Click here to Skip to main content
11,479,486 members (45,444 online)
Click here to Skip to main content

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

, 27 Jan 2009 CPOL 134.5K 26
Rate this:
Please Sign up or sign in to vote.
Difference between Int32.Parse(), Convert.ToInt32(), and Int32.TryParse()

Introduction

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.

History

  • 27th January, 2009: Initial post

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Author

AgileWare
Software Developer AgileWare
Brazil Brazil
SoftWare Developer.

Comments and Discussions

 
GeneralMy vote of 2 Pin
silverghost00710-May-14 19:09
membersilverghost00710-May-14 19:09 
QuestionBenchmarks on Int.Parse(), Convert.ToInt32(), Int.TryParse() Pin
Member 1024450327-Sep-13 18:12
memberMember 1024450327-Sep-13 18:12 
GeneralMy vote of 5 Pin
desenvolvedor8224-Jan-13 18:40
memberdesenvolvedor8224-Jan-13 18:40 
QuestionThanks for all contributing to the developer community Pin
desenvolvedor8224-Jan-13 18:37
memberdesenvolvedor8224-Jan-13 18:37 
GeneralMy vote of 5 Pin
ssa201018-Jul-12 21:27
memberssa201018-Jul-12 21:27 
SuggestionNice Work AgilWare Pin
Thilina Chandima26-Mar-12 4:30
memberThilina Chandima26-Mar-12 4:30 
GeneralRe: Nice Work AgilWare Pin
Mark Nischalke27-Mar-12 17:08
mvpMark Nischalke27-Mar-12 17:08 
GeneralDifference between int.parse(), int.Tryparse() and Convert.ToInt32() Pin
Member 333565315-May-10 12:43
memberMember 333565315-May-10 12:43 
GeneralGood Article Pin
Member 333565330-Apr-10 9:35
memberMember 333565330-Apr-10 9:35 
GeneralMy vote of 2 Pin
Amit Narula30-Nov-09 6:39
memberAmit Narula30-Nov-09 6:39 
GeneralMy vote of 2 Pin
Stinky Boat18-Nov-09 14:20
memberStinky Boat18-Nov-09 14:20 
GeneralExceptions are not necessarily bad Pin
Omer Mor28-Jan-09 7:22
memberOmer Mor28-Jan-09 7:22 
GeneralMy vote of 2 Pin
Omer Mor28-Jan-09 7:16
memberOmer Mor28-Jan-09 7:16 
GeneralUmm... Pin
PIEBALDconsult27-Jan-09 13:58
memberPIEBALDconsult27-Jan-09 13:58 
GeneralSome comments Pin
Colin Angus Mackay27-Jan-09 7:27
mvpColin Angus Mackay27-Jan-09 7:27 
GeneralRe: Some comments Pin
supercat927-Jan-09 9:05
membersupercat927-Jan-09 9:05 
GeneralRe: Some comments [modified] Pin
Colin Angus Mackay27-Jan-09 9:30
mvpColin Angus Mackay27-Jan-09 9:30 
GeneralRe: Some comments Pin
supercat927-Jan-09 10:26
membersupercat927-Jan-09 10:26 
GeneralRe: Some comments Pin
Colin Angus Mackay27-Jan-09 12:27
mvpColin Angus Mackay27-Jan-09 12:27 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Terms of Use | Mobile
Web03 | 2.8.150520.1 | Last Updated 27 Jan 2009
Article Copyright 2009 by AgileWare
Everything else Copyright © CodeProject, 1999-2015
Layout: fixed | fluid