Please let other users know how useful this tip is by rating it below. Do you have a tip or code of your own you'd like to share? Submit it here.
This tip shows how to output a report at runtime that launches a new window with a .PDF version of the report.
This example assumes you have a .NET report named ReportFile included in the ASP.NET project. Create a blank ASP.NET form and add the data objects (data adapter, connection, dataset) to match the report file. Then set the page.load event to the following:
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
'Populate the data source of the report.
Me.daDataAdapter.Fill(Me.dsDataSet1)
Dim crReport As New ReportFile
crReport.SetDataSource(dsDataSet1)
'Change the output stream of the current form
Dim strStream As New System.IO.BinaryReader(crReport.ExportToStream
(CrystalDecisions.[Shared].ExportFormatType.PortableDocFormat))
Response.ClearContent()
Response.ClearHeaders()
Response.ContentType = "application/pdf"
Response.BinaryWrite(strStream.ReadBytes(strStream.BaseStream.Length))
Response.Flush()
Response.Close()
End Sub
By redirecting to this form, it will populate the dataset, load the report as a .PDF and redirect that output stream to the client.
To have it launch in its own window, open the form with JavaScript. Often, I will have a form with a repeater control to display data from a database, and at the bottom, I'll have a button to display a printable version. That button opens the report Web form in a new window:
<INPUT onclick="javascript:window.open('PrintPage.aspx')" type="button"
value="View Printable Version">
If you need to supply a parameter, open the page with a querystring and read that value in the page.load event. Use a parameter item for the DataAdapter.Fill:
<INPUT onclick="javascript:window.open('PrintPage.aspx?Param=Hello')"
type="button" value="View Printable Version">
PrintPage.aspx page.load event:
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
'Get parameter value from querystring
Dim tcParam As String
tcParam = Me.Request.QueryString.Get("Param")
Me.daDataAdapter.SelectCommand.Parameters("@tValue").Value = tcParam
Me.daDataAdapter.Fill(Me.dsDataSet1)
Dim crReport As New ReportFile
crReport.SetDataSource(dsDataSet1)
Dim strStream As New System.IO.BinaryReader(crReport.ExportToStream
(CrystalDecisions.[Shared].ExportFormatType.PortableDocFormat)
Response.ClearContent()
Response.ClearHeaders()
Response.ContentType = "application/pdf"
Response.BinaryWrite(strStream.ReadBytes(strStream.BaseStream.Length))
Response.Flush()
Response.Close()
End Sub
I hope this helps spark some new ideas for using reports in ASP.NET. Thanks!
