Maintainng custom code in the entity context.cs automatically created code

Question

I've searched but I guess I'm not exactly sure what to search on for this...

I am writing a data access layer for my application using the entity framework. I am performing a database first method so the entity data model is auto-generated.

So the model.context.cs file under the model.edmx contains this:

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated from a template.
//
//     Manual changes to this file may cause unexpected behavior in your application.
//     Manual changes to this file will be overwritten if the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

namespace com.MyCompany.AppPro.DAL 
{
    using System;
    using System.Data.Entity;
    using System.Data.Entity.Infrastructure;

    public partial class AppProEntities : DbContext
    {
        public AppProEntities()
            : base("name=AppProEntities")
        {
        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            throw new UnintentionalCodeFirstException();
        }

        public virtual DbSet<UserData> UserData { get; set; }
        public virtual DbSet<UserKey> UserKey { get; set; }
    }
}

I need to update this code to accept a connection string outside of this class. But when I update the model this file gets overwritten (which I'm warned about) in the comments. I can keep putting the code back in each time I update but there has to be a better way...

Is there any way I can add additional code into this file and have it retained on a DB schema update?

Mauricio Atanache · Accepted Answer · 2019-12-06 01:12:17Z

1

You need to define the same partial class inside the same namespace with your custom code in a separate file, this is the whole point in using a partial class.

answered Dec 6, 2019 at 1:12

Mauricio Atanache

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2 Comments

Gratzy Over a year ago

thanks, sometimes you can't see the trees through the forest.

Mauricio Atanache Over a year ago

@DaBlue please consider flagging my reply as an answer instead of an upvote, thanks.

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