Ninject:构造函数参数

Question

我正在使用Ninject和ASP.NET MVC 4.我正在使用存储库并希望进行构造函数注入以将存储库传递给其中一个控制器.

这是我的Repository接口:

public interface IRepository<T> where T : TableServiceEntity
{
    void Add(T item);
    void Delete(T item);
    void Update(T item);
    IEnumerable<T> Find(params Specification<T>[] specifications);
    IEnumerable<T> RetrieveAll();
    void SaveChanges();
}

在AzureTableStorageRepository下面是一个实现IRepository<T>:

public class AzureTableRepository<T> : IRepository<T> where T : TableServiceEntity
{
    private readonly string _tableName;
    private readonly TableServiceContext _dataContext;

    private CloudStorageAccount _storageAccount;
    private CloudTableClient _tableClient;

    public AzureTableRepository(string tableName)
    {
        // Create an instance of a Windows Azure Storage account
        _storageAccount = CloudStorageAccount.Parse(ConfigurationManager.ConnectionStrings["StorageConnectionString"].ConnectionString);

        _tableClient = _storageAccount.CreateCloudTableClient();
        _tableClient.CreateTableIfNotExist(tableName);
        _dataContext = _tableClient.GetDataServiceContext();
        _tableName = tableName;
    }

请注意所需的tableName参数,因为我使用通用表存储库将数据持久保存到Azure.

最后我有以下控制器.

public class CategoriesController : ApiController
{
    static IRepository<Category> _repository;

    public CategoriesController(IRepository<Category> repository)
    {
        if (repository == null)
        {
            throw new ArgumentNullException("repository");
        }

        _repository = repository;
    }

现在我想将一个存储库注入控制器.所以我创建了一个包含绑定的模块:

/// <summary>
/// Ninject module to handle dependency injection of repositories
/// </summary>
public class RepositoryNinjectModule : NinjectModule
{
    public override void Load()
    {
        Bind<IRepository<Category>>().To<AzureTableRepository<Category>>();
    }
}

模块的加载是在 NinjectWebCommon.cs

/// <summary>
    /// Creates the kernel that will manage your application.
    /// </summary>
    /// <returns>The created kernel.</returns>
    private static IKernel CreateKernel()
    {
        var kernel = new StandardKernel();
        kernel.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel);
        kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>();

        RegisterServices(kernel);
        return kernel;
    }

    /// <summary>
    /// Load your modules or register your services here!
    /// </summary>
    /// <param name="kernel">The kernel.</param>
    private static void RegisterServices(IKernel kernel)
    {
        // Load the module that contains the binding
        kernel.Load(new RepositoryNinjectModule());

        // Set resolver needed to use Ninject with MVC4 Web API
        GlobalConfiguration.Configuration.DependencyResolver = new NinjectResolver(kernel);
    } 

这DependencyResolver是因为Ninject的DependencyResolver实现System.Web.Mvc.IDependencyResolver而创建的,并且无法将其分配给GlobalConfiguration.ConfigurationWebApi应用程序.

所有这一切,Ninject部分实际上是在Controller中注入正确的类型,但Ninject不能在构造函数中注入tableName参数AzureTableRepository.

在这种情况下我怎么能这样做？我已经查阅了很多文章和ninject文档,看看我如何使用参数,但我似乎无法让它工作.

任何帮助,将不胜感激.

Answer 1

我会使用WithConstructorArgument()像...这样的方法

Bind<IRepository<Category>>().To<AzureTableRepository<Category>>()
    .WithConstructorArgument("tableName", "categories");

存储库设计的其余部分可能是另一个问题.恕我直言创建一张桌子或在ctor中做任何繁重的工作似乎是一件很难的事.