Question

我试图查看控制器类名是否是传入的控制器名称的名称。我认为我的lambda表达式是错误的，这就是它无法正常工作的原因。我传入正确的控制器名称，但导出变量始终为null。

  Public Function CreateController(requestContext As System.Web.Routing.RequestContext,    
       controllerName As String) 
       As System.Web.Mvc.IController Implements 
       System.Web.Mvc.IControllerFactory.CreateController





    Dim controller As IController = Nothing

    If controllerName IsNot Nothing Then



        Dim controllerClassName As String = controllerName & "Controller"

        Dim export As Lazy(Of IController) = Me.container.GetExports(Of IController)().Where(
        Function(c)
            Return c.Value.GetType.Name = controllerClassName
        End Function
        ).FirstOrDefault()

如果您需要我澄清任何事情，请告诉我！谢谢！

Answer 1

是的，你的lambda表达式是错误的，这应该可以解决问题

Dim export As Lazy(Of IController) = Me.container.GetExports(Of IController)() _
                                              .Where(Function(c) c.Value.GetType.Name = controllerClassName) _
                                              .FirstOrDefault()

从MEF中的容器导出（Lambda表达式）

1 个答案: