本文介绍了依赖注入与ASP.NET的Web API的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我想在我的ASP.NET Web API控制器使用DI。显然有几个实现在那里。我只是想知道这些(城堡,Ninject,团结等等)这将是最容易配置/与ASP.NET的Web API结合保持?我得到这个错误:

If I add an empty constructor, then the constructor with IFilter is ignored.

This is my controller:

public class ImportJsonController : ApiController
{
    private readonly IFilter _filter;

    public ImportJsonController(IFilter filter)
    {
        _filter = filter;
    }

    public HttpResponseMessage Post([FromBody]dynamic value)
    {
        //do something
        return response;
    }
}
解决方案

You don't need a DI Container for this. Here's how to do it by hand:

public class PoorMansCompositionRoot : IHttpControllerActivator
{
    public IHttpController Create(
        HttpRequestMessage request,
        HttpControllerDescriptor controllerDescriptor,
        Type controllerType)
    {
        if (controllerType == typeof(ImportJsonController))
            return new ImportJsonController(new MyFilter());

        return null;
    }
}

You need to tell ASP.NET Web API about this class (e.g. in your Global.asax):

GlobalConfiguration.Configuration.Services.Replace(
    typeof(IHttpControllerActivator),
    new PoorMansCompositionRoot());

You can read about all the details here: http://blog.ploeh.dk/2012/09/28/DependencyInjectionandLifetimeManagementwithASP.NETWebAPI

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08-28 02:42
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