OpCodes.Brfalse_S Field

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Transfers control to a target instruction if value is false, a null reference, or zero.

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


Public Shared ReadOnly Brfalse_S As OpCode
public static readonly OpCode Brfalse_S


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


Assembly Format


2C < int8 >

brfalse.s target

brnull.s target

brzero.s target

Branches to a target instruction at the specified offset if false, short form.

The stack transitional behavior, in sequential order, is:

  1. value is pushed onto the stack by a previous operation.

  2. value is popped from the stack; if value is false, branch to target.

The brfalse.s instruction (and its aliases brnull and brzero) transfers control to the specified target instruction if value (of type int32, int64, object reference O, managed pointer &, transient pointer *, native int) is zero (false). If value is non-zero (true) execution continues at the next instruction.

The target instruction is represented as a 1-byte signed offset from the beginning of the instruction following the current instruction.

Control can only be transferred to the first of these prefixes if the target instruction has one or more prefix codes. Control transfers into and out of try, catch, filter, and finally blocks cannot be performed by this instruction.

The following Emit method overload can use the brfalse.s opcode:

  • ILGenerator.Emit(OpCode, Label)

Version Information

Windows Phone OS

Supported in: 8.1, 8.0, 7.1


Windows Phone

See Also


OpCodes Class

System.Reflection.Emit Namespace