原文：https://www.cnblogs.com/sdusrz/p/4433108.html原文：https://www.cnblogs.com/sdusrz/p/4433108.htm
阅读背景：
多线程下，多次操作数据库报错，There is already an open DataReader associated with this Command which must be closed first.
来源：互联网
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