MySqlEFConfiguration與MySql.Data.Entity.EF6.DLL
下列程式碼中，當MySqlEFConfiguration出現波浪線，則必須針對MySql.Data.Entity.EF6.DLL加入參考。
public class MyContext : DbContext
延伸閱讀：
[1]Code-Based Configuration (EF6 onwards)
https://msdn.microsoft.com/en-us/data/jj680699.aspx
[2]Config File Settings
https://msdn.microsoft.com/en-us/data/jj556606
