C# Decimal.Parse issue with commas

Question

Here's my problem (for en-US):

Decimal.Parse("1,2,3,4") returns 1234, instead of throwing an InvalidFormatException.

Most Windows applications (Excel en-US) do not drop the thousand separators and do not consider that value a decimal number. The same issue happens for other languages (although with different characters).

Are there any other decimal parsing libraries out there that solve this issue?

Thanks!

Answer 1

It's allowing thousands, because the default NumberStyles value used by Decimal.Parse (NumberStyles.Number) includes NumberStyles.AllowThousands.

If you want to disallow the thousands separators, you can just remove that flag, like this:

Decimal.Parse("1,2,3,4", NumberStyles.Number ^ NumberStyles.AllowThousands) 

(the above code will throw an InvalidFormatException, which is what you want, right?)