Int32.Parse(String) Method in C# with Examples

Int32.Parse(String) Method is used to convert the string representation of a number to its 32-bit signed integer equivalent.

Syntax:

public static int Parse (string str);

Here, str is a string that contains a number to convert. The format of str will be [optional white space][optional sign]digits[optional white space].

Return Value: It is a 32-bit signed integer equivalent to the number contained in str.

Exceptions:

ArgumentNullException: If str is null.
FormatException: If str is not in the correct format.
OverflowException: If str represents a number less than MinValue or greater than MaxValue.

Below programs illustrate the use of above-discussed method:

Example 1:

// C# program to demonstrate 
// Int32.Parse(String) Method 
using System; 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
  
        // passing different values 
        // to the method to check 
        checkParse("2147483647"); 
        checkParse("214,7483,647"); 
        checkParse("-2147483"); 
        checkParse(" 2183647 "); 
    } 
  
    // Defining checkParse method 
    public static void checkParse(string input) 
    { 
  
        try { 
  
            // declaring Int32 variable 
            int val; 
  
            // getting parsed value 
            val = Int32.Parse(input); 
            Console.WriteLine("'{0}' parsed as {1}", input, val); 
        } 
  
        catch (FormatException) { 
            Console.WriteLine("Can't Parsed '{0}'", input); 
        } 
    } 
} 

Output:

'2147483647' parsed as 2147483647
Can't Parsed '214,7483,647'
'-2147483' parsed as -2147483
' 2183647 ' parsed as 2183647

Example 2: For ArgumentNullException

// C# program to demonstrate 
// Int32.Parse(String) Method 
// for ArgumentNullException 
using System; 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
  
        try { 
  
            // passing null value as a input 
            checkParse(null); 
        } 
        catch (ArgumentNullException e) { 
  
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
        catch (FormatException e) { 
  
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
  
    // Defining checkparse method 
    public static void checkParse(string input) 
    { 
  
        // declaring Int32 variable 
        int val; 
  
        // getting parsed value 
        val = Int32.Parse(input); 
        Console.WriteLine("'{0}' parsed as {1}", input, val); 
    } 
} 

Output:

Exception Thrown: System.ArgumentNullException

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.int32.parse?view=netframework-4.7.2#System_Int32_Parse_System_String_

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