Format exception when I am converting to Int32

Question

While i am trying to convert a value to Int32, I get an error format exception, meaning the value is not in the proper format. I think I am converting a value in right forma

Answer 1

You will get FormatException in cases such next:

Convert.ToInt32("foo");
Convert.ToInt32(5.5);

because

FormatException

value does not consist of an optional sign followed by a sequence of digits (0 through 9).

MSDN

Answer 2

You can always check the type of the value you are passing in to such functions by using the GetType().

The condition where I was stuck in this issue was conversion of a dynamically generated stringyfied decimal value to int. Figured out the type of the value using the GetType() and first converting it into double then int solved the problem.

Answer 3

Perhaps the hint is in "I think I am converting a value in right format though"

Are you sure your number is formatted according to your current culture?

If not, it's Int32.TryParse(String, NumberStyles, IFormatProvider, Int32%) [details here][1] that you should be using

[1]: http://Int32.TryParse Method (String, NumberStyles, IFormatProvider, Int32%)

Answer 4

Try using Int32.TryParse() you can find documentation on MSDN

Answer 5

string str = "123";
int i = 0;
if (int.TryParse(str, out i))
{
    //do your logic here
}

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