OpCodes.Brfalse Field
Transfers control to a target instruction if value is false, a null reference (Nothing in Visual Basic), or zero.
Namespace: System.Reflection.Emit
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:
Format | Assembly Format | Description |
|---|---|---|
39 < int32 > | brfalse target brnull target brzero target | 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 *, native 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.
If the target instruction has one or more prefix codes, control can only be transferred to the first of these prefixes. 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:
ILGenerator.Emit(OpCode, Label)
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
