asp.net - 自定义 HttpHandler 错误 : Could not load type 'FileProtectionHandler'

Question

我正在尝试实现一个自定义 HttpHandler(第一次)，我已经获得了一个教程，但无法让它工作。然后我找到了另一个教程，但无法使其正常工作，它们都给了我相同的错误消息。

自定义处理程序是为了保护人们免于下载某些文件类型，尽管我认为该错误是某种配置问题，因为一旦我将 httpHandlers 添加到 Web.Config 文件中，我就无法让网站正常工作。

    Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: Could not load type 'FileProtectionHandler'.

Source Error:

Line 47:         </compilation>
Line 48:         <httpHandlers>
Line 49:             <add verb="*" path="*.pdf" type="FileProtectionHandler"/>
Line 50:         </httpHandlers>

如果您需要更多代码，请告诉我。

谢谢你的帮助。 J。

    <%@ WebHandler Language="VB" Class="FileProtectionHandler" %>

Imports System
Imports System.Web
Imports System.Web.Security
Imports System.IO
Imports System.Web.SessionState

Public Class FileProtectionHandler : Implements IHttpHandler

    Private Function SendContentTypeAndFile(ByVal context As HttpContext, ByVal strFile As [String]) As HttpContext
        context.Response.ContentType = GetContentType(strFile)
        context.Response.TransmitFile(strFile)
        context.Response.[End]()
        Return context
    End Function

    Private Function GetContentType(ByVal filename As String) As String
        ' used to set the encoding for the reponse stream
        Dim res As String = Nothing
        Dim fileinfo As New FileInfo(filename)

        If fileinfo.Exists Then
            Select Case fileinfo.Extension.Remove(0, 1).ToLower()
                Case "pdf"
                    If True Then
                        res = "application/pdf"
                        Exit Select
                    End If
            End Select

            Return res
        End If

        Return Nothing
    End Function

    Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
        context.Response.ContentType = "text/plain"
        context.Response.Write("Hello World")
    End Sub

    Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
        Get
            Return False
        End Get
    End Property

End Class

Answer 1

我有类似的问题。解决方案是在属性中定义的根命名空间中。
在我的代码中我没有命名空间，所以在这种情况下你需要使用

type="[namespace or root namespace].[your class name]"