尝试一下:

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

变量i应该具有名为"Michael"的人的位置.

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

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".