Difference Between Int32.Parse(), Convert.ToInt32(), and Int32.TryParse()

 

Int32.parse(string)

Int32.Parse (string s) method converts the string representation of a number to its 32-bit signed integer equivalent. When s is a null reference, it will throwArgumentNullException. If s is other than integer value, it will throwFormatException. When s represents a number less than MinValue or greater thanMaxValue, it will throw OverflowException. For example: 

     string s1 = "1234";

            string s2 = "1234.65";

            string s3 = null;

            string s4 = "123456789123456789123456789123456789123456789";

            int result;

            bool success;

            result = Int32.Parse(s1); //-- 1234

            result = Int32.Parse(s2); //-- FormatException

            result = Int32.Parse(s3); //-- ArgumentNullException

            result = Int32.Parse(s4); //-- OverflowException

Convert.ToInt32(string)

Convert.ToInt32(string s) method converts the specified string representation of 32-bit signed integer equivalent. This calls in turn Int32.Parse () method. When s is anull reference, it will return 0 rather than throw ArgumentNullException. If s is other than integer value, it will throw FormatException. When s represents a number less than MinValue or greater than MaxValue, it will throwOverflowException. For example: 

     result = Convert.ToInt32(s1); //-- 1234

            result = Convert.ToInt32(s2); //-- FormatException

            result = Convert.ToInt32(s3); //-- 0

            result = Convert.ToInt32(s4); //-- OverflowException

Int32.TryParse(string, out int)

Int32.Parse(string, out int) method converts the specified string representation of 32-bit signed integer equivalent to out variable, and returns true if it is parsed successfully, false otherwise. This method is available in C# 2.0. When s is a nullreference, it will return 0 rather than throw ArgumentNullException. If s is other than an integer value, the out variable will have 0 rather than FormatException. When srepresents a number less than MinValue or greater than MaxValue, the out variable will have 0 rather than OverflowException. For example: 

success = Int32.TryParse(s1, out result); //-- success => true; result => 1234

success = Int32.TryParse(s2, out result); //-- success => false; result => 0

success = Int32.TryParse(s3, out result); //-- success => false; result => 0

success = Int32.TryParse(s4, out result); //-- success => false; result => 0

Convert.ToInt32 is better than Int32.Parse since it returns 0 rather than an exception. But again, according to the requirement, this can be used. TryParse will be the best since it always handles exceptions by itself.

The Convert.ToInt32(String, IFormatProvider) underneath calls the Int32.Parse. So the only difference is that if a null string is passed to Convert it returns 0, whereas Int32.Parse throws an ArgumentNullException.