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vb.net - get random from array

Posted on 2013-05-14
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Last Modified: 2013-05-14
Hello,
I am trying to get 3 results when I call showRand() function.
how can I make something so that I dont get the same number twice?

        Dim numbs() As String = {"1", "2", "3", "11", "12", "13"}
        Debug.Print(showRand(numbs, 3))
        
    
    Function showRand(ByRef data() As String, Optional ByVal MoreThanOne As Integer = 0) As String
        Dim Result As String = Nothing
        Dim Rand As New Random

        If MoreThanOne > 0 Then
            For i = 1 To MoreThanOne
                Result += data(Rand.Next(0, data.GetUpperBound(0) + 1)) & ","
            Next
            Result = Result.Substring(0, Result.Length - 1)
        Else
            Result = data(Rand.Next(0, data.GetUpperBound(0) + 1))
        End If

        Return Result
    End Function

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Question by:XK8ER
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Accepted Solution

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Mike Tomlinson earned 500 total points
ID: 39167123
One way...
    Function showRand(ByVal data() As String, Optional ByVal MoreThanOne As Integer = 0) As String
        Dim Result As String = Nothing
        Static Rand As New Random

        If MoreThanOne > 0 Then
            If MoreThanOne <= data.Length Then
                Dim index As Integer
                Dim strings As New List(Of String)(data)
                Dim selected As New List(Of String)
                For i As Integer = 1 To MoreThanOne
                    index = Rand.Next(0, strings.Count)
                    selected.Add(strings(index))
                    strings.RemoveAt(index)
                Next
                Result = String.Join(",", selected.ToArray)
            End If
        Else
            Result = data(Rand.Next(0, data.Length))
        End If

        Return Result
    End Function

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