In Powershell how can I convert a string with a trailing 'sign' to a number?

Question

I need to convert strings with optional trailing signs into actual numbers using Powershell.

Possible strings are:

• 1000-
• 323+
• 456

I'm trying to use System.Int.TryParse with a NumberStyles of AllowTrailingSign, but I can't work out how to make System.Globalization.NumberStyles available to Powershell.

Answer 1

If you are sure that the signs could be - or +, String.Replace could help.

If you mean that 323- should return -323, checking for the sign and multiplying it by -1 would help.

Answer 2

[System.Globalization.NumberStyles]::AllowTrailingSign

I should also point out, that when I'm dealing with enums in general, sometimes I can get by typing a string. E.g. in this case, just put

"AllowTrailingSign"

Final note, when quizzing an Enum for all possible values, use the line:

[System.Globalization.NumberStyles] | gm -static

Answer 3

EDIT: as per Halr9000's suggestion

$foo = "300-";
$bar = 0;
$numberStyles = [System.Globalization.NumberStyles];
$cultureInfo = [System.Globalization.CultureInfo];

[int]::TryParse($foo, $numberStyles::AllowTrailingSign, $cultureInfo::CurrentCulture, [ref]$bar);

Answer 4

Here's a better way to get the enum values:

$type = [System.Globalization.NumberStyles]
[enum]::GetValues($type)