Adding items to a List(Of) during for loop VB

Question

I am trying to add each numeric digit in a textbox to a list(of Integer) but I am required to use integer.Parse to get it into the correct format, but upon doing so receive a "Object reference not set to an instance of an object" error. My code is as follows:

Dim key As List(Of Integer)
Dim digit As Integer

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
    For Each c As Char In TextBox1.Text
        digit = Integer.Parse(c)
        key.Add(digit)
    Next
End Sub

`Dim` only declares that you want a variable named `key` to be a `List(of Int32)`. it does not create the collection object. — Ňɏssa Pøngjǣrdenlarp, Jul 06 '16 at 00:56

score 1 · Accepted Answer · edited Jul 06 '16 at 00:59

1

You must initialize an instance of the list. This is done using the New keyword:

Dim key As New List(Of Integer)

Read more about the New keyword

edited Jul 06 '16 at 00:59

Ňɏssa Pøngjǣrdenlarp

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answered Jul 06 '16 at 00:54

Visual Vincent

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Adding items to a List(Of) during for loop VB

1 Answers1