String to byte (not array)... Quite simple (I think)

Hello,
I have a string:
MyString="1234".
I want to convert it to an integer or long.
MyLong=1234

Thx
Xmas

VB Code:

Dim str As String = "1234"
Dim inter As Integer
inter = CType(str, Integer)

Very, very simple :(

Everything you wanted to know about type conversion functions:

ms-help://MS.VSCC/MS.MSDNVS/vblr7/html/vaGrpTypeConversion.htm

ms-help://MS.VSCC/MS.MSDNVS/vblr7/html/vafctctype.htm

No!

Not that simple!
Try this:

VB Code:

Dim str As String = "1234"
Dim inter As Integer
inter = Val(str)

The previous code generates error if your string contains anything besides nummbers. For example if str="1234DF"

Right Lunatic3 . The code I posted was based on his string value .

I thought val was no more to be used in VB.NET. What about

VB Code:

dim i as Integer
  dim s as string
  s = "1234"
 
  i = Integer.Parse(s)

Quote:

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I thought val was no more to be used in VB.NET. What about

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You could have easily tested what you said. 'Val' is still present in .NET and i dont know if it is for backward compatibility or not, however Integer.Parse still produces error if the string contains anything beside numbers.

here's how to sort the integers out from the text in the string

Code:

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  Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim str As String = "1234abc567xyz"
        Dim excluded As String
        Dim i As Integer
        Dim l As Integer

        For i = 0 To str.Length - 1
            If IsNumeric(str.Chars(i)) Then
                l = l & str.Chars(i)
            Else
                excluded = excluded & str.Chars(i)
            End If

        Next

        MessageBox.Show("numbers:" & l & Chr(10) & "letters:" & excluded)

    End Sub

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Lunatic3

I didn't mean tp upset you. I was just wondering about the usage of Val() as it kind of doesn;t fit in with the new methods in .NET where most of the conversion methods are on objects Object.Method(). I would think its for backward compatibility only and Integer.Parse("2223") should be used instead. You can still put this in a Try block to catch erros.

Val() is math function . Parse() is string manipulation function .

Quote:

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I didn't mean tp upset you.

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I didnt get upset at all mate :)

As you said 'val' does not fit into .NET way of thinking and it actually belongs to Microsoft.VisualBasic namespace. Still i found it easier and safer than trying to catch the error. Imagine you catch the error, then what you want to do with it? Are you going to apply a method to retrive the number out of that string? if so then you may use Val ;) .

Quote:

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Originally posted by Pirate
Val() is math function . Parse() is string manipulation function .

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val() is a math function LOCATED in the visualbasic namespace..so it needs vb backwards dll's

Quote:

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Originally posted by PT Exorcist
val() is a math function LOCATED in the visualbasic namespace..so it needs vb backwards dll's

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Still supported in VB.NET 2003 and I bet it will be for some ahead time .:D