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  • namespace Harmony2015

    { public partial class BuildModel : Form { public BuildModel() { InitializeComponent(); } public class ImpedanceEl { public ImpedanceEl() { } public int Id { get; set; } public int Length { get; set; } public double Re_X { get; set; } // I am not sure what type of value impedance has } public class Power_Sys { public Power_Sys() { } public string Power_Sys_ID { get; set; } public ICollection<ImpedanceEl> ImpedanceEl { get; set; } } } namespace Power_System_Simulation_Harmonics { public class SystemContext : System.Data.Entity.DbContext { public SystemContext() : base() { } //PROBLEM OCCURS IN THE NEXT TWO LINES. public DbSet<ImpedanceEl> ImpedanceElements { get; set; } public DbSet<Power_Sys> PowerSystems { get; set; } } }

    I'm having some trouble with the code above.

    I'm working through the database tutorial at:


    It appears that I am missing a "class" definition,

    but I have defined the two classes above the code that has the problem.

    This seems a little mysterious.

    Can anyone help (please).

    Thank you.

    Thursday, September 17, 2015 3:00 PM


  • Hi LingJingLing,

    I guess you are getting this error message "The type or namespace name 'ImpedanceEl' could not be found (are you missing a using directive or an assembly reference?)". It was caused by the different namespace you are using in your project.

    Change "namespace Power_System_Simulation_Harmonics" to "namespace Harmony2015" can solve this problem. Please try it and let me know the result.


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    Friday, September 18, 2015 3:23 AM