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Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.
调用后台API提示500错误，接口返回信息如下。
原因是：
Dictionary被多个线程同时所修改导致的所措。
解决办法：
把程序的写法改了下。
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