[2008] Create an array and add items to it

[melaniecarr23]

I would like to create an array named ingredients, and add items to the array based upon certain criteria. Then I want to use the array to populate a listbox with the ingredients.

Something like this:
Dim ingredients as arraylist = new arraylist

ingredients.Add = (oilamt(x) & " " & measure & " " oilname(x))
lstIngredients.items = ingredients()

This section of code is part of a larger part where x is defined and this would be inside a loop to add all items necessary.

I can't figure out whether to use array or arraylist, first of all, and how to make it work. Thanks for any help!

[gep13]

Hey,

What it comes down to is what kind of objects are you going to store in the "array". An ArrayList is a general purpose collection that will let you add any object to it. If you know ahead of time what kind of object you are going to be adding, you might want to use a more specific type of collection, or perhaps a generic collection.

In the code that you have posted, are you getting an error?

Remember to wrap your code in [CODE] tags to make it more readable.

Gary

[Shaggy Hiker]

A much easier solution would be a List (of String) in this case (a generic collection type). You can use arrays, but you have to manually re-size them, which is more tricky than the List. You can add to Lists by just calling List.Add. You can also add into specific places in the list, remove items with RemoveAt, etc. Most likely a better solution than just the array.

You can also add the List directly to the listbox, though offhand, I have forgotten how. Something like AddRange.

[gep13]

Hey,

How about this:

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim list As New List(Of String)
        list.Add("one")
        list.Add("two")
        list.Add("three")

        ListBox1.DataSource = list
    End Sub

Gary

[gep13]

Although,

This would work too

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim list As New List(Of String)
        list.Add("one")
        list.Add("two")
        list.Add("three")

        ListBox1.Items.AddRange(list.ToArray)
    End Sub

Gary

[melaniecarr23]

Thank you so much for your help. I am very grateful for the advice.

I figured out a way to get the information into the listbox directly by assigning the ingredients to a string called ingredient first, then adding the item to the list box.

Dim ingredient as String = ""
ingredient = (oilamt(x) & " " & measure & " " oilname(x))
lstIngredients.Items.Add(ingredient)

[youthbytes]

Thank you so much for your help. I am very grateful for the advice.

I figured out a way to get the information into the listbox directly by assigning the ingredients to a string called ingredient first, then adding the item to the list box.

Dim ingredient as String = ""
ingredient = (oilamt(x) & " " & measure & " " oilname(x))
lstIngredients.Items.Add(ingredient)

You can shorten that to 1 line of code:

lstIngredients.Items.Add((oilamt(x) & " " & measure & " " oilname(x)))