C# | BitConverter.ToInt64() Method

This method is used to return a 64-bit signed integer converted from eight bytes at a specified position in a byte array.

Syntax:

public static long ToInt64 (byte[] value, int startIndex);

Parameters:



value: It is an array of bytes.
startIndex: It is the starting position within the value.

Return Value: This method returns a 64-bit signed integer formed by two bytes beginning at startIndex.

Exceptions:

  • ArgumentException: If the startIndex is greater than or equal to the length of value minus 7, and is less than or equal to the length of value minus 1.
  • ArgumentNullException: If the value is null.
  • ArgumentOutOfRangeException: If the startIndex is less than zero or greater than the length of value minus 1.

Below programs illustrate the use of BitConverter.ToInt64(Byte[], Int32) Method:

Example 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// C# program to demonstrate
// BitConverter.ToInt64(Byte[], Int32);
// Method
using System;
  
public class GFG {
  
    // Main Method
    public static void Main()
    {
  
        try {
  
            // Define an array of byte values.
            byte[] bytes = {32, 0, 0, 42, 0, 
                            65, 0, 125, 0, 197, 
                            0, 168, 3, 41, 4, 
                                     125, 32};
  
            // Display the values of the myArr.
            Console.Write("Initial Array: ");
  
            // calling the PrintIndexAndValues()
            // method to print
            PrintIndexAndValues(bytes);
  
            // print char value
            Console.WriteLine("index       byte Array"+                    
             "                            long value");
              
            for (int index = 0; index < bytes.Length - 7;
                                     index = index + 8) {
  
                long values = BitConverter.ToInt64(bytes, index);
  
                Console.WriteLine(" {0}     {1}         {2}",
                       index, BitConverter.ToString(bytes,
                                       index, 8), values);
            }
        }
        catch (ArgumentNullException e) {
  
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentOutOfRangeException e) {
  
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentException e) {
  
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
  
    // Defining the method
    // PrintIndexAndValues
    public static void PrintIndexAndValues(byte[] myArr)
    {
        for (int i = 0; i < myArr.Length; i++) {
  
            Console.Write("{0} ", myArr[i]);
        }
  
        Console.WriteLine();
        Console.WriteLine();
    }
}

chevron_right


Output:

Initial Array: 32 0 0 42 0 65 0 125 0 197 0 168 3 41 4 125 32 

index       byte Array                            long value
 0     20-00-00-2A-00-41-00-7D         9007270723701440544
 8     00-C5-00-A8-03-29-04-7D         9008370250328098048

Example 2: For ArgumentException

filter_none

edit
close

play_arrow

link
brightness_4
code

// C# program to demonstrate
// BitConverter.ToInt64(Byte[], Int32);
// Method
using System;
  
public class GFG {
  
    // Main Method
    public static void Main()
    {
  
        try {
  
            // Define an array of byte values.
        byte[] bytes = {32, 0, 0, 42, 0, 65, 
                        0, 125, 0, 197, 0, 
                        168, 3, 41, 4, 125};
  
            // Display the values of the myArr.
            Console.Write("Initial Array: ");
  
            // calling the PrintIndexAndValues()
            // method to print
            PrintIndexAndValues(bytes);
  
            // print char value
            Console.WriteLine("index       element"+                    
             "                        float value");
               
            for (int index = 1; index < bytes.Length - 6;
                                     index = index + 8) {
  
                if (index == bytes.Length - 7) {
  
                    Console.WriteLine();
                    Console.WriteLine("startindex is {0} which is equals"+
                               " to the length of Array minus 7.", index);
                                 
                    long values = BitConverter.ToInt64(bytes, index);
                      
                    Console.WriteLine(" {0}     {1}         {2}", index,
                                         BitConverter.ToString(bytes, 
                                                  index, 8), values);
                }
                else {
                    long values = BitConverter.ToInt64(bytes, index);
                    Console.WriteLine(" {0}     {1}         {2}",
                           index, BitConverter.ToString(bytes, 
                                           index, 8), values);
                }
            }
        }
        catch (ArgumentNullException e) {
  
