Int64.Parse(String) Method in C# with Examples
Last Updated :
12 Jul, 2025
Int64.Parse(String) Method is used to convert the string representation of a number to its 64-bit signed integer equivalent.
Syntax:
public static long Parse (string str);
Here,
str is a string containing a number to convert. The format of
str will be
[optional white space][optional sign]digits[optional white space].
Return Value: It is a 64-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:
csharp
// C# program to demonstrate
// Int64.Parse(String) Method
using System;
class GFG {
// Main Method
public static void Main()
{
// passing different values
// to the method to check
checkParse("9223372036854775807");
checkParse("29,22337,20368547");
checkParse("-922337203685477");
checkParse(" 9223372075807");
}
// Defining checkParse method
public static void checkParse(string input)
{
try {
// declaring Int64 variable
long val;
// getting parsed value
val = Int64.Parse(input);
Console.WriteLine("'{0}' parsed as {1}", input, val);
}
catch (FormatException)
{
Console.WriteLine("Can't Parsed '{0}'", input);
}
}
}
Output:
'9223372036854775807' parsed as 9223372036854775807
Can't Parsed '29,22337,20368547'
'-922337203685477' parsed as -922337203685477
' 9223372075807' parsed as 9223372075807
Example 2: For
ArgumentNullException
csharp
// C# program to demonstrate
// Int64.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 Int64 variable
long val;
// getting parsed value
val = Int64.Parse(input);
Console.WriteLine("'{0}' parsed as {1}", input, val);
}
}
Output:
Exception Thrown: System.ArgumentNullException
Reference:
