如何从数组中随机选择一个字符串

Question

I am very new to coding so please forgive me.

I have saved some example strings in an array:

Dim intArray(0 To 2) As String
    intArray(0) = "I will be on time for class"
    intArray(1) = "I will be prepared for class"
    intArray(2) = "I will listen to the teacher and follow instructions"

    lblTestSWPB.Text = intArray(0)

I know that it works when I click the button to generate for (0) - obviously.Is there a way to add something to make the label display a string at random from the array?

Answer 1

You may use something like: Random class

Dim rnd As New Random 'Make sure that you declare it as New, 
'otherwise, it thorws an Exception(NullReferenceException)
Dim intArray(0 To 2) As String

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    intArray(0) = "I will be on time for class"
    intArray(1) = "I will be prepared for class"
    intArray(2) = "I will listen to the teacher and follow instructions"
End Sub

Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
    lblTestSWPB.Text = intArray(rnd.Next(0, 3))
End Sub

Note that rnd.Next is a Function that returns a random Integer from the minimum is the inclusive lower bound and the maximum is the exclusive upper bound.(Thanks to @Enigmativity for the correction.) Click this link if this answer is still unclear for you