如何用结构图扫描另一个库

Question

我有一个名为 ServiceLayer 的 class 库，其中包含以下代码：

IProductService.cs

public interface IProductService
{
    void AddNewProduct(Product product);
    IList<Product> GetAllProducts();
}

ProductService.cs

public class ProductService : IProductService
{
    readonly IDbSet<Product> _products;

    public ProductService(IUnitOfWork uow)
    {
        _products = uow.Set<Product>();
    }

    public void AddNewProduct(Product product)
    {
        _products.Add(product);
    }

    public IList<Product> GetAllProducts()
    {
        return _products.Include(x => x.Category).ToList();
    }
}

我安装了 Structuremap.MVC5，所以在 DefaultRegistry 文件中我有以下代码：

DefaultRegistry.cs

 public DefaultRegistry()
    {
        Scan(
            scan =>
            {
                scan.TheCallingAssembly();
                scan.WithDefaultConventions();
                scan.With(new ControllerConvention());
            });

        For<IUnitOfWork>().HybridHttpOrThreadLocalScoped().Use(() => new ApplicationDbContext());
    }

但是结构图不起作用，给我这个异常：

An exception of type 'StructureMap.StructureMapConfigurationException' occurred in StructureMap.dll but was not handled in user code

附加信息：没有注册默认实例，无法自动确定类型 'MEF.ServiceLayer.IProductService'

所以我的问题是，结构图如何扫描主项目以外的另一个 class 库？

Answer 1

您应该尝试添加包含 IProductService 的程序集。例如

Scan(
   scan =>
      {
         scan.TheCallingAssembly();
         scan.WithDefaultConventions();
         // Add the assembly that contains a certain type
         scan.AssemblyContainingType<IProductService>();
         scan.With(new ControllerConvention());
      }
    );

如果上述方法不起作用，可能是 ProductServce 中缺少默认构造函数。尝试添加以下内容：

public class ProductService : IProductService
{
   readonly IDbSet<Product> _products;
   [DefaultConstructor]
   public AccountController()
   {

   }

   ...
}     

Answer 2

如果您引用了包含IProductService的项目，您可以使用Assembly方法并传递项目名称：

Scan(scan =>
     {
                // YourProject.Service: The project that contains IProductService
                scan.Assembly("YourProject.Service");
                scan.TheCallingAssembly();
                scan.WithDefaultConventions();
     });