在ASP.NET中直接匯出，不需產生檔案或暫存檔

問題:
在ASP.NET中可否直接匯出，不需產生檔案或暫存檔?

答案:
如下程式可直接將報表匯出成PDF格式給使用者瀏覽，不會產生檔案。

Dim crExportOptions As CrystalDecisions.Shared.ExportOptions
 

Dim RptDoc as New ReportDocument
dim rptFile as String =Server.MapPath("AsiaCustomers.rpt")
RptDoc.Load ( rptFile )  
 
RptDoc.ExportOptions.ExportFormatType = CrystalDecisions.Shared.ExportFormatType.PortableDocFormat
RptDoc.ExportOptions.FormatOptions = New PdfRtfWordFormatOptions()
 
Dim req As New ExportRequestContext()
req.ExportInfo = RptDoc.ExportOptions
 
Response.ClearContent()
Response.ClearHeaders()
Response.ContentType = "application/pdf"
 
Dim s As System.IO.Stream
s = RptDoc.FormatEngine.ExportToStream(req)
s.Seek(0,IO.SeekOrigin.Begin )
Dim buffer(s.Length) As Byte
s.Read(buffer, 0, s.Length)
Response.BinaryWrite(buffer)
Response.End()

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