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 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 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 a null 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 throw OverflowException. 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 null reference, 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 s represents 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.