Input string was not in a correct format. When i try to convert char->string->int

Question

I have the following code inside my asp.net vmc web application :-

var getNumbers = (from t in ut.newTag
                                where char.IsDigit(t)
                                select t).ToString();
            tech.PartialTag = Convert.ToInt32(getNumbers);

but i am getting the following exception :-

Input string was not in a correct format.

so can anyone advice how i can solve this issue??

Two steps: First, what is ut? Next, what does getNumbers get set to? — n8wrl
– n8wrl, Commented Dec 19, 2013 at 17:06

Sergey Berezovskiy · Accepted Answer · 2013-12-19 17:14:12Z

5

getNumbers is a string, containing type name of string enumerator It will look like

"System.Linq.Enumerable+WhereSelectArrayIterator`1[System.String,System.String]"

You obviously can't convert that type name to integer. If you want to try parse newTag and assign it to PartialTag if there is an integer:

int value;
if (Int32.TryParse(ut.newTag, out value))
    tech.PartialTag = value;

edited Dec 19, 2013 at 17:14

answered Dec 19, 2013 at 17:06

Sergey Berezovskiy

237k44 gold badges441 silver badges468 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Alexei Levenkov Over a year ago

+1: Unless OP wants to ignore non-digits altogether TryParse is much more readable alternative to strange LINQ expression (even Regular expression would be more readable and expected in validation code).

Sergey Berezovskiy Over a year ago

@AlexeiLevenkov thanks :) Just want to add, that regex solution you mentioned will look like string getNumbers = Regex.Replace(ut.newTag, @"\D", ""));

Silvermind Over a year ago

Are you not lazy anymore? ;) Or still lazy but covertly.

Sergey Berezovskiy Over a year ago

@Silvermind ah, that would take so many efforts to explain.. :)

Raphaël Althaus · Accepted Answer · 2013-12-19 17:13:17Z

3

There's a ctor of String taking a char[] as parameter, so

var getNumbers = new String((from t in ut.newTag
                                where char.IsDigit(t)
                                select t).ToArray());
tech.PartialTag = Convert.ToInt32(getNumbers);

Difference with Sergey's answer :

if your input is 1A2 for example, Sergey's solution won't accept the input.

But my solution (based on yours) will take 12.

So, it depends on what you need (I think Sergey's one is clearer, it just rejects non integers inputs).

edited Dec 19, 2013 at 17:13

answered Dec 19, 2013 at 17:08

Raphaël Althaus

60.6k6 gold badges106 silver badges127 bronze badges

2 Comments

Sergey Berezovskiy Over a year ago

You can simplify string creation a little with new String(ut.newTag.Where(Char.IsDigit).ToArray()) :)

Raphaël Althaus Over a year ago

Yup, I know the fluent syntax, was just trying to be as closed as OP's try ;)

Collectives™ on Stack Overflow

Input string was not in a correct format. When i try to convert char->string->int

2 Answers 2

4 Comments

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

4 Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related