Input string was not in a correct format

Question

I'm getting an error when I run my program. The line that has an error is this:

int[] line = Array.ConvertAll<string, int> (lines, int.Parse);

not sure how to fix it

Answer 1

Do you want to convert a string, or string array to integer array?

---

Mitja

Answer 2

In any case, you can use Select extension method:

string[] strArr = { "1", "2", "3" };
string str = "1,2,3";
int[] intArr = strArr.Select(s => int.Parse(s)).ToArray(); //convert string[]
int[] intArr2 = str.Split(',').Select(s => int.Parse(s)).ToArray(); //convert string

---

Mitja

Answer 3

Check the content of lines. At list one item is not convertible to an int.

Answer 4

I'm trying to convert a line that contains something like this:

E,1,100

Answer 5

Well, you can't cast the letter "E" to an integer!  If you want to just throw away non-integer strings, you could tweak the anonymous method like so:

string[] strArr = { "1", "2", "3" };
string str = "1,2,3";
int?[] intArr = strArr.Select(s => 
{int val; 
 if (int.TryParse(s, out val) return new int?(val); else return new int?();
 }).ToArray(); //convert string[]

If you don't want ot just throw away the letters, then you'll need to figure out how to handle them.

Answer 6

or:

            string str = "E,1,100";
            int[] intArr = str.Split(',').Select(s =>
            {
                int value;
                bool success = int.TryParse(s.ToString(), out value);
                return new { value, success };
            })
                  .Where(w => w.success)
                  .Select(s => s.value).ToArray();

---

Mitja

Answer 7

I don't want to throw away the letters. What I'm trying to do is read the line of data and if it begins with a certain letter to place the third number into a category:

Ex.

E, 1, 100

H, 1, 100

E, 2, 80

E array is 180

H array is 100

I had if statements after to check if the first value was a certain letter and if so then the third value would then place that into its own array

Answer 8

string[] lines = ...;
lines.Select(line => line.Split(new char[]{',', ' '}, StringSplitOptions.RemoveEmptyEntries))
.GroupBy(line => line[0])
.Select(group => new
{
  letter = group.Key,
  FirstValue = group.Sum(line => int.Parse(line[1])),
  SecondValue = group.Sum(line => int.Parse(line[2])),
});

Answer 9

Please check following link, It may be useful to you.

1. http://social.msdn.microsoft.com/Forums/en-US/netfxbcl/thread/fc6b2e87-3d54-4608-b6bf-4723613333bf
2. Input string was not in a correct format
3. How can I solve : Input string was not in a correct format.....?

Answer 10

I don't want to throw away the letters. What I'm trying to do is read the line of data and if it begins with a certain letter to place the third number into a category:

...

I had if statements after to check if the first value was a certain letter and if so then the third value would then place that into its own array

What a poor descrpition. Can you finally create a full issue explanation? In each of your posts you add  bit of "something-else". 

What means "you add 3rd number into category? What is category here?

Please be punctual!

---

Mitja