c# - 改进此工作单元类的方法，与开放/封闭原则和依赖注入(inject)/控制反转相关

Question

我有兴趣寻找可以改进以下 UnitOfWork 类的使用的方法。 正如您所看到的，它目前没有 UnitOfWork 接口(interface)，因此当我在 MVC Controller 中使用它时，我必须创建一个新对象，使我的 Controller 依赖于此类。

我希望能够使用 Ninject 通过将接口(interface)传递给 Controller ​​的构造函数来注入(inject)此依赖项，我的问题是此类目前不符合开放/关闭原则，我对任何人的建议感兴趣如何改进这一点。我想我还需要某种方式将存储库传递到这个工作单元中，但我不完全确定如何去做。

如有任何帮助，我们将不胜感激，谢谢。

/// <summary>
/// The unit of work maintains the list of repositories and coordinates changes using the EF CodeFirst data context.
/// This will remove concurrency issues with multiple repositories initialising new contexts within the same HTTP request scope.
/// Instead all transactions are done through the unit of work and that is used to call SaveChanges on the DbContext.
/// </summary>
public class ERSUnitOfWork : IDisposable
{
    private ERSDbContext context = new ERSDbContext();
    private GenericRepository<Recipe> recipeRepository;
    private GenericRepository<Member> memberRepository;
    private GenericRepository<Course> courseRepository;
    private GenericRepository<Cuisine> cuisineRepository;
    private GenericRepository<Review> reviewRepository;

    public GenericRepository<Recipe> RecipeRepository
    {
        get
        {
            if (this.recipeRepository == null)
            {
                this.recipeRepository = new GenericRepository<Recipe>(context);
            }
            return recipeRepository;
        }
    }

    public GenericRepository<Member> MemberRepository
    {
        get
        {
            if (this.memberRepository == null)
            {
                this.memberRepository = new GenericRepository<Member>(context);
            }
            return memberRepository;
        }
    }

    public GenericRepository<Course> CourseRepository
    {
        get
        {
            if (this.courseRepository == null)
            {
                this.courseRepository = new GenericRepository<Course>(context);
            }
            return courseRepository;
        }
    }

    public GenericRepository<Cuisine> CuisineRepository
    {
        get
        {

            if (this.cuisineRepository == null)
            {
                this.cuisineRepository = new GenericRepository<Cuisine>(context);
            }
            return cuisineRepository;
        }
    }

    public GenericRepository<Review> ReviewRepository
    {
        get
        {
            if (this.reviewRepository == null)
            {
                this.reviewRepository = new GenericRepository<Review>(context);
            }
            return reviewRepository;
        }
    }

    public void Save()
    {
        context.SaveChanges();
    }

    private bool disposed = false;

    /// <summary>
    /// Calls dispose on the DbContext, giving a disposing argument
    /// to distinguish from the public Dispose method that is required for the IDisposable interface
    /// </summary>
    protected virtual void Dispose(bool disposing)
    {
        if (!this.disposed)
        {
            if (disposing)
            {
                context.Dispose();
            }
        }
        this.disposed = true;
    }

    /// <summary>
    /// Calls the custom UnitOfWork Dispose() function instead and tells the garbage collector
    /// to suppress finalisation of the object, i.e. freeing up its resources
    /// </summary>
    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }
}

Answer 1

看来您不希望 UOW 类中存在存储库实例。我认为这篇文章解决了您的问题:Multiple generic repositories in unitofwork?