Public static int ParseInt(this string value, int defaultIntValue = 0) Make Some Helper Methods to Simplify Converting a C# String to IntĪ good way to simplify your TryParse code is to make your own helper methods via C# extension methods. You could make extension methods to support different default values or nullable integers. NET, Java, PHP, Node.js, Ruby, and Python. Try Stackify’s free code profiler, Prefix, to write better code on your workstation. If (int.TryParse(incomingData, out parsedResult)) If you need to know the difference between the incomingData being 0 and just defaulting to 0, you will need to actually use the boolean result of TryParse to know if it actually parsed or not. The only problem is that the variable parsedResult will end up being a 0 if the TryParse fails. Int.TryParse(incomingData, out parsedResult) Below is an example of how to properly use it. NET Framework provides int.TryParse which is designed for this exact problem. In this example, possible exceptions converting a string to int. You should definitely handle potential exceptions when parsing data and converting datatypes. How to Prevent Exceptions When Converting a C# String to Intīad data is inevitable. Return int.Parse(value, (IFormatProvider) CultureInfo.CurrentCulture) If we peek under the covers to see what the source code for Convert.ToInt32() does, you can see it has special logic to look for null and calls int.Parse internally. The built-in methods Convert.ToInt32() and int.Parse() produce the same results, except for the null string scenario. Var i2 = Convert.ToInt32((string) null) //No exception! returns 0Ĭonvert.ToInt32("hello") //throws exceptionĬonvert.ToInt32("1.5") //throws exception int.Parse((string) null) // throws exception Both of these would throw an exception if the string value is not a valid integer. You can use a couple built in methods, as shown below, to convert a string to int. Unsafe Ways to Convert a C# String to Int It is important that you do so in a way that does not throw potential exceptions. NET Framework provides a couple built in ways to convert a C# string to int, or several other numeric datatypes. The Integer class methods ( parseInt(), valueOf(), decode()) throw a NumberFormatException if the string is not a parsable integer.The. nextInt ( ) ) // 189 NumberFormatException Exception The nextInt() method scans the next token of the input as a primitive int: System. println (num3 ) Convert a string to an integer using ScannerĪlthough not very popular, the Scanner class can also be used to convert a string into an integer. decode ( "4MB" ) // NumberFormatException System. println (num2 ) // 41 Integer num3 = Integer. println (num1 ) // 489 Integer num2 = Integer. If the string is not parsable, a NumberFormatException is thrown: Integer num1 = Integer. The decode() static method accepts one parameter, a string, and decodes it into an Integer object. println (num3 ) Convert a string to an integer using code() valueOf ( "49%" ) // NumberFormatException System. println (num2 ) // 32 Integer num3 = Integer. println (num1 ) // 19 Integer num2 = Integer. The NumberFormatException is thrown if the string is not a parsable integer: Integer num1 = Integer. But it, unlike the parseInt() method, returns an Integer object instead of a primitive int value. The valueOf() static method converts a string into an integer. Here is the output for the above conversion: Exception in thread "main" : For input string: "19.49"Īt (NumberFormatException.java:65 )Īt (Integer.java:580 )Īt (Integer.java:615 ) Convert a string to an integer using Integer.valueOf() ), the parseInt() method throws a NumberFormatException: String str = "19.49" int price = Integer. If the string contains non-digit characters, even a dot (. println (num ) // 85 // with radix 16 String strBase16 = "100" int num2 = Integer. The second optional argument is the base number called radix: String str = "85" int num = Integer. The first argument is the string to convert. The parseInt() static method from Integer class converts a string into a primitive integer ( int). Convert a string to an integer using Integer.parseInt() If you want to convert an integer to a string, read this article. Let us go through these methods one by one. There are multiple ways available to do this simple conversion in Java. A string to an integer conversion is one of the most used operations while writing code.
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