C# | Convert.ToInt64(String, IFormatProvider) Method

This method is used to converts the specified string representation of a number to an equivalent 64-bit signed integer, using the specified culture-specific formatting information.

Syntax:

public static long ToInt64 (string value, IFormatProvider provider);

Parameters:

  • value: It is a string that contains the number to convert.
  • provider: It is an object that supplies culture-specific formatting information.

Return Value: This method returns a decimal number which is equivalent to the number in value, or 0 (zero) if value is null.

Exceptions:

  • FormatException: If the value does not consist of an optional sign followed by a sequence of digits (0 through 9).
  • OverFlowException: If the value represents a number that is less than MinValue or greater than MaxValue.

Below programs illustrate the use of Convert.ToInt64(String, IFormatProvider) Method:

Example 1:

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// C# program to demonstrate the
// Convert.ToInt64() Method
using System;
using System.Globalization;
  
class GFG {
  
// Main Method
public static void Main()
{
    try {
  
        // creating object of CultureInfo
        CultureInfo cultures = new CultureInfo("en-US");
  
        // declaring and intializing String array
        string[] values = {"12345", "+12345",
                                   "-12345"};
  
        // calling get() Method
        Console.Write("Converted long value"
                    + " from a specified sttring ");
  
        for (int j = 0; j < values.Length; j++) 
        {
            get(values[j], cultures);
        }
    }
  
    catch (FormatException e)
    {
        Console.WriteLine("\n");
        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
  
    catch (OverflowException e)
    {
        Console.WriteLine("\n");
        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
}
  
// Defining get() method
public static void get(string s,
           CultureInfo cultures)
{
  
    // converting string to specified long
    long val = Convert.ToInt64(s, cultures);
  
    // display the converted long value
    Console.Write(" {0}, ", val);
}
}

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Output:

Converted long value from a specified sttring  12345,  12345,  -12345,

Example 2: For FormatException

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// C# program to demonstrate the
// Convert.ToInt64() Method
using System;
using System.Globalization;
  
class GFG {
  
// Main Method
public static void Main()
{
      
    try {
  
        // creating object of CultureInfo
        CultureInfo cultures = new CultureInfo("en-US");
  
        // declaring and intializing String array
        string[] values = {"12345", "+12345",
                                   "-12345"};
  
        // calling get() Method
        Console.Write("Converted long value"
                    + " of specified strings: ");
  
        for (int j = 0; j < values.Length; j++) 
        {
            get(values[j], cultures);
        }
  
        Console.WriteLine("\n");
        string s = "123 456, 789";
  
        Console.WriteLine("format of s is invalid ");
  
        // converting string to specified char
        long val = Convert.ToInt64(s, cultures);
  
        // display the converted char value
        Console.Write(" {0}, ", val);
    }
  
    catch (FormatException e)
    {
        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
  
    catch (OverflowException e) 
    {
        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
}
  
// Defining get() method
public static void get(string s,
           CultureInfo cultures)
{
  
    // converting string to
    // specified long value
    long val = Convert.ToInt64(s, cultures);
  
    // display the converted
    // decimal value
    Console.Write(" {0}, ", val);
}
}

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Output:

Converted long value of specified strings:  12345,  12345,  -12345, 

format of s is invalid 
Exception Thrown: System.FormatException

Example 3: For OverflowException

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// C# program to demonstrate the
// Convert.ToInt64() Method
using System;
using System.Globalization;
  
class GFG {
  
// Main Method
public static void Main()
{
  
    try {
  
        // creating object of CultureInfo
        CultureInfo cultures = new CultureInfo("en-US");
  
        // declaring and intializing String array
        string[] values = {"12345", "+12345",
                                   "-12345"};
  
        // calling get() Method
        Console.Write("Converted long value "
                 + "of specified strings: ");
  
        for (int j = 0; j < values.Length; j++)
        {
            get(values[j], cultures);
        }
  
        Console.WriteLine("\n");
        string s = "-7922816251426433759354395033500000";
  
        Console.WriteLine("s is less than the MinValue");
  
        // converting string to specified long
        long val = Convert.ToInt64(s, cultures);
  
        // display the converted char value
        Console.Write(" {0}, ", val);
    }
  
    catch (FormatException e)
    {
        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
  
    catch (OverflowException e) 
    {
        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
}
  
// Defining get() method
public static void get(string s,
           CultureInfo cultures)
{
  
    // converting string to
    // specified long value
    long val = Convert.ToInt64(s, cultures);
  
    // display the converted long value
    Console.Write(" {0}, ", val);
}
}

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Output:

Converted long value of specified strings:  12345,  12345,  -12345, 

s is less than the MinValue
Exception Thrown: System.OverflowException

Reference:



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