如何在完成请求后立即处理Unity DI创建的对象？

Question

我想知道是否有更好的方法来处理这个问题。

我已经为我们的项目设置了 Unity 依赖注入。该项目本身是一个使用 Web API.

的 ASP.NET 应用程序

我安装了以下软件包。

团结
Unity.ASPNet.WebAPI

我看不到在获取数据后 close/dispose DBContext 的选项。

我的控制器

public class NinjasController : ApiController
{
    public Ninja Get(int id)
    {
        INinjaRepository repository = UnityConfig.Container.Resolve(typeof(INinjaRepository), null) as INinjaRepository;
        Ninja ninja = repository.GetNinjaById(id);
        repository.CanBeDisposed = true;
        repository = null;
        UnityConfig.PerRequestLifetimeManager.Dispose();
        return ninja;
    }
}

UnityConfig

public static class UnityConfig
{
    private static Lazy<IUnityContainer> container =
      new Lazy<IUnityContainer>(() =>
      {
          var container = new UnityContainer();
          RegisterTypes(container);
          return container;
      });

    public static IUnityContainer Container => container.Value;
    public static PerRequestLifetimeManager PerRequestLifetimeManager;

    public static void RegisterTypes(IUnityContainer container)
    {
        PerRequestLifetimeManager = new PerRequestLifetimeManager();
        container.RegisterType<INinjaRepository, NinjaRepository>(PerRequestLifetimeManager);
    }
}

终身经理

public class PerRequestLifetimeManager : TransientLifetimeManager, IDisposable
{
    private static List<IBaseRepository> list = new List<IBaseRepository>();

    public override void SetValue(object newValue, ILifetimeContainer container = null)
    {
        base.SetValue(newValue, container);

        IBaseRepository disposable = newValue as IBaseRepository;
        if (disposable != null)
            list.Add(disposable);
    }

    public void Dispose()
    {
        foreach (IBaseRepository item in list.FindAll(item => item.CanBeDisposed))
        {
            if (item != null)
            {
                try
                {
                    item.Dispose();
                }
                catch (Exception)
                {
                    // log exception and continue
                }
            }
        }

        list.RemoveAll(item => item.CanBeDisposed);
    }
}

存储库

public class GenericRepository<TEntity> : IGenericRepository<TEntity> where TEntity : class
{
    internal DbContext _context;
    internal DbSet<TEntity> _dbSet;
    public bool CanBeDisposed { get; set; }

    public GenericRepository(DbContext context)
    {
        _context = context;
        _dbSet = context.Set<TEntity>();
    }

    protected void Dispose(bool disposing)
    {
        if (disposing)
        {
            if (_context != null)
            {
                _context.Dispose();
                _context = null;
            }
        }
    }

    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }
}

Answer 1

首先，您可能想在项目中再添加一个 Unity 引导程序 Unity.AspNet.Mvc

https://msdn.microsoft.com/en-us/library/dn507440(v=pandp.30).aspx

To use the PerRequestLifetimeManager class in an ASP.NET Web API application, you must also add the the Unity bootstrapper for ASP.NET MVC NuGet package to your project.

Unity.Mvc 和 Unity.AspNet.WebApi 将为您的控制器注册 DI。

UnityConfig.cs

public static void RegisterTypes(IUnityContainer container)
{
    container.RegisterType<INinjaContext, NinjaContext>(new PerRequestLifetimeManager());
    container.RegisterType<INinjaRepository, NinjaRepository>(new PerRequestLifetimeManager());
}

UnityWebApiActivator.cs 取消注释行...

public static void Start()
{
    // Use UnityHierarchicalDependencyResolver if you want to use
    // a new child container for each IHttpController resolution.
    var resolver = new UnityHierarchicalDependencyResolver(UnityConfig.Container);

    ...
}

UnityMvcActivator.cs 取消注释行...

public static void Start()
{
    ...

    // TODO: Uncomment if you want to use PerRequestLifetimeManager
    Microsoft.Web.Infrastructure.DynamicModuleHelper.DynamicModuleUtility.RegisterModule(typeof(UnityPerRequestHttpModule));
}

你的控制器就是

public class NinjasController : ApiController
{
    private readonly INinjaRepository repository;

    public NinjasController(INinjaRepository repository)
    {
        this.repository = repository;
    }

    public Ninja Get(int id)
    {
        var ninja = repository.GetNinjaById(id);
        return ninja;
    }
}

使用 PerRequestLifetimeManager Unity 将在请求完成后处理。

我这里有个例子https://github.com/jasenhk/MovieStar

如果您使用的是 OWIN，请参阅

如何在完成请求后立即处理Unity DI创建的对象？

How to dispose the object created by Unity DI right after the completing the request?

c#

asp.net

entity-framework

unity-container

asp.net-web-api