechID = list.Where(v => v.Item1 == "NailTechID").Select(v => v.Item2).FirstOrDefault();

Posted 3-Jun-20 6:43am

Richard Deeming

Updated 3-Jun-20 6:55am

v2

Comments

F-ES Sitecore 3-Jun-20 12:53pm

Minor nit-pick but

var NailTechID = list.Where(v => v.Item1 == "NailTechID").Select(v => v.Item2).FirstOrDefault();

Richard Deeming 3-Jun-20 12:54pm

D'Oh! That's what I meant. Fixed.

Maciej Los 3-Jun-20 14:32pm

~~Sorry, but not fixed ;(~~
Sorry, my bad ;)
5ed!

George Swan 3-Jun-20 14:27pm

Could I suggest that you use named tuples so that you can avoid referring to Item1,Item2 as that's error prone? Something like this:
List<(int Id, string Name)> tuples = new List<(int, string)> { (1, "A"), (2, "B"), (1, "C") };
var id=tuples.Where(v=> v.Id == 1).Select(v => v.Id).FirstOrDefault();

George Swan 3-Jun-20 14:31pm

Sorry, I should have made it clear that my previous comment was addressed to the op, not Richard

Nicole Strain 3-Jun-20 14:37pm

Thank you all ! :-)