How to Use substring in c#?

Question

I have -$2.00 as the string. I am trying to change it to decimal by removing - and $ using substring, but I am doing it wrong. Can someone help me?

Thanks.

Answer 1

string m = "-$2.00";
decimal d = Math.Abs(Decimal.Parse(m, NumberStyles.Currency));

Answer 2

Substring will return a new string. I suspect your issue is likely from trying to mutate the string in place, which does not work.

You can do:

string result = original.Substring(2);
decimal value = decimal.Parse(result);

Depending on how the input string is generated, you may want to use decimal.TryParse instead, or some other routine with better error handling.

Answer 3

Don't.

Instead, you should make .Net do the dirty work for you:

Decimal value = Decimal.Parse("-$2.00", NumberStyles.Currency);

If, for some reason, you don't want a negative number, call Math.Abs .

Answer 4

所有字符串操作都返回一个新字符串，因为字符串是不可变的

Answer 5

I wouldn't use substring if you can avoid it. It would be much simpler to do something like:

string result = original.Replace("$", "").Replace("-", "");