Parse string to decimal, commas and periods

Question

How to parse string to decimal so it would work for both formats - w/ commas and periods?

[Fact]
public void foo(){
  var a="1,1";
  var b="1.1";
  Assert.Equal(Parse(a),Parse(b));
}
private decimal Parse(string s){
  return decimal.Parse(s,NumberStyles.Any,
    CultureInfo.InvariantCulture);
}

output:

Test 'Unit.Sandbox.foo' failed: Assert.Equal() Failure
Expected: 11
Actual:   1,1

Answer 1

You could try that:

private decimal Parse(string s){
  s = s.Replace(",", CultureInfo.InvariantCulture.NumberFormat.NumberDecimalSeparator);
  return decimal.Parse(s,NumberStyles.Any,
    CultureInfo.InvariantCulture);
}

Answer 2

How about this?

private static decimal Parse(string s)
    {
        s = s.Replace(",", ".");
        return decimal.Parse(s);
    }

Answer 3

You should get the desired result by modifying the Currency decimal separator to a comma before a parse on a comma decimal string. There are some food resources here:

http://msdn.microsoft.com/en-us/library/system.globalization.numberformatinfo.currencydecimalseparator.aspx#Y888

You could alternatively implement your own Iformatprovider as discussed here:

http://msdn.microsoft.com/en-us/library/t7xswkc6.aspx http://msdn.microsoft.com/en-us/library/system.globalization.numberformatinfo.aspx

Oh, or you could do a dirty hack and simply run a string replace on "," with ".";)

Answer 4

If you have an English-language operating system, this method converts a decimal number with a comma to a dot. If you have Russian, the method converts a decimal number with a dot to a comma.

Console.Write("Input number: ");
string? input = Console.ReadLine();
decimal number = ConvertNumberToCurrentLocale(input);
Console.WriteLine("Result: " + number);

decimal ConvertNumberToCurrentLocale(string? input)
{
    string separator = Thread.CurrentThread.CurrentCulture.NumberFormat.NumberDecimalSeparator;
    switch (separator)
    {
        case ".":
            input = input?.Replace(",", ".");
            break;
        case ",":
            input = input?.Replace(".", ",");
            break;
    }
    decimal.TryParse(input, out var number);
    return number;
}