comparing string to array VB

Question

Hey so i have a textbox and i want to compare what the user types in the textbox to the words that are in the array which is from a text file. So i've got the users text as Dim answer as string and im trying to see if answer is in the list of words in the array that are loaded. This is what i have at the moment and i was wanting to just use arrayname.contains but i get the error "'contains' is not a member of form1.words". plz help. Words is the array name btw.

Dim answer As String
If Words.contains(answer) Then
        MessageBox.Show("you got it")
        End If

Can you show how you have declared and initialized the Words variable? — Steve
– Steve, Commented May 16, 2018 at 15:00
So you discovered that .Net arrays do not expose a Contains method, but did you consider looking to see it they expose other methods that may help you achieve the goal? — TnTinMn
– TnTinMn, Commented May 16, 2018 at 15:06
Possibly also show how you assigned the user input to the answer string. — Jimi
– Jimi, Commented May 16, 2018 at 15:18
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– Visual Vincent, Commented May 16, 2018 at 15:39
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– Visual Vincent, Commented May 16, 2018 at 15:42

user1932634 · Accepted Answer · 2018-05-16 15:53:38Z

I'll list two different approaches

ContainsWord1() uses:
Enumerable.Any(Of TSource) - .NET 3.5+
Ref: https://msdn.microsoft.com/en-us/library/yw84x8be(v=vs.110).aspx

ContainsWord2() uses:
Array.Exists(Of T) Method (T(), Predicate(Of T)) - .NET 2.0+
Ref: https://msdn.microsoft.com/en-us/library/bb337697(v=vs.110).aspx

Both are case insensitive.

   Private Function ContainsWord1(p_wordsArray as string(), p_word As string) as Boolean
        return p_wordsArray.Any(Function(s as String) s.Equals(p_word.trim, StringComparison.CurrentCultureIgnoreCase))
    End Function

    Private Function ContainsWord2(p_wordsArray as string(), p_word As string) as Boolean
        return Array.Exists(p_wordsArray, Function(s As String) s.Equals(p_word.trim,  StringComparison.CurrentCultureIgnoreCase))
    End Function

    private Sub ContainsWordExample()
        Dim _words = New String(){"blue","red","yellow", "black"}
        Dim _yellow as string = "YeLloW"
        Dim _green as string = "green"

        'Yellow test
        If ContainsWord1(_words, _yellow) then 
            messagebox.Show("You got it!")
        Else
            messagebox.Show("Try again!")
        End If

        If ContainsWord2(_words, _yellow) then 
            messagebox.Show("You got it!")
        Else
            messagebox.Show("Try again!")
        End If

        'Green test
        If ContainsWord1(_words, _green) then 
            messagebox.Show("You got it!")
        Else
            messagebox.Show("Try again!")
        End If

        If ContainsWord2(_words, _green) then 
            messagebox.Show("You got it!")
        Else
            messagebox.Show("Try again!")
        End If

    End Sub

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