錯誤描述：
調用EF中的FirstOrDefault()時，報錯誤：An error occurred while executing the command definition. See the inner exception for details.
解決方案：
一般是代碼中的表或者字段無法與數據庫對應導致，檢查代碼中的表名稱或字段名稱與數據庫表或字段名稱是否一致。
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