This documentation is archived and is not being maintained.

OpCodes.Initblk Field

Initializes a specified block of memory at a specific address to a given size and initial value.

[Visual Basic]
Public Shared ReadOnly Initblk As OpCode
public static readonly OpCode Initblk;
public: static OpCode Initblk;
public static var Initblk : OpCode;


The following table lists the instruction's hexadecimal and Microsoft Intermediate Language (MSIL) assembly format, along with a brief reference summary:

Format Assembly Format Description
FE 18 initblk Set each location in a block of memory to a given value.

The stack transitional behavior, in sequential order, is:

  1. A starting address is pushed onto the stack.
  2. An initialization value is pushed onto the stack.
  3. The number of bytes to initialize is pushed onto the stack.
  4. The number of bytes, the initialization value, and the starting address are popped from the stack, and the initialization is performed as per their values.

The initblk instruction sets the number (unsigned int32) of bytes starting at the specified address (of type natural int, &, or *) to the initialization value (of type unsigned int8). initblk assumes that the starting address is aligned to the natural size of the machine.

The operation of the initblk instructions can be altered by an immediately preceding Volatile or Unaligned prefix instruction.

NullReferenceException may be thrown if an invalid address is detected.

The following Emit constructor overload can use the initblk opcode:

  • ILGenerator.Emit(OpCode)


Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

OpCodes Class | OpCodes Members | System.Reflection.Emit Namespace