asp.net-mvc – 如何将Ninject与HttpClient一起使用

2023年2月11日 150次阅读

使用Ninject将相同的HttpClient对象注入应用程序中的所有Controller实例的推荐方法是什么？

目前,我正按照Adam Freeman的MVC书籍注入EntityFramework数据库上下文,如下所示.但是,这会为每个控制器实例创建一个新的dbContext,这可能不适合HttpClient,因为HttpClient意味着可以在MVC应用程序中的所有控制器上重用.

构造函数：

public class AccountController : Controller
{
  MyDBContext dbContext = new MyDBContext();

  public AccountController(MyDBContext context)
  {
    dbContext = context;
  }

  ...
}

Ninject Factory如下：

/// Class based on Adam Freeman's MVC book to use dependency injection to create controllers
public class NinjectControllerFactory : DefaultControllerFactory
{
  private IKernel ninjectKernel;

  public NinjectControllerFactory()
  {
    ninjectKernel = new StandardKernel();
    AddBindings();
  }

  protected override IController GetControllerInstance(RequestContext requestContext, Type controllerType)
  {
    return controllerType == null
      ? null
      : (IController)ninjectKernel.Get(controllerType);
  }

  private void AddBindings()
  {
    ninjectKernel.Bind<MyDBContext>().ToSelf().InTransientScope();        
  }
}

最佳答案 谢谢史蒂文.目前,我发现以下工作.我在NinjectController中创建了一个静态HttpClient属性,并在单例范围内将其绑定为常量.
Daniel’s book有助于更好地理解Ninject.

/// Class based on Adam Freeman's MVC book to use dependency injection to create controllers
public class NinjectControllerFactory : DefaultControllerFactory
{
  private IKernel ninjectKernel;
  private static HttpClient WebAPIClient; // added

  public NinjectControllerFactory()
  {
    ninjectKernel = new StandardKernel();

    WebAPIClient = new HttpClient();  // added
    WebAPIClient.BaseAddress = new Uri("http://localhost:1153");  // added 

    AddBindings();
  }

  protected override IController GetControllerInstance(RequestContext requestContext, Type controllerType)
  {
    return controllerType == null
      ? null
      : (IController)ninjectKernel.Get(controllerType);
  }

  private void AddBindings()
  {
    ninjectKernel.Bind<MyDBContext>().ToSelf().InTransientScope();
    ninjectKernel.Bind<HttpClient>().ToConstant(WebAPIClient).InSingletonScope();  // added
  }
}
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