结构图 - 具有依赖关系的安装依赖关系
问题描述:
我使用结构图作为我的IOC与Web API,我有一个注入的依赖项在我的控制器中,它的具体类型也有一个依赖关系。结构图 - 具有依赖关系的安装依赖关系
控制器
[RoutePrefix("api/products")]
public class ProductsController : BaseApiController
{
//private readonly ProductRepository _manageProducts;
private readonly IProductFactory _productFactory;
private readonly IGenericRepository _genericRepository;
public ProductsController(IProductFactory productFactory, IGenericRepository genericRepository)
{
_productFactory = productFactory;
_genericRepository = genericRepository;
//_manageProducts = new ProductRepository();
}
[Authorize]
[Route("addProduct")]
public IHttpActionResult AddNewProduct(ProductViewModels.AddProductViewModel product)
{
if (User.IsInRole("Admin"))
{
_productFactory.CreateProduct(product);
return Ok("Product Successfully Added");
}
return BadRequest("Your must have Administrator rights to perform the operation.");
}
}
厂
public class ProductFactory : IProductFactory
{
private readonly IGenericRepository _genericRepository;
public ProductFactory(IGenericRepository genericRepository)
{
_genericRepository = genericRepository;
}
/// <summary>
/// Creates the product.
/// </summary>
/// <returns>The product.</returns>
/// <param name="viewModel">New product.</param>
public Product CreateProduct(ProductViewModels.AddProductViewModel viewModel)
{
var productToBeAdded = new Product
{
Title = viewModel.Title,
ISBN = viewModel.ISBN,
};
return productToBeAdded;
}
}
当我打电话产品控制器addproducts我得到空引用异常此运行时错误:
{
"Message": "An error has occurred.",
"ExceptionMessage": "Object reference not set to an instance of an object.",
"ExceptionType": "System.NullReferenceException",
"StackTrace": " at ICEBookshop.API.Factories.ProductFactory.CreateProduct(AddProductViewModel viewModel) in C:\\Users\\GOWDY_N\\Source\\Repos\\ICEBookshop.API\\ICEBookshop.API\\P00603ClientApi\\Factories\\ProductFactory.cs:line 29\r\n at ICEBookshop.API.Controllers.ProductsController.AddNewProduct(AddProductViewModel product) in C:\\Users\\GOWDY_N\\Source\\Repos\\ICEBookshop.API\\ICEBookshop.API\\P00603ClientApi\\Controllers\\ProductsController.cs:line 95\r\n at lambda_method(Closure , Object , Object[])\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()"
}
这是我和structuremap
public class DefaultRegistry : Registry
{
#region Constructors and Destructors
public DefaultRegistry()
{
Scan(
scan =>
{
scan.TheCallingAssembly();
scan.WithDefaultConventions();
});
For<IGenericRepository>().Use<GenericRepository<ApplicationDbContext>>();
For<IProductFactory>()
.Use<ProductFactory>()
.Ctor<IGenericRepository>()
.Is<GenericRepository<ApplicationDbContext>>().Named("DefaultInstanceKey");
#endregion
}
}
做我是这么认为的它知道如何解决我的工厂,这将解决这个问题:
For<IProductFactory>()
.Use<ProductFactory>()
.Ctor<IGenericRepository>()
.Is<GenericRepository<ApplicationDbContext>>().Named("DefaultInstanceKey");
但它不工作也没有。有谁知道如何解决这一问题?
答
只需注册两个接口及其实现。该框架将在解析目标时解决依赖关系。
For<IGenericRepository>().Use<GenericRepository<ApplicationDbContext>>();
For<IProductFactory>().Use<ProductFactory>();