Message in Chinese (Simplified) (中文(简体))
方法 'Single' 和 'SingleOrDefault' 只能用作最终查询操作。请考虑在此实例中改用方法 'FirstOrDefault'。
Unlocalized message
The methods 'Single' and 'SingleOrDefault' can only be used as a final query operation. Consider using the method 'FirstOrDefault' in this instance instead.
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