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentOutOfRangeException e) {
  
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentException e) {
  
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
  
    // Defining the method
    // PrintIndexAndValues
    public static void PrintIndexAndValues(byte[] myArr)
    {
        for (int i = 0; i < myArr.Length; i++) {
  
            Console.Write("{0} ", myArr[i]);
        }
  
        Console.WriteLine();
        Console.WriteLine();
        Console.WriteLine("intial Array in string: {0} "
                           BitConverter.ToString(myArr));
        Console.WriteLine();
    }
}

chevron_right


Output:

Initial Array: 32 0 0 42 0 65 0 125 0 197 0 168 3 41 4 125 

intial Array in string: 20-00-00-2A-00-41-00-7D-00-C5-00-A8-03-29-04-7D 

index       element                        float value
 1     00-00-2A-00-41-00-7D-00         35184651264458752

startindex is 9 which is equals to the length of Array minus 7.
Exception Thrown: System.ArgumentException

Example 3: For ArgumentOutOfRangeException

filter_none

edit
close

play_arrow

link
brightness_4
code

// C# program to demonstrate
// BitConverter.ToInt64(Byte[], Int32);
// Method
using System;
  
public class GFG {
  
    // Main Method
    public static void Main()
    {
  
        try {
  
            // Define an array of byte values.
            byte[] bytes = {32, 0, 0, 42, 0, 65,
                            0, 125, 0, 197, 0, 
                            168, 3, 41, 4, 125};
  
            // Display the values of the myArr.
            Console.Write("Initial Array: ");
  
            // calling the PrintIndexAndValues()
            // method to print
            PrintIndexAndValues(bytes);
  
            // print char value
            Console.WriteLine("index         element"+
                     "                  float value");
                       
            for (int index = 0; index < bytes.Length + 1;
                                    index = index + 8) {
  
                if (index == bytes.Length) {
  
                    Console.WriteLine();
                    Console.WriteLine("startindex is {0} which is greater"+
                               " than the Length of array minus 1", index);
                                 
                    long values = BitConverter.ToInt64(bytes, index);
                      
                    Console.WriteLine(" {0}     {1}         {2}", index, 
                                         BitConverter.ToString(bytes, 
                                                  index, 8), values);
                }
                else {
                    long values = BitConverter.ToInt64(bytes, index);
                    Console.WriteLine(" {0}     {1}         {2}"
                           index, BitConverter.ToString(bytes, 
                                           index, 8), values);
                }
            }
        }
        catch (ArgumentNullException e) {
  
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentOutOfRangeException e) {
  
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentException e) {
  
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
  
    // Defining the method
    // PrintIndexAndValues
    public static void PrintIndexAndValues(byte[] myArr)
    {
        for (int i = 0; i < myArr.Length; i++) {
  
            Console.Write("{0} ", myArr[i]);
        }
  
        Console.WriteLine();
        Console.WriteLine();
        Console.WriteLine("Intial Array in string: {0} "
                           BitConverter.ToString(myArr));
        Console.WriteLine();
    }
}

chevron_right


Output:

Initial Array: 32 0 0 42 0 65 0 125 0 197 0 168 3 41 4 125 

Intial Array in string: 20-00-00-2A-00-41-00-7D-00-C5-00-A8-03-29-04-7D 

index         element                  float value
 0     20-00-00-2A-00-41-00-7D         9007270723701440544
 8     00-C5-00-A8-03-29-04-7D         9008370250328098048

startindex is 16 which is greater than the Length of array minus 1
Exception Thrown: System.ArgumentOutOfRangeException

Example 4: For ArgumentNullException

filter_none

edit
close

play_arrow

link
brightness_4
code

// C# program to demonstrate
// BitConverter.ToInt64(Byte[], Int32);
// Method
using System;
  
public class GFG {
  
    // Main Method
    public static void Main()
    {
  
        try {
  
            // Define an array of byte values.
            byte[] bytes = null;
  
            // get the long value
  
            long values = BitConverter.ToInt64(bytes, 0);
            Console.Write("{0}", values);
        }
        catch (ArgumentNullException e) {
  
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentOutOfRangeException e) {
  
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
        catch (ArgumentException e) {
  
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

chevron_right


Output:

Exception Thrown: System.ArgumentNullException

Reference:



My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.