在EF Core中應用所有IEntityTypeConfiguration派生類

Question

有沒有人知道一種方法或有一個實現在運行時將所有從IEntityTypeConfiguration<>派生的類應用到DbContext ？

似乎沒有內置任何東西並通過以下方式手動加載每個：

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.ApplyConfiguration(new Table1Config())
    modelBuilder.ApplyConfiguration(new Table2Config())
    ...
    modelBuilder.ApplyConfiguration(new TableNConfig())
}

對於具有許多表的數據庫來說，這將變得相當繁瑣。

Answer 1

對於EF Core <= 2.1

您可以編寫擴展方法，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中如下：

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

   modelBuilder.ApplyAllConfigurations();
}

對於EF Core> = 2.2

從EF Core 2.2您不需要編寫任何自定義擴展方法。 ApplyConfigurationsFromAssembly EF Core 2.2添加了ApplyConfigurationsFromAssembly擴展方法。 您可以按如下方式使用它：

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

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

謝謝。

Answer 2

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    var implementedConfigTypes = Assembly.GetExecutingAssembly()
        .GetTypes()
        .Where(t => !t.IsAbstract
            && !t.IsGenericTypeDefinition
            && t.GetTypeInfo().ImplementedInterfaces.Any(i =>
                i.GetTypeInfo().IsGenericType && i.GetGenericTypeDefinition() == typeof(IEntityTypeConfiguration<>)));

    foreach (var configType in implementedConfigTypes)
    {
        dynamic config = Activator.CreateInstance(configType);
        modelBuilder.ApplyConfiguration(config);
    }
}

Answer 3

現在內置於EF Core 2.2中：

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.ApplyConfigurationsFromAssembly(typeof(PersonConfiguration).Assembly);
}