在使用EF进行更新数据时出错，报出的异常是
“An error occurred while updating the entries. See the inner exception for details”
最开始一直不知道在哪里，可以看到这个“inner exception”，最后才发现，在异常弹出窗的下面，有一个查看详情。可以在这个页面里面看到具体的错误信息。如下：
找到了具体的错误信息，这个错误就很容易解决了。
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An error occurred while updating the entries. See the inner exception for details.
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