C# Converting string to int fails

Question

I am working on a little project, that at a certain point need to convert a string to int.

I tried the following things:

//first try
value1 = int.TryParse(value[0].tostring(), out i)

//second
value1 = Convert.ToInt32(value[0].tostring())

//third
value1 = int.Parse(value[0].tostring())

I even wrote my own conversion method because I was at a loss.

The values I am trying to convert are queried from a MySQL database.

Thank for your help

EDIT:

I know tryparse should have 2 params.

And the error iam getting is a formatexception Input string was not in a correct format.

I got that on all the tries.

the value in my test case is 2500 Keep in mind that that number is received from a db I tried the above snippets while using a hard coded value. And that works fine.

EDIT 2: the values //http://imgur.com/NSyg2rJ

What is the declaration for `value`? What is the contents of `value[0]`? — Matthew Watson, Dec 13 '13 at 14:19
its `ToString`, not `tostring`, also `int.TryParse` takes two arguments. — Habib, Dec 13 '13 at 14:19
int.TryParse(value[0].tostring()) should have two parameters http://www.dotnetperls.com/int-tryparse — unique, Dec 13 '13 at 14:21
Can you give more details on what the value for `value[0].ToString()` is? It might be a string that cannot be converted to a number. — Kami, Dec 13 '13 at 14:25
@user214623 The code appears solid, the value is probably not what you are expecting and/or it has a character that cannot be displayed. Use `Debug.WriteLine` to output the text or use a debugger to see it's exact value at runtime. — Kami, Dec 13 '13 at 15:30

score 0 · Answer 1 · answered Dec 13 '13 at 14:31

0

Try this -

int value1;
if (Int.TryParse(value[0].ToString(), out value1))
{
    //conversion successful
}

answered Dec 13 '13 at 14:31

dynamicuser

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score 0 · Accepted Answer · answered Dec 13 '13 at 14:50

0

One: The signature of int.TryParse() is incorrect:

int result = 0;
bool parsedSuccessfully = Int32.TryParse(value[0].ToString(), out result);
//If successful, result will hold the value.

Two: The signature of Convert.ToInt32() is correct, minus the case of the .ToString() method. This is failing because value or value[0] is null, or it cannot convert something like the string "NotAnInt" to an int.

Three: The signature of int.Parse() is correct, but is failing for the same reasons as two.

answered Dec 13 '13 at 14:50

DJH

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Thanks for your reaction. i typoed the tryparse method. of cousre there should be 2 params. As for the value in values[0] that is 2500, so that shouldn't be a problem. Right? – WillemT Dec 13 '13 at 15:05
If values[0] is 2500 it should work. Does that not work for you? – DJH Dec 13 '13 at 15:12
Nope it doesnt... I know it weird... – WillemT Dec 13 '13 at 15:25
Iam lossing my mind over this – WillemT Dec 13 '13 at 15:25
What is the exact type and value of values[0]? I assume 2500 is the value. Are you sure there are no illegal characters in the input string that could make it fail? Try [specifying the format provider](http://stackoverflow.com/questions/7532801/system-formatexception-input-string-was-not-in-a-correct-format) and see if that still fails. – DJH Dec 13 '13 at 15:33
oh wauw, i just printed the string length... 2500 should have a string length of 4... The string was length 5 – WillemT Dec 13 '13 at 15:51
so how can i see the "missing" char – WillemT Dec 13 '13 at 15:52
Try using something like [this](http://stackoverflow.com/a/11138139/1229237) on your input string. I'm a little out of my depth now, but I believe you can have non-printable characters in your string. This could be preventing the conversion. But it's only a guess. – DJH Dec 13 '13 at 16:05
Stupid me there is an euro sign in the string. it is received from db. which is a latin db so maybe that changes things – WillemT Dec 13 '13 at 16:36
Well there's your problem. However, [you can convert with the currency symbol in the string](http://stackoverflow.com/questions/4094334/format-currency-string-to-integer). – DJH Dec 13 '13 at 16:46
the problem is of course that the symbol is not visible when debugging and i tried the method you gave me. but it still doesnt work – WillemT Dec 13 '13 at 17:27
please check the images included on my post that is what it looks like – WillemT Dec 13 '13 at 17:57
Did you remove the symbol from the string? If you did then I am out of ideas... – DJH Dec 13 '13 at 18:05
Thanks for your help. I fixed it by removing the euro sign in the database – WillemT Dec 19 '13 at 07:30

C# Converting string to int fails

2 Answers2