Leave Field
Collapse the table of content
Expand the table of content

OpCodes.Leave Field

Exits a protected region of code, unconditionally transferring control to a specific target instruction.

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

public static readonly OpCode Leave

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


Assembly Format


DD < int32 >

leave target

Exits a protected region of code.

There is no stack transition behavior specified for this instruction.

The leave instruction unconditionally transfers control to the specific target instruction, represented as a 4-byte signed offset from the beginning of the instruction following the current instruction.

The leave instruction is similar to the br instruction, but it can be used to exit a try, filter, or catch block whereas the ordinary branch instructions can only be used in such a block to transfer control within it. The leave instruction empties the evaluation stack and ensures that the appropriate surrounding finally blocks are executed.

You cannot use a leave instruction to exit a finally block. To ease code generation for exception handlers it is valid from within a catch block to use a leave instruction to transfer control to any instruction within the associated try block.

If an instruction has one or more prefix codes, control can only be transferred to the first of these prefixes.

The following Emit method overloads can use the leave opcode:

  • ILGenerator.Emit(OpCode, Label)

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

Community Additions

© 2015 Microsoft