array of custom type arrays

Question

I have defined a new class type called Hotspot. I need 2 dynamic array of Hotspot (I used List) and a third one that allow me to "switch" between them. Here my code:

List<Hotspot> items = new List<Hotspot>();
List<Hotspot> locations = new List<Hotspot>();

Hotspot[][] arrays = new Hotspot[][]{items, locations};

but arrays doesn't work. I just need it so I can easily access to items/locations array.

In F# I did it in this way:

let mutable items = new ResizeArray<Hotspot>()
let mutable locations = new ResizeArray<Hotspot>()

let arrays = [|items; locations|]

but I can't do the same thing in C#. Some help?

It doesn't work because a List<Hotspot> is not the same as a Hotspot. In other words, you declare arrays to be a 2d array of Hotspots, yet you try filling it with two Lists. With static typing, that can't happen. — Major Productions
– Major Productions, Commented Jul 8, 2012 at 21:20

Thom Smith · Accepted Answer · 2012-07-08 21:21:01Z

4

List<Hotspot>[] arrays = new List<Hotspot>[]{items, locations};

answered Jul 8, 2012 at 21:21

Thom Smith

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Jeff Mercado · Accepted Answer · 2012-07-08 21:22:00Z

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items and locations are declared (and instantiated) as lists. Lists are not arrays and you're trying to assign them as arrays. Convert them to arrays or don't use arrays at all but a list instead.

Hotspot[][] arrays = new Hotspot[][]{ items.ToArray(), locations.ToArray() };
//or
List<Hotspot>[] lists = new[] { items, locations };

p.s., The F# ResizeArray<T> is essentially an alias to the .NET List<T>. So in effect, the arrays variable in your F# example is equivalent to lists in my example above, you created an array of lists.

answered Jul 8, 2012 at 21:22

Jeff Mercado

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2 Comments

Only Bolivian Here Over a year ago

The latter is much cleaner in my opinion.

Frank Lioty Over a year ago

I don't know why there was problems about the position of "arrays" declaration. Done within Form_Load() and it works. It makes no sense for me...

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