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ID=exchange.Buy(Price, Amount)
想要获取返回的ID，因为网络延迟或其他原因未返回ID，ID就为NULL，导致接下来的代码无法继续执行下去。
如果用_C函数，会不会导致一直重复买单？
该怎样处理，直到它返回了ID再继续往下执行？
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