MSDN to the rescue! Have a look at the very first line in the 'Remarks' section for, say, Convert. ToInt32 string. Blow me down! It talks about Parse! I'm not going to spoil the learning experience by telling you what it says. The content you requested has been removed.
Ask a question. Quick access. ToInt32 string s method converts the specified string representation of bit signed integer equivalent. This calls in turn Int Parse method.
When s is a null reference, it will return 0 rather than throw ArgumentNullException. The first of these functions, Parse, is one that should be familiar to any.
Net developer. This function will take a string and attempt to extract an integer out of it and then return the integer. Also, it can throw an ArgumentException if you pass it a null value.
TryParse is a new addition to the new. Net 2. The main difference is that exception handling is very slow, so if TryParse is unable to parse the string it does not throw an exception like Parse does. Instead, it returns a Boolean indicating if it was able to successfully parse a number. So you have to pass into TryParse both the string to be parsed and an Int32 out parameter to fill in.
We will use the profiler to examine the speed difference between TryParse and Parse in both cases where the string can be correctly parsed and in cases where the string cannot be correctly parsed. The Convert class contains a series of functions to convert one base class into another. I believe that Convert. ToInt32 string just checks for a null string if the string is null it returns zero unlike the Parse then just calls Int Parse string.
Source with examples. ToInt32 allows null value, it doesn't throw any errors Int. It depends on the parameter type. Not exactly the functionality I intended Here is a detail for int.
Parse and Convert. The Convert. ToInt32 a[0] will give you a number of Parse a[0] will give you the right output which is 1. ToInt32 and int. Parse will have no difference in output. Both return the right integer.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. What's the main difference between int. ToInt32 Ask Question. Asked 13 years, 1 month ago. Active 2 years, 7 months ago.
Viewed k times. What is the main difference between int. Which one is to be preferred. Improve this question. Add a comment. Active Oldest Votes.
See Chris S's answer for how it works Convert. Improve this answer. Community Bot 1 1 1 silver badge. Dave Markle Dave Markle 90k 20 20 gold badges silver badges bronze badges. As others point out, Convert. ToInt32 s doesn't throw an exception when s is null, but Parse does. Thanks, Robert! I'm editing my answer for some more completeness. But as far as performance goes, I'll bet the difference in speed would be detectable if you're calling it in a nested loop Actually, since the ToInt32 method has an overload for loads of types, there among them System.
String , no time will be lost discerning the type. The actual code does nothing but return 0 for null values, and int. Parse value, CultureInfo. CurrentCulture for everything else. StealthRabbi: In the "Return value" section of the documentation: "A bit signed integer that is equivalent to the number in value, or 0 zero if value is null.
TryParse in Convert. ToInt32 because it is incorrect. Convert throws an exception if the string is formatted incorrectly. Show 3 more comments. Have a look in reflector: int. Empty fails to parse successfully. You can check for a null or empty string before attempting to parse it by calling the String.
IsNullOrEmpty method. The following example demonstrates both successful and unsuccessful calls to Parse and TryParse. The following example illustrates one approach to parsing a string expected to include leading numeric characters including hexadecimal characters and trailing non-numeric characters.
It assigns valid characters from the beginning of a string to a new string before calling the TryParse method. Because the strings to be parsed contain a few characters, the example calls the String. Concat method to assign valid characters to a new string. For a larger string, the StringBuilder class can be used instead. The following table lists some of the methods from the Convert class that you can use to convert a string to a number. The following example calls the Convert.
ToInt32 String method to convert an input string to an int. The example catches the two most common exceptions that can be thrown by this method, FormatException and OverflowException. If the resulting number can be incremented without exceeding Int MaxValue , the example adds 1 to the result and displays the output.
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