Migrate Entity Framework 4.0 to Core

问题

I have an old project developed with the Entity Framwork 4.0 which uses some complex types. Since I need to migrate it to .NET Core, I created a new project, installed all required libraries and used the command

PM> Scaffold-DbContext "Server=ServerInstance; Database=DBName; Trusted_Connection=True;" 
             Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models

on the existing database in order to create the new models. The problem is that it does not generate the complex type classes.

I can imagine I could replace the generated properties with by hand created complex types, use the [ComplexType] attribute and set the property using OwnsOne command, but I was wandering if there is a sort of auto generation option.

Is there a way to do this?

回答1:

I created a second partial class in order to add custom stuff to the created one. Added also a partial OnModelCreatingPartial method in which I define my complex types.

Here a snippet:

[Owned]
public class MyComplexType
{
    public bool AField { get; set; }
    public string BField { get; set; }
}

public partial class MyMainEntity
{
    public MyComplexType MyComplexType { get; set; }
}

public partial class MyDbContext : DbContext
{
    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        if (!optionsBuilder.IsConfigured)
        {
            optionsBuilder.UseSqlServer("myConnectionString",
                opts => opts.CommandTimeout((int)TimeSpan.FromMinutes(10).TotalSeconds)
            );
        }
    }

    partial void OnModelCreatingPartial(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<MyMainEntity>().OwnsOne(e => e.MyComplexType, myComplexType =>
        {
            myComplexType.Property(p => p.AField).HasColumnName("ColumnNameFieldA");
            myComplexType.Property(p => p.BField).HasColumnName("ColumnNameFieldB");
        });
    }
}

来源：https://stackoverflow.com/questions/63463226/migrate-entity-framework-4-0-to-core

标签

entity-framework-core

entity-framework-migrations

complextype