代码之家 › 专栏 › 技术社区 › TanvirArjel

EF Core中的modelBuilder.Configurations.AddFromAssembly

ef-core-2.1 entity-framework-core asp.net-core c#

5

TanvirArjel · 技术社区 · 7 年前

EntityFramework 6.x ,如果我们有很多 EntityConfiguration OnModelCreating(ModelBuilder modelBuilder) 而不是一个接一个:

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
   base.OnModelCreating(modelBuilder);

   modelBuilder.Configurations.AddFromAssembly(typeof(MyDbContext).Assembly);
}

有什么像 modelBuilder.Configurations.AddFromAssembly 在里面

谢谢您。

1 回复 | 直到 7 年前

1

5

TanvirArjel 7 年前

对于EF Core<=2.1

您可以编写一个扩展方法,如下所示:

public static class ModelBuilderExtensions
{
    public static void ApplyAllConfigurations(this ModelBuilder modelBuilder)
    {
        var typesToRegister = Assembly.GetExecutingAssembly().GetTypes().Where(t => t.GetInterfaces()
            .Any(gi => gi.IsGenericType && gi.GetGenericTypeDefinition() == typeof(IEntityTypeConfiguration<>))).ToList();

        foreach (var type in typesToRegister)
        {
            dynamic configurationInstance = Activator.CreateInstance(type);
            modelBuilder.ApplyConfiguration(configurationInstance);
        }
    }
}

然后在 OnModelCreating

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
   base.OnModelCreating(modelBuilder);

   modelBuilder.ApplyAllConfigurations();
}

对于EF Core>=2.2

在EF Core 2.2中,您不需要编写任何自定义扩展方法。增加EF核心2.2 ApplyConfigurationsFromAssembly 为此目的的扩展方法。您可以如下使用它:

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
   base.OnModelCreating(modelBuilder);

   modelBuilder.ApplyConfigurationsFromAssembly(typeof(UserConfiguration).Assembly); // Here UseConfiguration is any IEntityTypeConfiguration
}

谢谢您。