Convert string array to double array in VB.NET

Question

I have a string "TextLine" that contains doubles and integers. Now I want to split the string into its parts and convert the resulting string array to double. Unfortunately I get an overload resolution error (for "parse") when I try to do that. What am I doing wrong?

Dim doubleAry As Double() = Array.ConvertAll(TextLine.Split(vbTab), [Double].Parse)

Steven Doggart · Accepted Answer · 2012-12-27 12:38:58Z

3

You can do it like this:

Dim doubleAry As Double() = Array.ConvertAll(TextLine.Split(vbTab), New Converter(Of String, Double)(AddressOf Double.Parse))

However, if the string array that you are giving it contains any invalid items, that will throw an exception and fail to convert any of the items. If you want to handle invalid items and just default them to 0, you could implement your own converter, like this:

Private Function DoubleConverter(ByVal text As String) As Double
    Dim value As Double = 0
    Double.TryParse(text, value)
    Return value
End Function

Then, you can use it like this:

Dim doubleAry As Double() = Array.ConvertAll(TextLine.Split(vbTab), New Converter(Of String, Double)(AddressOf DoubleConverter))

edited Dec 27, 2012 at 12:38

answered Dec 27, 2012 at 12:24

Steven Doggart

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2 Comments

bluebox Over a year ago

Thanks Steven..But when I run this line I get an FormatException error saying that the input string doesn't have the correct format. Any idea?

Steven Doggart Over a year ago

Then it probably doesn't :) If you want to handle format exceptions on each item individually, you would have to implement your own converter method. I'll update my answer with an example of that.

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