[DebuggerHidden]
        IEnumerator<string> IEnumerable<string>.GetEnumerator()
        {
            if (Interlocked.CompareExchange(ref this.$PC, 0, -2) == -2)
            {
                return this;
            }
            fuckleo.<ToString>c__Iterator0 iterator = new fuckleo.<ToString>c__Iterator0();
            iterator.source = this.<mce_markergt;source;
            return iterator;
        }

这个-2 是怎么回事,现在累了,记录一下回头解决