Assembly: mscorlib (in mscorlib.dll)
The following table lists the instruction's hexadecimal and Microsoft Intermediate Language (MSIL) assembly format, along with a brief reference summary:
39 < int32 >
Branches to a target instruction at the specified offset if false.
The stack transitional behavior, in sequential order, is:
value is pushed onto the stack by a previous operation.
value is popped from the stack; if value is false, branch to target.
The brfalse 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 *, natural int) is zero (false). If value is non-zero (true) execution continues at the next instruction.
The target instruction is represented as a 4-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 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.