public static int ConvertToInt32(string integerAsString) { var result = 0; var positiveSigned = integerAsString[0] == '+'; var negativeSigned = integerAsString[0] == '-'; for (var i = (positiveSigned || negativeSigned) ? 1 : 0; i < integerAsString.Length; i++) { var currentCharAsInt = (int) integerAsString[i] - (int) '0'; if (currentCharAsInt < 0 || currentCharAsInt > 9) throw new ArgumentException( string.Format("The String value '{0}' " + "is not in a recognisable format.", integerAsString)); result *= 10; result += currentCharAsInt; } return (negativeSigned) ? -result : result; }
Sunday 15 July 2012
Implementing Convert.ToInt32(string)
Earlier today I used the static helper method System.Convert.ToInt32(string). I thought it would be interesting to have a go at writing my own version of this method.
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