使用通用存储库实现简单注入器 [英] Implement Simple Injector with generic repository

问题描述

我有一个接口 IRepository< T>其中T：class 和一个抽象类抽象类Repository< C，T> ：IRepository< T>其中T：class用于实现接口的C：DbContext 。最后，我有我的实体存储库，它继承了抽象类。下面是一个混合的例子：

  public interface IRepository< T>其中T：class 
 {
 IQueryable< T>得到所有（）; 
 IQueryable< T> FindBy（Expression< Func< T，bool>>谓词）; 
 void Add（T entity）; 
无效删除（T实体）; 
} 
 
 
公共抽象类库< C，T> ：IRepository< T> 
 where T：class where C：DbContext，new（）
 {
 private C _context = new C（）; 
 public C Context 
 {
 get {return _context; } 
 set {_context = value; } 
} 
公共虚拟IQueryable< T> GetAll（）
 {
 IQueryable< T> query = _context.Set< T>（）; 
返回查询; 
} 
 ... 
} 
 
公共类PortalRepository：存储库< SequoiaEntities，Portal> 
 {
} 
  

在我的global.asax.cs文件中，Application_Start （）函数，我补充道：

  Container container = new Container（）; 
 container.Register< IRepository< Portal>，Repository< SequoiaEntities，Portal>>（）; 
 container.Verify（）; 
  

当我启动我的项目时，Simple Injector会尝试验证容器，并且出现错误： p>

其他信息：给定类型存储库< SequoiaEntities，Portal> 不是具体类型。请使用其他重载注册此类型。

有没有一种方法可以用泛型类实现Simple Injector，或者我必须通过特定的类？

解决方案

注册< TService，TImpementation>（）方法允许你指定一个具体类型（ TImplementation ），当指定的服务（ TService Repository< SequoiaEntities，Portal> 被标记为 abstract 。这不允许Simple Injector创建它;抽象类无法创建。 CLR不允许这样做。

然而，您确实有一个具体的类型 PortalRepository ，我相信这是您的返回该类型的目标。因此，您的配置应如下所示：

  container.Register< IRepository< Portal> ;, PortalRepository>（）; 
  

或者，您可以使用Simple Injector的批量注册功能并将所有存储库注册到一个调用中：

  Assembly [] assemblies = new [] {typeof（PortalRepository）.Assembly}; 
 
 container.Register（typeof（IRepository<>），assemblies）; 
  

I have some problem to implement SimpleInjector with my generic Repository.

I have an interface IRepository<T> where T : class and an abstract class abstract class Repository<C, T> : IRepository<T> where T : class where C : DbContext which implements the interface. Finally I have my entity repositories which inherit the abstract class. Here's a concret example:

public interface IRepository<T> where T : class
{
    IQueryable<T> GetAll();
    IQueryable<T> FindBy(Expression<Func<T, bool>> predicate);
    void Add(T entity);
    void Remove(T entity);
}


public abstract class Repository<C, T> : IRepository<T> 
    where T : class where C : DbContext, new()
{
    private C _context = new C();
    public C Context
    {
        get { return _context; }
        set { _context = value; }
    }
    public virtual IQueryable<T> GetAll()
    {
        IQueryable<T> query = _context.Set<T>();
        return query;
    }
    ...
}

public class PortalRepository : Repository<SequoiaEntities, Portal>
{
}

In my global.asax.cs file, under Application_Start() function, I added :

Container container = new Container();
container.Register<IRepository<Portal>, Repository<SequoiaEntities, Portal>>();
container.Verify();

When I launch my project, Simple Injector tries to verify the container and I get an error :

Additional information: The given type Repository<SequoiaEntities, Portal> is not a concrete type. Please use one of the other overloads to register this type.

Is there a way to implement Simple Injector with generic class or I have to pass by specific class?

解决方案

The Register<TService, TImpementation>() method allows you to specify a concrete type (TImplementation) that will be created by Simple Injector when the specified service (TService) is requested. The specified implementation Repository<SequoiaEntities, Portal> however is marked as abstract. This disallows Simple Injector from creating it; abstract classes can not be created. The CLR does not permit this.

You do have a concrete type PortalRepository however, and I believe it is your goal to return that type. Your configuration should therefore look as follows:

container.Register<IRepository<Portal>, PortalRepository>();

Alternatively, you can make use of Simple Injector's batch-registration facilities and register all your repositories in one call:

Assembly[] assemblies = new[] { typeof(PortalRepository).Assembly };

container.Register(typeof(IRepository<>), assemblies);

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