Input string was not in correct format error when parsing to int

Question

I get error "Input string was not in correct format" when parsing to int. But string is in correct format. I'm adding screenshot below.

Is something really wrong here or did my vacation time come ? — Doruk
– Doruk, Commented May 16, 2017 at 11:09
Looks fine. There might be some unprintable characters in the string which cause problems. Can you try to create a minimal reproducible example? — Heinzi
– Heinzi, Commented May 16, 2017 at 11:09
As @Heinzi said, there must be some hidden characters in your string. Try int.Parse(a.Substring 0,4) — Pikoh
– Pikoh, Commented May 16, 2017 at 11:10
@Doruk yes, but as Heinzi explained that would fail if you get a string without that leading character. It's better to clean the string as you now are doing. Glad it works — Pikoh
– Pikoh, Commented May 16, 2017 at 11:27

Pikoh · Accepted Answer · 2017-05-16 11:15:29Z

1

The problem is that there must be some hidden characters in your a string variable (Carriage Return maybe?). Try int.Parse(a.Substring 0,4) as usually they are at the end of the string.

You could also clean the input where you are getting that value from.

answered May 16, 2017 at 11:15

Pikoh

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Morten Bork · Accepted Answer · 2017-05-16 11:15:03Z

1

I noticed you are doing multiple conversions. Are you sure it's a ("2016") that is causing the error? if yes, then there must be hidden characters as other have suggested. The a.substring(0,4) would indeed remove any trailing characters. But if the first character is a hidden char, it would not.

string output = new string(input.Where(c => char.IsLetter(c) || char.IsDigit(c)).ToArray());

should clear out any possible hidden characters.

edited May 16, 2017 at 11:15

answered May 16, 2017 at 11:12

Morten Bork

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2 Comments

Doruk Over a year ago

yeah. i'm sure.

Morten Bork Over a year ago

did you try to clean up a with the line I suggested?

Jens Bornschein · Accepted Answer · 2017-05-16 11:17:34Z

1

Maybe you can try something like this:

int x = Convert.ToInt32(a);

Furthermore you can try to use the .ToString() Methode of a to make it run more stable.

You can additionaly try to clear the string from all "non number" chars using Rexex:

/// <summary>
/// RegEx to extract all non numeric values.
/// </summary>
private static readonly Regex rxNonDigits = new Regex(@"[^\d.,-]+");

Use it as follows to clear:

String a2 = rxNonDigits.Replace(a, "");

edited May 16, 2017 at 11:17

answered May 16, 2017 at 11:12

Jens Bornschein

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2 Comments

Pikoh Over a year ago

What difference do you expect between int.Parse and Convert.ToIn32?

Jens Bornschein Over a year ago

I've added another idea for a “String” clearing method underneath.

Sandip Bantawa · Accepted Answer · 2017-05-16 11:18:55Z

1

I think you are using REST API with JSON or passing whole string in query string i.e JSON formatted string, then you should use

a = new JavaScriptSerializer().Deserialize(a, null).ToString();
x = int.Parse(a);

answered May 16, 2017 at 11:18

Sandip Bantawa

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