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我有现有的项目,它使用AutoFac作为IoC.

在注册码中我有这些线:

var resolver = builder.Build();
DependencyResolver.SetResolver(new AutofacDependencyResolver(resolver));
config.DependencyResolver = new AutofacWebApiDependencyResolver(resolver);

所以我的问题是DependencyResolver.SetResolver和之间的区别是什么HttpConfiguration.DependecyResolver？我为什么要指定它们？