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Marshal.WriteByte Method (Object, Int32, Byte)

Note: This API is now obsolete.

Writes a single byte value to unmanaged memory at a specified offset.

Namespace:  System.Runtime.InteropServices
Assemblies:   System.Runtime.InteropServices (in System.Runtime.InteropServices.dll)
  mscorlib (in mscorlib.dll)

'Declaration
<ObsoleteAttribute("WriteByte(Object, Int32, Byte) may be unavailable in future releases.")> _
Public Shared Sub WriteByte ( _
	ptr As Object, _
	ofs As Integer, _
	val As Byte _
)

Parameters

ptr
Type: System.Object

The base address in unmanaged memory of the target object.

ofs
Type: System.Int32

An additional byte offset, which is added to the ptr parameter before writing.

val
Type: System.Byte

The value to write.

ExceptionCondition
AccessViolationException

Base address (ptr) plus offset byte (ofs) produces a null or invalid address.

ArgumentException

ptr is an ArrayWithOffset object. This method does not accept ArrayWithOffset parameters.

WriteByte enables direct interaction with an unmanaged C-style byte array, eliminating the expense of copying an entire unmanaged array (using Marshal.Copy) to a separate managed array before setting its element values.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
Obsolete (compiler warning) in 4.6

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Obsolete (compiler warning) in Windows Phone 8.1

  • SecurityCriticalAttribute 

    requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

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