Represents an 8-bit unsigned integer.
Assembly: mscorlib (in mscorlib.dll)
is an immutable value type that represents unsigned integers with values that range from 0 (which is represented by the Byte.MinValue constant) to 255 (which is represented by the Byte.MaxValue constant). The .NET Framework also includes a signed 8-bit integer value type, SByte, which represents values that range from -128 to 127.
Instantiating a Byte Value
You can instantiate a value in several ways:
You can declare a variable and assign it a literal integer value that is within the range of the data type. The following example declares two variables and assigns them values in this way.
You can assign a non-byte numeric value to a byte. This is a narrowing conversion, so it requires a cast operator in C# and a conversion method in Visual Basic if Option Strict is on. If the non-byte value is a Single, Double, or Decimal value that includes a fractional component, its fractional part is truncated. The following example assigns several numeric values to variables.
You can call a method of the Convert class to convert any supported type to a value. This is possible because supports the IConvertible interface. The following example illustrates the conversion of an array of Int32 values to values.
You can call the Parse or TryParse method to convert the string representation of a value to a . The string can contain either decimal or hexadecimal digits. The following example illustrates the parse operation by using both a decimal and a hexadecimal string.
Performing Operations on Byte Values
The type supports standard mathematical operations such as addition, subtraction, division, multiplication, subtraction, negation, and unary negation. Like the other integral types, the type also supports the bitwise AND, OR, XOR, left shift, and right shift operators.
Representing a Byte as a String
The type provides full support for standard and custom numeric format strings. (For more information, see Formatting Overview, Standard Numeric Format Strings, and Custom Numeric Format Strings.) However, most commonly, byte values are represented as one-digit to three-digit values without any additional formatting, or as two-digit hexadecimal values.
To format a value as an integral string with no leading zeros, you can call the parameterless ToString() method. By using the "D" format specifier, you can also include a specified number of leading zeros in the string representation. By using the "X" format specifier, you can represent a value as a hexadecimal string. The following example formats the elements in an array of values in these three ways.
You can also format a value as a binary, octal, decimal, or hexadecimal string by calling the ToString(Byte, Int32) method and supplying the base as the method's second parameter. The following example calls this method to display the binary, octal, and hexadecimal representations of an array of byte values.
Working with Non-Decimal Byte Values
In addition to working with individual bytes as decimal values, you may want to perform bitwise operations with byte values, or work with byte arrays or with the binary or hexadecimal representations of byte values. For example, overloads of the BitConverter.GetBytes method can convert each of the primitive data types to a byte array.
values are represented in 8 bits by their magnitude only, without a sign bit. This is important to keep in mind when you perform bitwise operations on values or when you work with individual bits. In order to perform a numeric, Boolean, or comparison operation on any two non-decimal values, both values must use the same representation.
When an operation is performed on two values, the values share the same representation, so the result is accurate. This is illustrated in the following example, which masks the lowest-order bit of a value to ensure that it is even.
On the other hand, when you work with both unsigned and signed bits, bitwise operations are complicated by the fact that the SByte values use sign-and-magnitude representation for positive values, and two's complement representation for negative values. In order to perform a meaningful bitwise operation, the values must be converted to two equivalent representations, and information about the sign bit must be preserved. The following example does this to mask out bits 2 and 4 of an array of 8-bit signed and unsigned values.
All members of this type are thread safe. Members that appear to modify instance state actually return a new instance initialized with the new value. As with any other type, reading and writing to a shared variable that contains an instance of this type must be protected by a lock to guarantee thread safety.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.