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想象一个MVC在该解决方案中没有任何控制器的项目。我有同样的事情，想在运行时使用 aDefaultControllerFactory然后在我Global.asax的 by中注册它来创建控制器Autofac。在这里，我有一个具有CreateController方法的示例控制器工厂：

internal class CControllerFactory : DefaultControllerFactory
{
    private readonly Dictionary<string, Func<RequestContext, IController>> _controllerMap;

    public CControllerFactory()
    {
        List<IController> lstControllers = DependencyResolver.Current.GetServices<IController>().ToList();
        _controllerMap = new Dictionary<string, Func<RequestContext, IController>>();

        foreach (Controller contr in lstControllers)
        {
            string ctrName = contr.ControllerContext.RouteData.Values["Controller"].ToString();
            _controllerMap.Add(ctrName, c => contr);
        }
    }

    public override IController CreateController(RequestContext requestContext, string controllerName)
    {

        if (_controllerMap.ContainsKey(controllerName))
        {
            return _controllerMap[controllerName](requestContext);
        }
        else
            throw new KeyNotFoundException(controllerName);
    }
}

正如您在上面看到的，这一行：List<IController> lstControllers = DependencyResolver.Current.GetServices<IController>().ToList();将获取使用IController服务的控制器列表。但就我而言，解决方案中不存在控制器。我想在运行时创建一个新控制器并将其添加到我的_controllerMap.

所以我将代码更改为：

internal class CControllerFactory : DefaultControllerFactory
{
    private readonly Dictionary<string, Func<RequestContext, IController>> _controllerMap;

    public CControllerFactory()
    {
         // *Don't need this*
         // List<IController> lstControllers = DependencyResolver.Current.GetServices<IController>().ToList();
        _controllerMap = new Dictionary<string, Func<RequestContext, IController>>();
         // *Don't need this Foreach*
         // foreach (Controller contr in lstControllers)
         // {
               string ctrName = "Home";
               // But what about contr in this line?!?!:
               _controllerMap.Add(ctrName, c => contr);
         // }
    }

    public override IController CreateController(RequestContext requestContext, string controllerName)
    {

        if (_controllerMap.ContainsKey(controllerName))
        {
            return _controllerMap[controllerName](requestContext);
        }
        else
            throw new KeyNotFoundException(controllerName);
    }
}

那么contr在指定行呢？此参数的类型必须为Func<RequestContext,IController>。如何通过 C# 代码在功能上创建它？

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