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how to convert from string to integer in c# ?
Posted 13-Feb-13 12:31pm
desho215
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Solution 4

Very interesting thing in conversion is Input string, here some examples to understand convertion..
 
1.
int numVal = Int32.Parse("-105");
Console.WriteLine(numVal);
// Output: -105
2.
int j;
bool result = Int32.TryParse("-105", out j);
if (true == result)
    Console.WriteLine(j);
else
    Console.WriteLine("String could not be parsed.");
// Output: -105
3.
try
{
    int m = Int32.Parse("abc");
}
catch (FormatException e)
{
    Console.WriteLine(e.Message);
}
// Output: Input string was not in a correct format.
4.
string inputString = "abc";
int numValue;
bool parsed = Int32.TryParse(inputString, out numValue);
 
if (!parsed)
    Console.WriteLine("Int32.TryParse could not parse '{0}' to an int.\n", inputString);
// Output: Int32.TryParse could not parse 'abc' to an int.
 
From above example you come to know that input string should be in correct format..
 
You can refer below link..
http://msdn.microsoft.com/en-us/library/bb397679.aspx[^]
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Solution 2

use Int32.TryParse[^] or Inst32.Parse[^]
int number;
bool result = Int32.TryParse("string value to convert", out number);
//or
number = Int32.Parse("string value to convert");
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v2
Comments
Sergey Alexandrovich Kryukov at 13-Feb-13 18:13pm
   
5ed. Parse (which is also worth mentioning) and TryParse is much better than convert because it tells us what really happens. "Convert" is a really bad word literally haunting this forum.
—SA
Jibesh at 13-Feb-13 18:22pm
   
That is reasonable,updated my answer.
 
Thanks.
Sergey Alexandrovich Kryukov at 13-Feb-13 18:38pm
   
Nice. Thank you.
—SA
Marcus Kramer at 14-Feb-13 9:01am
   
+5. TryParse is the way to go.
Jibesh at 14-Feb-13 12:11pm
   
Thank You marcus
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Solution 1

int number = Convert.ToInt32("string to convert");
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v3
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Solution 5

public static bool TryParse(
    string s,
    out int result
)
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v2
Comments
Manfred R. Bihy at 18-Feb-13 8:43am
   
I'm not sure what value this solution adds considering the quality of solutions 2 & 4.
Care to elaborate what you are trying to accomplish here.

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