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OpCodes.Dup Field

.NET Framework 2.0

Copies the current topmost value on the evaluation stack, and then pushes the copy onto the evaluation stack.

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

C#
C++
VB
Copy 
public static readonly OpCode Dup
J#
Copy 
public static final OpCode Dup
JScript
Copy 
public static final var Dup : 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

25

dup

Duplicates the value on the top of the stack.

The stack transitional behavior, in sequential order, is:

  1. value is pushed onto the stack.

  2. value is popped off of the stack for duplication.

  3. value is pushed back onto the stack.

  4. A duplicate value is pushed onto the stack.

The dup instruction duplicates the top element of the stack, and leaves two identical values atop it.

The following Emit method overload can use the dup opcode:

  • ILGenerator.Emit(OpCode)

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0
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