主要是使用 Printing.PreviewPrintController 的產生預覽圖片的功能來儲存列印內容, 再把圖片送到印表機, 以保証列印內容和儲存的圖檔是一致的. 值得一提的是, 在預覽時可以使用不同的印表機, 以便讓產生較小的圖檔, 否則有時會發生 GDI+ 的錯誤.

Sample 如下:

Imports System.Drawing.Printing

Namespace X

    Partial Public Class PrintSomething

        Dim PD As PrintDocument

        Dim ppc As New Printing.PreviewPrintController()

        Dim TotalPage As Int32 = 0

        ''' <summary>

        ''' 第幾次列印, 用來控制寫出的圖檔

        ''' </summary>

        ''' <remarks></remarks>

        Dim PrintCount As Int32 = 1

        Dim PageCount As Int32 = 1

            :

            :

            :

      

        Sub New(ByVal oPM As DB.PackingListMain, ByVal dtDetail As DataTable, dtUsedCoupon As DataTable)

            '初始化資料

            :

            :

            :

        End Sub

        Sub InitPrintDocument()

            '在這裡設定 PrintDocument 的紙張, 印表機, 邊界, 橫印或直印

            PD = New PrintDocument

            :

            :

            :

        End Sub

        Sub print()

            InitPrintDocument()

            PD.PrintController = ppc

           

            ' 第一次先把列印結果存在 Printing.PreviewPrintController 中

            AddHandler PD.PrintPage, AddressOf GeneratePreview

            '再來儲存圖片

            AddHandler PD.EndPrint, AddressOf SaveImage

            PD.Print()

        End Sub



        Dim ppi() As Printing.PreviewPageInfo

        Dim PrintPage As Int32 = 0

        Sub SaveImage(ByVal sender As Object, ByVal ev As PrintEventArgs)

            PrintDebug("Save Image Start, " & Now.ToString("yyyy-MM-dd HH:mm:ss.fff"))

            '把圖檔存起來

            Dim TF As String = Now.ToString("yyyyMMddHHmmss") ' DB.SysConfig.Path.LocalDataRoot

            Dim PathLocal As String = "C:\PrintLog\" & TF.Substring(0, 4) & "-" & TF.Substring(4, 2) & "\"

            Dim PathPackingListSheetImage As String = DB.SysConfig.PackingListSheetImage & TF.Substring(0, 4) & "-" & TF.Substring(4, 2) & "\"

            System.IO.Directory.CreateDirectory(PathLocal)

            System.IO.Directory.CreateDirectory(PathPackingListSheetImage)

            Dim LatestImages As String = ""

            ppi = ppc.GetPreviewPageInfo()

            For x As Integer = 0 To ppi.Length - 1

                Dim Filename As String = TF & "_" & Me.oPM.Id & "_" & x & ".png"

                ppi(x).Image.Save(PathLocal & Filename, System.Drawing.Imaging.ImageFormat.Png)

            Next



            '把圖檔印出來

            For x As Integer = 0 To ppi.Length - 1

  '建立新的 PrintDocument

                InitPrintDocument()

                If CST.WebConfig.Server_NAME = "測試主機" Then

                    UW.WU.DebugWriteLine("PrinterName: " & Me.PD.PrinterSettings.PrinterName)

                    UW.WU.DebugWriteLine("PaperSize: " & PD.DefaultPageSettings.PaperSize.PaperName)

                    PD.DocumentName = "PackingList"

                    PD.PrinterSettings.PrintFileName = "C:\PDF\PackingList" & Now.ToString("yyyyMMddHHmmss") & "_" & PrintPage & ".prn"

                    PD.PrinterSettings.PrintToFile = True

                    'PD.PrinterSettings.

                End If

                '很奇怪, 這裡不會分頁, 所以要一張一張印   

                AddHandler PD.PrintPage, AddressOf pd_PrintPage2

                PD.Print()



               PrintPage += 1

            Next

        End Sub

        Private Sub pd_PrintPage2(ByVal sender As Object, ByVal ev As PrintPageEventArgs)

            '很奇怪, 這裡不會分頁, 所以要一張一張印           

            ev.Graphics.DrawImage(ppi(PrintPage).Image, 0, 0)

            ev.HasMorePages = False

        End Sub



        Private Sub GeneratePreview(ByVal sender As Object, ByVal ev As PrintPageEventArgs)

            ' 列印內容

        End Sub

        End Class

    End Class

End Namespace

※修改主目錄web.config
刪除(紅字)
＊<compilation debug="true" targetFramework="4.0">
＊<httpRuntime maxRequestLength="102400" requestValidationMode="2.0"></httpRuntime>




※修改虛擬目錄web.config
加上<remove assembly="...." />




1.如果网站程序不需要ASP.NET 4‎.0 的支持，那么可以直接配置网站使用ASP.NET 2.0。
2.如果网站程序需要ASP.NET 4‎.0的支持，就需要将该网站下使用ASP.NET 2.0的虚拟目录移动到其他网站。
3.如果上面两种方法都不适用于你的实际情况，那么就只能用这种方法了：

打开注册表找到“HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\ASP.NET\\4.0.30319.0”
添加键值名为“EnableExtensionlessUrls” 类型为“DWORD”的键值
并设置值为"0"

然后在cmd中运行“IISRESET”，重启IIS以读取注册表修改后的内容。
(重啟該應用程式集區即可)：

注：此项修改就是关闭ASP.NET 4‎.0对无扩展URL的处理，若将此项键值设为“1”则开启。
參考：http://www.webjx.com/aspnet/2011-04-02/29024.html

A potentially dangerous Request.Form value was detected from the client (ContentBody_txtContent="<style type="text/cs...").

.aspx新增了<%@ Page validateRequest="false"%>

最後找到還需要在web.config裡面新增<httpRuntime requestValidationMode="2.0" />

相關專案: SINGTEX

[InvalidOperationException: 由於該物件目前的狀態，導致作業無效。]

   System.Web.HttpValueCollection.ThrowIfMaxHttpCollectionKeysExceeded() +2692302

   System.Web.HttpValueCollection.FillFromEncodedBytes(Byte[] bytes, Encoding encoding) +61

   System.Web.HttpRequest.FillInFormCollection() +148



[HttpException (0x80004005): URL 編碼型式資料無效。]

   System.Web.HttpRequest.FillInFormCollection() +206

   System.Web.HttpRequest.get_Form() +68

   System.Web.HttpRequest.get_HasForm() +8735447

   System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull) +97

   System.Web.UI.Page.DeterminePostBackMode() +63

   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +133

Error Msg:

若你的 Web 應用程式真的會傳遞超過 1,000 個欄位時，這個預設值也是可以設定的，請修改網站根目錄下的 web.config 檔，並在 區段加上一組 aspnet:MaxHttpCollectionKeys 設定即可：

<appSettings>

 <add key="aspnet:MaxHttpCollectionKeys" value="2500" />

</appSettings>

參考說明：
http://blog.miniasp.com/post/2012/01/01/Efficient-Denial-of-Service-Attacks-on-Web-Application-Platforms.aspx