Question

I ve modified the bytecode of an assembly to get rid off of an error and now when I try to use it I get a InvalidProgramException. All I ve done is replace this code with NOPS:

catch (Exception exception1)
{
    Exception exception = exception1;
    if (exception as InvalidValueException == null)
    {
        throw new InvalidGenerationException(2);
    }
    else
    {
        throw exception;
    }
}

之前的 IL :

catch [mscorlib]System.Exception
{
    IL_022f: stloc.s exception
    IL_0231: ldloc.s exception
    IL_0233: isinst Custom.InvalidValueException
    IL_0238: brfalse.s IL_023d

    IL_023a: ldloc.s exception
    IL_023c: throw

    IL_023d: ldc.i4.1
    IL_023e: newobj instance void Custom.InvalidGenerationException ...
    IL_0243: throw
}

依次( IL ) :

catch [mscorlib]System.Exception
{
    IL_022f: nop
    IL_0230: nop
    IL_0231: nop
    IL_0232: nop
    IL_0233: nop
    IL_0234: nop
    IL_0235: nop
    IL_0236: nop
    IL_0237: nop
    IL_0238: nop
    IL_0239: nop
    IL_023a: nop
    IL_023b: nop
    IL_023c: nop
    IL_023d: nop
    IL_023e: nop
    IL_023f: nop
    IL_0240: nop
    IL_0241: nop
    IL_0242: nop
    IL_0243: nop
}

有什么想法为什么这是错的?

谢谢!

Answer 1

您原来的 captain captain block 总是会抛出。也就是说, 无法“ 正常地” 退出区块。

您修改过的 capt block 并不丢弃, 所以您需要正常退出该区块。您需要使用 < a href=" http:// msdn. microsoft. com/ en- us/ library/ system. reflection. emit. opcodes. leave" {code> leave 或 < a href=> http://msdn. microsoftr. com/ en- us/library/ system. reflection. emit. opcodes. left_ s" {code> lift.s 。

(你也许还需要 < a href=>" http://msdn.microsoft.com/en-us/library/system.reflection.emit.opcodes.pop"\ code>pop 将特例从堆叠中解开以保持整洁。虽然我不确定, 你还是得自己试试看。 )

catch [mscorlib]System.Exception
{
    IL_022f: pop                // not certain if pop is necessary
    IL_0230: leave.s IL_0244
    IL_0232: nop
    IL_0233: nop
    IL_0234: nop
    IL_0235: nop
    IL_0236: nop
    IL_0237: nop
    IL_0238: nop
    IL_0239: nop
    IL_023a: nop
    IL_023b: nop
    IL_023c: nop
    IL_023d: nop
    IL_023e: nop
    IL_023f: nop
    IL_0240: nop
    IL_0241: nop
    IL_0242: nop
    IL_0243: nop
}
IL_0244: ret    // or whatever

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