如果EFcore報錯efcore This MySqlConnection is already in use，的話說明EFcore還在連線資料庫，沒有斷開，然後你又再次連線到資料庫。
注意觀察，把資料庫連線執行關閉操作就行了，例如Tolist（）這樣的操作
efcore This MySqlConnection is already in use
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