trying to int.parse multi array string

Question

Im doing this:

string[,] string1 = {{"one", "0"},{"Two", "5"},{"Three","1"}};
int b = 0;

for(int i = 0; i <= string1.Length; i++)
{
     b = int.Parse(string1[i, 1]); // Error occurs here
}

Im getting an error saying that "index extent the limits of the array" (or something like that, the error is in danish).

Answer 1

There are two problems:

• string1.Length will return 6, as that's the total length of the array
• You're using <= for the comparison, so it would actually try to iterate 7 times.

Your for loop should be:

for (int i = 0; i < string1.GetLength(0); i++)

The call to GetLength(0) here will return 3, as the size of the "first" dimension. A call to GetLength(1) return 2, as the second dimension is of size 2. (You don't need that though, as you're basically hard-coding the knowledge that you want the second "column" of each "row".)

See the docs for Array.GetLength() for more details.

Answer 2

Your array bounds are incorrect in the loop:

for(int i = 0; i <= string1.Length; i++) 

should read:

for(int i = 0; i < string1.GetLength(0); i++) 

Two things were wrong: <= versus < meant you were going one item too far, and .Length returns the total length of the array (6) versus GetLength(0) which returns the length of the first dimension (3).

Answer 3

You already have the right answer, I'll update mine just to correct it. To right iteration should be

        for (int i = 0; i < string1.GetLength(0); i++)
        {
            b = int.Parse(string1[i, 1]);
        }

Because i stands for the length of the first dimension, and the fixed 1 will return the number, that is the second element.

I'm sorry for the wrong answer I gave first.

Answer 4

change to

for(int i = 0; i <= string1.GetLength(0); i++) 
{ 
b = Int32.Parse(string1[i][0]);
}

Your code is refering at index 1 rather than 0 which causes exception known as Array out of bound

Answer 5

将i <= string1.Length更改为i < string1.Length 。

Answer 6

Try this:

for(int i = 0; i < string1.GetLength(0) ; i++)
{
     b = int.parse(string1[i, 0]); // Error occurs here
}

Array.GetLength Method

Gets a 32-bit integer that represents the number of elements in the specified dimension of the Array.

Answer 7

另外值得一提的是int.Parse可能抛出一个FormatException ，考虑int.TryParse 。