BitConverter.ToInt64 Method
Returns a 64-bit signed integer converted from eight bytes at a specified position in a byte array.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Parameters
- value
- Type: System.Byte[]
An array of bytes.
- startIndex
- Type: System.Int32
The starting position within value.
Return Value
Type: System.Int64A 64-bit signed integer formed by eight bytes beginning at startIndex.
| Exception | Condition |
|---|---|
| ArgumentException | 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 | value is null. |
| ArgumentOutOfRangeException | startIndex is less than zero or greater than the length of value minus 1. |
The ToInt64 method converts the bytes from index startIndex to startIndex + 7 to a Int64 value. The order of bytes in the array must reflect the endianness of the computer system's architecture; for more information, see the Remarks section of the BitConverter class topic.
The following code example converts elements of Byte arrays to Int64 values with the ToInt64 method.
// Example of the BitConverter.ToInt64 method. using System; class BytesToInt64Demo { const string formatter = "{0,5}{1,27}{2,24}"; // Convert eight byte array elements to a long and display it. public static void BAToInt64( byte[ ] bytes, int index ) { long value = BitConverter.ToInt64( bytes, index ); Console.WriteLine( formatter, index, BitConverter.ToString( bytes, index, 8 ), value ); } // Display a byte array, using multiple lines if necessary. public static void WriteMultiLineByteArray( byte[ ] bytes ) { const int rowSize = 20; int iter; Console.WriteLine( "initial byte array" ); Console.WriteLine( "------------------" ); for( iter = 0; iter < bytes.Length - rowSize; iter += rowSize ) { Console.Write( BitConverter.ToString( bytes, iter, rowSize ) ); Console.WriteLine( "-" ); } Console.WriteLine( BitConverter.ToString( bytes, iter ) ); Console.WriteLine( ); } public static void Main( ) { byte[ ] byteArray = { 0, 54, 101, 196, 255, 255, 255, 255, 0, 0, 0, 0, 0, 0, 0, 0, 128, 0, 202, 154, 59, 0, 0, 0, 0, 1, 0, 0, 0, 0, 255, 255, 255, 255, 1, 0, 0, 255, 255, 255, 255, 255, 255, 255, 127, 86, 85, 85, 85, 85, 85, 255, 255, 170, 170, 170, 170, 170, 170, 0, 0, 100, 167, 179, 182, 224, 13, 0, 0, 156, 88, 76, 73, 31, 242 }; Console.WriteLine( "This example of the BitConverter.ToInt64( byte[ ], " + "int ) \nmethod generates the following output. It " + "converts elements \nof a byte array to long values.\r\n" ); WriteMultiLineByteArray( byteArray ); Console.WriteLine( formatter, "index", "array elements", "long" ); Console.WriteLine( formatter, "-----", "--------------", "----" ); // Convert byte array elements to long values. BAToInt64( byteArray, 8 ); BAToInt64( byteArray, 5 ); BAToInt64( byteArray, 34 ); BAToInt64( byteArray, 17 ); BAToInt64( byteArray, 0 ); BAToInt64( byteArray, 21 ); BAToInt64( byteArray, 26 ); BAToInt64( byteArray, 53 ); BAToInt64( byteArray, 45 ); BAToInt64( byteArray, 59 ); BAToInt64( byteArray, 67 ); BAToInt64( byteArray, 37 ); BAToInt64( byteArray, 9 ); } } /* This example of the BitConverter.ToInt64( byte[ ], int ) method generates the following output. It converts elements of a byte array to long values. initial byte array ------------------ 00-36-65-C4-FF-FF-FF-FF-00-00-00-00-00-00-00-00-80-00-CA-9A- 3B-00-00-00-00-01-00-00-00-00-FF-FF-FF-FF-01-00-00-FF-FF-FF- FF-FF-FF-FF-7F-56-55-55-55-55-55-FF-FF-AA-AA-AA-AA-AA-AA-00- 00-64-A7-B3-B6-E0-0D-00-00-9C-58-4C-49-1F-F2 index array elements long ----- -------------- ---- 8 00-00-00-00-00-00-00-00 0 5 FF-FF-FF-00-00-00-00-00 16777215 34 01-00-00-FF-FF-FF-FF-FF -16777215 17 00-CA-9A-3B-00-00-00-00 1000000000 0 00-36-65-C4-FF-FF-FF-FF -1000000000 21 00-00-00-00-01-00-00-00 4294967296 26 00-00-00-00-FF-FF-FF-FF -4294967296 53 AA-AA-AA-AA-AA-AA-00-00 187649984473770 45 56-55-55-55-55-55-FF-FF -187649984473770 59 00-00-64-A7-B3-B6-E0-0D 1000000000000000000 67 00-00-9C-58-4C-49-1F-F2 -1000000000000000000 37 FF-FF-FF-FF-FF-FF-FF-7F 9223372036854775807 9 00-00-00-00-00-00-00-80 -9223372036854775808 */
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
