Question

我正在处理一些错误的东西，我尝试将Richard Dingwall的例子转换为VB.NET。问题是我收到了一个错误：

类型ResourceNotFoundException未定义

'<AttributeUsage(AttributeTargets.[Class] Or AttributeTargets.Method, Inherited:=True, AllowMultiple:=False)> _'
Public NotInheritable Class HandleResourceNotFoundAttribute : Inherits FilterAttribute : Implements IExceptionFilter
    Public Property View() As String

    Public Sub New()
        View = "NotFound"
    End Sub

    Public Sub New(ByVal _view As String)
        View = _view
    End Sub

    Public Sub OnException(ByVal filterContext As ExceptionContext) Implements System.Web.Mvc.IExceptionFilter.OnException
        Dim controller As Controller = TryCast(filterContext.Controller, Controller)
        If controller Is Nothing OrElse filterContext.ExceptionHandled Then
            Return
        End If

        Dim exception As Exception = filterContext.Exception
        If exception Is Nothing Then
            Return
        End If

        ''# Action method exceptions will be wrapped in a
        ''# TargetInvocationException since they're invoked using 
        ''# reflection, so we have to unwrap it.
        If TypeOf exception Is TargetInvocationException Then
            exception = exception.InnerException
        End If

        ''# If this is not a ResourceNotFoundException error, ignore it.

        ''# ###############################
        ''# ###############################

        If Not (TypeOf exception Is ResourceNotFoundException) Then ''# ERROR HERE

        ''# ###############################
        ''# ###############################

            Return
        End If

        filterContext.Result = New ViewResult() With { _
         .TempData = controller.TempData, _
         .ViewName = View _
        }

        filterContext.ExceptionHandled = True
        filterContext.HttpContext.Response.Clear()
        filterContext.HttpContext.Response.StatusCode = 404
    End Sub
End Class

Answer 1

如果您阅读Richard Dingwall的帖子（我假设是this one），您会注意到ResourceNotFound异常是他创建的自定义异常，并提供了代码。您需要自己实现该异常类，以便编译器识别该类。

ASP.NET - ResourceNotFoundException是Undefined

1 个答案: