OpCodes.Dup Field


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)

static val Dup : OpCode

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


Assembly Format




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)

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.1
Windows Phone
Available since 8.1
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