Entity framework 基于Web API的带Autofac的EF依赖项注入

在DbContext中保存实体时，我有一个动态注入的内务管理服务

protected override DbEntityValidationResult ValidateEntity(DbEntityEntry entityEntry, IDictionary<object, object> items)
{
    var t = entityEntry.Entity.GetType();

    // Housekeep
    var castEntityEntry = castDbEntityEntryMethod
        .MakeGenericMethod(new[] { t })
        .Invoke(entityEntry, null);
    housekeepEntityMethod
        .MakeGenericMethod(new[] { t })
        .Invoke(this, new[] { castEntityEntry });

    return base.ValidateEntity(entityEntry, items);
}

private void HousekeepEntity<TEntity>(DbEntityEntry<TEntity> entity)
    where TEntity : class
{
    var housekeeper = DbConfiguration.DependencyResolver.GetService<IHousekeeper<TEntity>>();
    if (housekeeper != null)
    {
        housekeeper.Maintain(entity);
    }
}

设置容器时：

System.Data.Entity.DbConfiguration.Loaded += (s, e) =>
    e.AddDependencyResolver(new AutofacDbDependencyResolver(container), overrideConfigFile: false);

但是，我的生存范围返回null。如何获取调用此操作的当前API请求？

禁止在DbContext中使用。EF6现在是否允许您解决它并不重要，它仍然是一种反模式。相反，只需使用依赖项注入或通过挂接到事件来添加此内务管理。例如，可以为实体编写分部类：

public partial class MyEntities
{
    public event Action<DbContext> SavingChanges = _ => { };

    public override int SaveChanges()
    {
        this.SavingChanges(this);

        return base.SaveChanges();
    }
}

---

@蒂姆：是的，

DbContext

是工作单元模式的实现。

public partial class MyEntities
{
    public event Action<DbContext> SavingChanges = _ => { };

    public override int SaveChanges()
    {
        this.SavingChanges(this);

        return base.SaveChanges();
    }
}

builder.Register<MyEntities>(context =>
{
    var db = new MyEntities();
    db.SavingChanges += context.Resolve<IHouseKeepingService>().HousekeepEntities;
    return db;
}).InstancePerLifetimeScope();