C# | BitConverter.ToUInt64 Method
This method 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[] value, int startIndex);
Parameters:
value: It is an array of bytes.
startIndex: It is the starting position within value.
Return Value: This method returns a 64-bit unsigned integer formed by the eight bytes beginning at startIndex.
Exceptions:
- ArgumentException: If 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.ToUInt64 Method:
Example 1:
C#
// C# program to demonstrate // BitConverter.ToUInt64(Byte[], Int32); // Method using System; 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" + " ulong value" ); for ( int index = 0; index < bytes.Length - 7; index = index + 8) { ulong values = BitConverter.ToUInt64(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(); } } |
Output:
Initial Array: 32 0 0 42 0 65 0 125 0 197 0 168 3 41 4 125 32 index byte Array ulong 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
C#
// C# program to demonstrate // BitConverter.ToUInt64(Byte[], Int32); // Method using System; 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 element" + " ulong 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); ulong values = BitConverter.ToUInt64(bytes, index); Console.WriteLine( " {0} {1} {2}" , index, BitConverter.ToString(bytes, index, 8), values); } else { ulong values = BitConverter.ToUInt64(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( "initial Array in string: {0} " , BitConverter.ToString(myArr)); Console.WriteLine(); } } |
Output:
Initial Array: 32 0 0 42 0 65 0 125 0 197 0 168 3 41 4 125 32 initial Array in string: 20-00-00-2A-00-41-00-7D-00-C5-00-A8-03-29-04-7D-20 index element ulong value 0 20-00-00-2A-00-41-00-7D 9007270723701440544 8 00-C5-00-A8-03-29-04-7D 9008370250328098048 Exception Thrown: System.ArgumentException
Example 3: For ArgumentNullException
C#
// C# program to demonstrate // BitConverter.ToUInt64(Byte[], Int32); // Method using System; class GFG { // Main Method public static void Main() { try { // Define an array of byte values. byte [] bytes = null ; // get the long value ulong values = BitConverter.ToUInt64(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); } } } |
Output:
Exception Thrown: System.ArgumentNullException
Reference:
- https://docs.microsoft.com/en-us/dotnet/api/system.bitconverter.touint64?view=netframework-4.7.2