asp.net-mvc-4 – 从beta版升级后的Autofac / MVC4 / WebApi(RC)依赖注入问题

var resolver = new AutofacWebApiDependencyResolver(container);
configuration.ServiceResolver.SetResolver(resolver);

更新到ASP.NET MVC4(RC)后,我得到以下错误：

‘System.Web.Http.HttpConfiguration’ does not contain a definition for
‘ServiceResolver’ and no extension method ‘ServiceResolver’ accepting
a first argument of type ‘System.Web.Http.HttpConfiguration’ could be
found (are you missing a using directive or an assembly reference?)

看到这些接口已经改变了(http://www.asp.net/web-api/overview/extensibility/using-the-web-api-dependency-resolver)后,我意识到,但我不知道如何应用这个改变如何使用Autofac.

我需要等待Autofac的新版本,还有另一种方式可以超越这个.

解决方法

基本上,使用新的包,您只需要在global.asax.cs中执行此操作：

GlobalConfiguration.Configuration.DependencyResolver = new Autofac.Integration.WebApi.AutofacWebApiDependencyResolver(container);

/编辑

我刚刚遇到同样的问题 – 我能够通过创建一个简单的IDependencyResolver实现来解决它在我的情况下,包装现有的AutofacDependencyResolver.

正如类名称所示,我将其视为临时解决方案 – BeginScope和Dispose方法将需要一些工作,显然不适合于生产环境,但这允许我继续开发,直到出现正确的解决方案.

所以,有了这些注意事项,IDependencyResolver实现如下所示：

public class TemporaryDependencyResolver : IDependencyResolver
{
    private readonly AutofacDependencyResolver _autofacDependencyResolver;

    public TemporaryDependencyResolver(AutofacDependencyResolver autofacDependencyResolver)
    {
        _autofacDependencyResolver = autofacDependencyResolver;
    }

    public void Dispose()
    {
    }

    public object GetService(Type serviceType)
    {
        return _autofacDependencyResolver.GetService(serviceType);
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        return _autofacDependencyResolver.GetServices(serviceType);
    }

    public IDependencyScope BeginScope()
    {
        return this;
    }
}

我在Global.asax.cs中设置了它：

var container = builder.Build();
var resolver = new AutofacDependencyResolver(container);
GlobalConfiguration.Configuration.DependencyResolver = new TemporaryDependencyResolver(resolver);

（编辑：安卓应用网）

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