在aspx页上的引用，ashx页导致报表查看器声明中的错误。
我使用VB.NET构建了一个网站，我添加了一个名为reports.aspx的文件来处理一些报告。具体来说，它使用将报表从SSRS保存到PDF，然后重定向到一个名为reports.ashx的处理程序文件，该文件实际上处理打印。
reports.aspx代码
<%@ Page Language="VB" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="Microsoft.Reporting.WebForms" %>
<%-- Register the WebClientPrint script code --%>
<%=Neodynamic.SDK.Web.WebClientPrint.CreateScript(MyUtils.GetWebsiteRoot() + "reports.ashx")%>
<!DOCTYPE html>
<script language="VB" runat="server">
Private Sub Page_Load(sender As Object, e As EventArgs)
Dim reportname As String
Dim paramBlock As New ReportParameter()
Dim paramID As New ReportParameter()
reportname = Request("reportname")
Dim v As New ReportViewer
v.ProcessingMode = ProcessingMode.Remote
Dim serverreport As New ServerReport
serverreport = v.ServerReport
serverreport.ReportServerUrl = New Uri("http://websql1.core.com/Reports")
serverreport.ReportPath = "/Reports/Aramid/Sheeter/" & reportname
Select Case reportname
Case Is = "NomexBlockCard" Or "NomexBlockLabel" Or "NomexInternalLabel"
paramBlock.Name = "paramBlock"
paramBlock.Values.Add(Request("paramBlock"))
Dim parameters() As ReportParameter = {paramBlock}
Case Is = "NomexRoutingData"
paramID.Name = "paramID"
paramID.Values.Add(Convert.ToInt32(Request("paramID")))
Dim parameters() As ReportParameter = {paramID}
End Select
serverreport.SetParameters(parameters)
Save(serverreport, "~/Files/")
'now print
Response.Redirect("reports.ashx?fileName=" & reportname)
End Sub
Public Sub Save(ByVal sr As ServerReport, ByVal savePath As String)
Dim Bytes() As Byte = sr.Render("PDF", "", Nothing, Nothing, Nothing, Nothing, Nothing)
Using Stream As New FileStream(savePath, FileMode.Create)
Stream.Write(Bytes, 0, Bytes.Length)
End Using
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
</body>
</html>reports.ashx代码
<%@ WebHandler Language="VB" Class="reports" %>
Imports System
Imports System.Web
Imports Neodynamic.SDK.Web
Public Class reports : Implements IHttpHandler
Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
Dim useDefaultPrinter As Boolean = True '(context.Request("useDefaultPrinter") = "checked")
Dim printerName As String = context.Server.UrlDecode(context.Request("printerName"))
Dim fileName As String = context.Server.UrlDecode(context.Request("fileName"))
Dim filePath As String = "~/Files/"
If (filePath <> Nothing) Then
Dim file As New PrintFile(context.Server.MapPath(filePath), fileName)
Dim cpj As New ClientPrintJob()
cpj.PrintFile = file
If (useDefaultPrinter OrElse printerName = "null") Then
cpj.ClientPrinter = New DefaultPrinter()
Else
cpj.ClientPrinter = New InstalledPrinter(printerName)
End If
cpj.SendToClient(context.Response)
End If
End Sub
Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
Get
Return False
End Get
End Property
End Class打开Visual以生成和发布时，会得到以下错误。
“从模块system.web.httpcontextbase程序集导入system.web类型失败”
当我查看reports.aspx中的代码时，行下出现了一个错误
Dim v as New ReportViewer错误更正选项指出，“需要引用System.Web.Extensions版本= 3.5.0.0，.包含已实现的接口System.Web.UI.IScriptControl。
我指的是System.Web、System.Web.Extensions和System.Web.Abstractions。
靶向.NET 4
请帮助我理解这个问题或需要看什么。
谢谢!
回答 1
Stack Overflow用户
发布于 2014-10-09 13:08:03
结果是很简单的事情。当我在Webmatrix中启动该项目时，随着它的增长，我将它移到了Visual解决方案中。当我将它移到解决方案时，它将目标框架更改为2.0而不是4。
真奇怪。把目标变回4，更新参考资料，好去！
https://stackoverflow.com/questions/26196131
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