Converting String To Float in C#

Question

I am converting a string like "41.00027357629127", and I am using;

Convert.ToSingle("41.00027357629127");

or

float.Parse("41.00027357629127");

These methods return 4.10002732E+15.

When I convert to float I want "41.00027357629127". This string should be the same...

How do you know what it is converted to - that is how are you displaying the number — mmmmmm, Jun 26 '12 at 08:25
41.00027357629127 shall not be 4.10002732E+15 in scientific notation, unless of course your culture uses decimal comma instead of decimal point (and dot as thousands separator), so the number would actually read: 4100027357629127 consequently become displayed as 4.10002732E+15 — ljgww, Oct 05 '18 at 07:45

score 271 · Accepted Answer · answered Jun 26 '12 at 08:01

271

Your thread's locale is set to one in which the decimal mark is "," instead of ".".

Try using this:

float.Parse("41.00027357629127", CultureInfo.InvariantCulture.NumberFormat);

Note, however, that a float cannot hold that many digits of precision. You would have to use double or Decimal to do so.

answered Jun 26 '12 at 08:01

Matthew Watson

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don't forget to add the namespace `using System.Globalization;` to access `CultureInfo` – Mobiletainment Jan 07 '14 at 09:12
Thanks for this tip. Works fine – Sedat Kumcu Nov 23 '20 at 22:50

score 34 · Answer 2 · edited Oct 06 '18 at 13:24

34

You can use the following:

float asd = (float) Convert.ToDouble("41.00027357629127");

edited Oct 06 '18 at 13:24

Cyber Progs

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answered Nov 25 '14 at 15:05

user4292249

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Please provide some context as to why this is the right answer. – Bas Peeters Nov 25 '14 at 15:20

score 28 · Answer 3 · edited Aug 09 '17 at 23:19

28

First, it is just a presentation of the float number you see in the debugger. The real value is approximately exact (as much as it's possible).

Note: Use always CultureInfo information when dealing with floating point numbers versus strings.

float.Parse("41.00027357629127",
      System.Globalization.CultureInfo.InvariantCulture);

This is just an example; choose an appropriate culture for your case.

edited Aug 09 '17 at 23:19

Peter Mortensen

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answered Jun 26 '12 at 07:40

Tigran

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how can ı choose my CultureInfo ? I am in turkey where ı will add TR-TR ? – Mehmet Jun 26 '12 at 07:55
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@Mehmet `new System.Globalization.CultureInfo("tr-TR")` – sshow Jun 26 '12 at 08:04

score 8 · Answer 4 · edited Nov 08 '15 at 21:35

8

Use Convert.ToDouble("41.00027357629127");

Convert.ToDouble documentation

edited Nov 08 '15 at 21:35

Uli Köhler

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answered Jun 26 '12 at 07:39

Ozgur Dogus

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Doesn't this change the datatype from float to double? OP wanted float. – Fran Martinez Oct 24 '17 at 14:50
ust (float) Convert.ToDouble("41.00027357629127"); to convert to float too. – Liam Jan 02 '23 at 13:59

score 4 · Answer 5 · edited May 23 '17 at 12:02

4

The precision of float is 7 digits. If you want to keep the whole lot, you need to use the double type that keeps 15-16 digits. Regarding formatting, look at a post about formatting doubles. And you need to worry about decimal separators in C#.

edited May 23 '17 at 12:02

Community

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answered Jun 26 '12 at 07:39

jpe

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ı tired double.Parse it returns 4100027357629127.0 it is too bad – Mehmet Jun 26 '12 at 07:43
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This sounds like the '.' character is not the decimal separator in your locale? Check out http://stackoverflow.com/questions/3870154/c-sharp-decimal-separator – jpe Jun 26 '12 at 07:48

score 2 · Answer 6 · answered Oct 31 '22 at 09:39

A 2022 way of converting an string that represents a float value:

(float)Convert.ToDecimal(value, CultureInfo.GetCultureInfo("en-US"));

where you also can choose what kind of float are you expecting to convert, because some CultureInfo instances represents decimal values with a , and others with ..

If you need more decimals to obtain more precision, just not use float

Convert.ToDecimal(value, CultureInfo.GetCultureInfo("en-US"));

score 0 · Answer 7 · answered Jun 26 '12 at 07:38

0

You can double.Parse("41.00027357629127");

answered Jun 26 '12 at 07:38

ABH

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I don't think he's asking how to round it. – O. R. Mapper Jun 26 '12 at 07:39

score -1 · Answer 8 · answered Aug 05 '22 at 09:51

-1

First you need to using System.Globalization to dealing convertions from string to float/double/decimal without problem.

Then you can call Parse on float(or double/decimal depending at the accuracy you need), and as argument in Parse you need your string (you can store it in a variable if you want) and CultureInfo.InvariantCulture.NumberFormat

So, as previous users already explained:

float.Parse("41.00027357629127", CultureInfo.InvariantCulture.NumberFormat);

answered Aug 05 '22 at 09:51

Haki

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This does not provide an answer to the question. Once you have sufficient [reputation](https://stackoverflow.com/help/whats-reputation) you will be able to [comment on any post](https://stackoverflow.com/help/privileges/comment); instead, [provide answers that don't require clarification from the asker](https://meta.stackexchange.com/questions/214173/why-do-i-need-50-reputation-to-comment-what-can-i-do-instead). - [From Review](/review/late-answers/32416679) – JerodG Aug 10 '22 at 17:23

score -3 · Answer 9 · answered Jun 26 '12 at 07:41

-3

You can use parsing with double instead of float to get more precision value.

answered Jun 26 '12 at 07:41

Learner

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Converting String To Float in C#

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