Question

当我尝试上传大小为9MB的文档时，遇到“超出最大长度”错误。我知道如果web.config中的httpRuntime maxRequestLength和requestLengthDiskThreshold增加，问题就会解决，但我正在寻找的是如何很好地处理错误并向我们展示消息用户。我确实尝试在全局ascx中使用Application_Error事件，但事件未被触发。原因可能来自Server.Transfer来自DNN PageBase类的OnError方法产品规格：

NET 3.5 SP1（ASP.NET）
IIS 6
DotNetNuke 5.4.4（2）

非常紧急，非常感谢您的建议。感谢

Answer 1

几个月前我有类似的问题，这篇文章非常有帮助：http://www.velocityreviews.com/forums/showpost.php?p=3794467&postcount=8

基本上，您将代码添加到global.asax codebehind以嗅探每个页面请求。如果附加了一个文件，它会在上传到您的实际页面之前检查文件大小..就像一个冠军。

我需要在VB中使用它，所以只要你也这样做..我会为你节省转换;）

Sub Application_BeginRequest(ByVal sender As Object, ByVal e As EventArgs)

    Dim runtime As System.Web.Configuration.HttpRuntimeSection = System.Web.Configuration.WebConfigurationManager.GetSection("system.web/httpRuntime")
    Dim maxRequestLength As Integer = (runtime.MaxRequestLength - 100) * 1024

    Dim context As HttpContext = CType(sender, HttpApplication).Context

    If context.Request.ContentLength > maxRequestLength Then
        Dim pro As IServiceProvider = CType(context, IServiceProvider)
        Dim workerRequest As HttpWorkerRequest = DirectCast(pro.GetService(GetType(HttpWorkerRequest)), HttpWorkerRequest)

        If workerRequest.HasEntityBody Then
            Dim requestLength As Integer = workerRequest.GetTotalEntityBodyLength

            Dim initialBytes As Integer = 0

            If workerRequest.GetPreloadedEntityBody IsNot Nothing Then initialBytes = workerRequest.GetPreloadedEntityBody.Length

            If Not workerRequest.IsEntireEntityBodyIsPreloaded Then
                Dim buffer As Byte() = New Byte(511999) {}
                Dim receivedBytes As Integer = initialBytes

                While (requestLength - receivedBytes) >= initialBytes
                    initialBytes = workerRequest.ReadEntityBody(buffer, buffer.Length)
                    receivedBytes += initialBytes

                End While
                initialBytes = workerRequest.ReadEntityBody(buffer, requestLength - receivedBytes)
            End If

            Response.Redirect("~/errorPages/MaxLength.htm")

        End If
    End If



End Sub

如何正确处理“超出最大长度”错误？

1 个答案: