Sting to Int from Array

Hi i'm stuck on something so easy, i've googled, tired various methods but cant get it to work. Imagine if you can, i have an array (set as a string type) but the second slot holds a numebr that i want, e.g. 2333.

So to grab it i use the following code, however as my sport array is set to a string it wont allow it. Like i said i have tried a few ways but nothing works. Such a stupid and simple situation. I'm much much better with actionscript :) surely its just a string to int conversion?

Code:

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Dim myNumber As Integer = sport(1)

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Dim myNumber As Integer = CInt(sport(1))

Code:

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Dim myNumber As Integer = Convert.ToInt32(sport(1))

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With both methods i get the following error

"Conversion from string "" to type 'Integer' is not valid."

Perhaps you should use a list(of integer) instead. It'll help avoid issues with blank items.

You will have to make sure that string actually is an integer. It cant be blank, you can use a different object to store the data to resolve this or,

2 Solutions,

1) when loading the array if the string is blank load a 0
2) Do somthing like this, (My VB is rusty)

Code:

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If(sport(1).Trim() != "") then
    myNumber = Convert.ToInt32(sport(1))
else
    myNumber = 0
End If

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oh does that mean my array has a blank item in it?

Yes, a string of "" is equivilant to String,Empty.

Use:

Code:

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Dim myNumber As Integer
Integer.TryParse(sport(1), myNumber)

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Code:

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If(sport(i).Trim() != "") then
            number = Convert.ToInt32(sport(1))
        Else
            number = 0
        End If

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Is there any reason why the "=" is showing an error? It says identifier expected. Thanks for your help chaps.

VB Express 2008

!= should be <>

but use Integer.TryParse

Quote:

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Originally Posted by ForumAccount

!= should be <>

but use Integer.TryParse

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Yep, correct told you my VB was rusty :-S

Hehe all is good now :)

Integer.TryParse is the solution you should go for only if you can not be certain that a certain string contains a valid integer representation, possible scenarios where that applies is if you let the user insert a number by using a textbox.

If you however have the possibility to make sure that the string will always represent an integer, do not use Integer.TryParse but rather Cint(), Integer.Parse or the likes.

Quote:

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Originally Posted by Atheist

Integer.TryParse is the solution you should go for only if you can not be certain that a certain string contains a valid integer representation, possible scenarios where that applies is if you let the user insert a number by using a textbox.

If you however have the possibility to make sure that the string will always represent an integer, do not use Integer.TryParse but rather Cint(), Integer.Parse or the likes.

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Not sure if that was to me, but while what you said is valid I suggested Integer.TryParse because he posted this:

Quote:

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Originally Posted by albo

With both methods i get the following error

"Conversion from string "" to type 'Integer' is not valid."

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So I didn't think he would have consistent Integers passing through.

It wasnt aimed at anyone in particular but I felt like it was a relevant addition to the topic ;)

Indeed it seems like there are empty strings in the array, so what albo should do at first is to find out why this occurs, since it was mentioned in the first post that the second index should contain a number.

Another method is using a converter as shown below

Code:

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Sub StringToInt()
    Dim MyStringArray() As String = _
        {"100", "", "200", "23", Nothing}

    Dim MyIntegerArray() As Integer = _
        Array.ConvertAll(MyStringArray, _
        New Converter(Of String, Integer)(AddressOf _ToInteger))

    For Each Item In MyIntegerArray
        Console.WriteLine(Item)
    Next
End Sub
Private Function _ToInteger(ByVal value As String) As Integer
    Dim Result As Integer = 0
    If Not Integer.TryParse(value, Result) Then
        Result = 0
    End If

    Return Result
End Function

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