Convert.ToInt64 Method (Byte)

Converts the value of the specified 8-bit unsigned integer to the equivalent 64-bit signed integer.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public static long ToInt64(
	byte value
)

Parameters

value
Type: System.Byte

The 8-bit unsigned integer to convert.

Return Value

Type: System.Int64
A 64-bit signed integer that is equivalent to value.

The following example converts each element in an array of bytes to a long integer.

byte[] bytes = { Byte.MinValue, 14, 122, Byte.MaxValue};
long result;

foreach (byte byteValue in bytes)
{
   result = Convert.ToInt64(byteValue);
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                     byteValue.GetType().Name, byteValue,
                     result.GetType().Name, result);
}
// The example displays the following output: 
//       Converted the Byte value 0 to the Int64 value 0. 
//       Converted the Byte value 14 to the Int64 value 14. 
//       Converted the Byte value 122 to the Int64 value 122. 
//       Converted the Byte value 255 to the Int64 value 255.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, 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.

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