Find item in array of structure

Question

I have a question. Imagine that in vb.net, fill a array of structure with a lot of items. For example, here I declare the structure called Persons:

    Public structure Persons
         Dim name as string
         Dim age as integer
    End structure

Then, I declare a variable that is a array of persons, for make a list of friends, like this:

    Dim friends() as Persons
    friends(0).name = "Sebastian"
    friends(0).age = 19

    friends(1).name = "Michael"
    friends(1).age = 34

    ...

So, there are any form to locate where is the position of "Sebastian"?? In other words. If I would know if "Sebastian" exist in any friends(i).name, and, if exist, returns me the position (i), how I can do this??

Thanks

Why array and not List(Of Persons)? Is this homework? Btw, you should to name the struct Person (singular) , not Persons (plural). — Bjørn-Roger Kringsjå
– Bjørn-Roger Kringsjå, Commented Mar 11, 2015 at 22:06
Hi Bjorn. Homework? You must be kidding. The answer why not List(of Persons) is because I think that is more clean be this like a structure, not how a list. Maybe I'm wrong, I don't know... — Ferran Muñoz
– Ferran Muñoz, Commented Mar 12, 2015 at 9:27

Diego Bauleo · Accepted Answer · 2015-03-11 22:10:37Z

4

Try this:

Dim i As Integer = Array.FindIndex(friends, Function(f) f.name = "Michael")

The variable i should have the position of the person named "Michael".

answered Mar 11, 2015 at 22:10

Diego Bauleo

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3 Comments

Crowcoder Over a year ago

just keep in mind this will return the index of the first "Michael". This is probably exactly what you want but consider what if there are multiple "Michael"s.

Ferran Muñoz Over a year ago

I will try this. Well, the information of the question is a example. In the project will don't exist repeated names :)

Ferran Muñoz Over a year ago

Hey @Diego! The solution works perfectly, it returns me the position of the item that I want. Thank you very much :)

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