C# BitConverter.ToUInt64 Method


The BitConverter.ToUInt64() method in C# is used to return a 64-bit unsigned integer converted from eight bytes at a specified position in a byte array.

Syntax

public static ulong ToUInt64 (byte[] val, int begnIndex);

Example

Above, val is the byte array, whereas begnIndex is the beginning position within val.

 Live Demo

using System;
public class Demo {
   public static void Main() {
      byte[] arr = { 0, 0, 1, 3, 5, 7, 9, 11, 15 };
      int count = arr.Length;
      Console.Write("Byte Array... ");
      for (int i = 0; i < count; i++) {
         Console.Write("\n"+arr[i]);
      }
      Console.WriteLine("\n\nByte Array (String representation) = {0} ",
      BitConverter.ToString(arr));
      for (int i = 1; i < arr.Length - 7; i = i + 8) {
         ulong res = BitConverter.ToUInt64(arr, i);
         Console.WriteLine("\nValue = "+arr[i]);
         Console.WriteLine("Result = "+res);
      }
   }
}

Output

Byte Array...
0
0
1
3
5
7
9
11
15
Byte Array (String representation) = 00-00-01-03-05-07-09-0B-0F
Value = 0
Result = 1083970061066240256

Example

 Live Demo

using System;
public class Demo {
   public static void Main() {
      byte[] arr = { 0, 0, 1, 3, 5, 7, 9, 11, 15, 0, 1, 6, 8, 10, 20, 25, 36, 34 };
      int count = arr.Length;
      Console.Write("Byte Array... ");
      for (int i = 0; i < count; i++) {
         Console.Write("\n"+arr[i]);
      }
      Console.WriteLine("\n\nByte Array (String representation) = {0} ",BitConverter.ToString(arr));
      for (int i = 1; i < arr.Length - 7; i = i + 8) {
         ulong res = BitConverter.ToUInt64(arr, i);
         Console.WriteLine("\nValue = "+arr[i]);
         Console.WriteLine("Result = "+res);
      }
   }
}

Output

Byte Array...
0
0
1
3
5
7
9
11
15
0
1
6
8
10
20
25
36
34
Byte Array (String representation) = 00-00-01-03-05-07-09-0B-0F-00-01-06-08-0A-14-19-24-22
Value = 0
Result = 1083970061066240256
Value = 0
Result = 2601132293100011776
raja
Published on 02-Dec-2019 12:39:22
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