BitConverter.ToInt64 Method
.NET Framework 4
Returns a 64-bit signed integer converted from eight bytes at a specified position in a byte array.
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 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 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
