将Entity Framework 4.0迁移到核心 [英] Migrate Entity Framework 4.0 to Core

问题描述

我有一个使用Entity Framwork 4.0开发的旧项目，该项目使用了一些复杂的类型.由于需要将其迁移到.NET Core，因此我创建了一个新项目，安装了所有必需的库并使用了命令

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

在现有数据库上

以便创建新模型.问题在于它不会生成复杂的类型类.

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

我可以想象用人工创建的复杂类型替换生成的属性，使用 [ComplexType] 属性，并使用 OwnsOne 命令设置属性，但是如果有一种自动生成选项，就会徘徊.

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.

有没有办法做到这一点?

Is there a way to do this?

推荐答案

我创建了第二个局部类，以便将自定义内容添加到所创建的局部类中.还添加了部分OnModelCreatingPartial方法，在其中定义了我的复杂类型.

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.

以下是代码段:

[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");
        });
    }
}

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