Metodo LocalReport.Render (String, String, CreateStreamCallback, array<Warning %)
Elabora il rapporto e ne esegue il rendering nel formato specificato utilizzando il flusso restituito da una funzione di richiamata.
Spazio dei nomi Microsoft.Reporting.WinForms
Assembly: Microsoft.ReportViewer.WinForms (in Microsoft.ReportViewer.WinForms.dll)
Sintassi
'Dichiarazione
Public Sub Render ( _
format As String, _
deviceInfo As String, _
createStream As CreateStreamCallback, _
<OutAttribute> ByRef warnings As Warning() _
)
'Utilizzo
Dim instance As LocalReport
Dim format As String
Dim deviceInfo As String
Dim createStream As CreateStreamCallback
Dim warnings As Warning()
instance.Render(format, deviceInfo, createStream, _
warnings)
public void Render(
string format,
string deviceInfo,
CreateStreamCallback createStream,
out Warning[] warnings
)
public:
void Render(
String^ format,
String^ deviceInfo,
CreateStreamCallback^ createStream,
[OutAttribute] array<Warning^>^% warnings
)
member Render :
format:string *
deviceInfo:string *
createStream:CreateStreamCallback *
warnings:Warning[] byref -> unit
public function Render(
format : String,
deviceInfo : String,
createStream : CreateStreamCallback,
warnings : Warning[]
)
Parametri
- format
Tipo: System.String
Formato in cui eseguire il rendering del rapporto. Questo argomento esegue il mapping a un'estensione per il rendering. I formati supportati sono Excel, Word e Image.
Per accedere all'elenco di estensioni per il rendering disponibili, utilizzare il metodo ListRenderingExtensions.
- deviceInfo
Tipo: System.String
Stringa XML che include il contenuto specifico del dispositivo necessario per l'estensione per il rendering specificata nel parametro relativo al formato. Per ulteriori informazioni sulle impostazioni delle informazioni relative a dispositivi per specifici formati di output, vedere Device Information Settings nella documentazione online di SQL Server.
- createStream
Tipo: Microsoft.Reporting.WinForms.CreateStreamCallback
Funzione di delegato CreateStreamCallback da utilizzare per l'implementazione di un oggetto Stream per il rendering.
- warnings
Tipo: array<Microsoft.Reporting.WinForms.Warning[]%
[out] Matrice di oggetti Warning che descrive gli avvisi generati durante l'elaborazione e il rendering del rapporto.
Osservazioni
Questo metodo accetta una funzione di delegato CreateStreamCallback nell'argomento createStreamCallback per il supporto della gestione personalizzata di flussi. È inoltre utile per la stampa.
Esempi
Nell'esempio di codice seguente viene illustrato l'utilizzo del metodo Render con una funzione di richiamata CreateStreamCallback.
Imports System.IO
Imports System.Data
Imports System.Text
Imports System.Drawing.Imaging
Imports System.Drawing.Printing
Imports System.Collections.Generic
Imports Microsoft.Reporting.WinForms
Public Class Demo
Implements IDisposable
private m_currentPageIndex As Integer
private m_streams As IList(Of Stream)
Private Function LoadSalesData() As DataTable
Dim dataSet As New DataSet()
dataSet.ReadXml("data.xml")
Return dataSet.Tables(0)
End Function
Private Function CreateStream(name As String, _
fileNameExtension As String, _
encoding As Encoding, mimeType As String, _
willSeek As Boolean) As Stream
Dim stream As Stream = New FileStream(name + "." + fileNameExtension, FileMode.Create)
m_streams.Add(stream)
Return stream
End Function
Private Sub Export(report As LocalReport)
Dim deviceInfo As string = _
"<DeviceInfo>" + _
" <OutputFormat>EMF</OutputFormat>" + _
" <PageWidth>8.5in</PageWidth>" + _
" <PageHeight>11in</PageHeight>" + _
" <MarginTop>0.25in</MarginTop>" + _
" <MarginLeft>0.25in</MarginLeft>" + _
" <MarginRight>0.25in</MarginRight>" + _
" <MarginBottom>0.25in</MarginBottom>" + _
"</DeviceInfo>"
Dim warnings() As Warning = Nothing
m_streams = New List(Of Stream)()
report.Render("Image", deviceInfo, _
AddressOf CreateStream, warnings)
Dim stream As Stream
For Each stream In m_streams
stream.Position = 0
Next
End Sub
Private Sub PrintPage(sender As Object, ev As PrintPageEventArgs)
Dim pageImage As New Metafile(m_streams(m_currentPageIndex))
ev.Graphics.DrawImage(pageImage, ev.PageBounds)
m_currentPageIndex += 1
ev.HasMorePages = (m_currentPageIndex < m_streams.Count)
End Sub
Private Sub Print()
Const printerName As String = "Microsoft Office Document Image Writer"
If m_streams Is Nothing Or m_streams.Count = 0 Then
Return
End If
Dim printDoc As New PrintDocument()
printDoc.PrinterSettings.PrinterName = printerName
If Not printDoc.PrinterSettings.IsValid Then
Dim msg As String = String.Format(_
"Can't find printer ""{0}"".", printerName)
Debug.WriteLine(msg)
Return
End If
AddHandler printDoc.PrintPage, AddressOf PrintPage
printDoc.Print()
End Sub
Private Sub Run()
Dim report As LocalReport = new LocalReport()
report.ReportPath = "Report.rdlc"
report.DataSources.Add(new ReportDataSource("Sales", LoadSalesData()))
Export(report)
m_currentPageIndex = 0
Print()
End Sub
Public Overloads Sub Dispose() Implements IDisposable.Dispose
If Not (m_streams Is Nothing) Then
Dim stream As Stream
For Each stream In m_streams
stream.Close()
Next
m_streams = Nothing
End If
End Sub
Public Shared Sub Main(args as string())
Using demo As Demo = new Demo()
demo.Run()
End Using
End Sub
End Class
using System;
using System.IO;
using System.Data;
using System.Text;
using System.Drawing.Imaging;
using System.Drawing.Printing;
using System.Collections.Generic;
using Microsoft.Reporting.WinForms;
public class Demo : IDisposable
{
private int m_currentPageIndex;
private IList<Stream> m_streams;
private DataTable LoadSalesData()
{
DataSet dataSet = new DataSet();
dataSet.ReadXml("data.xml");
return dataSet.Tables[0];
}
private Stream CreateStream(string name, string fileNameExtension,
Encoding encoding, string mimeType, bool willSeek)
{
Stream stream = new FileStream(name + "." + fileNameExtension,
FileMode.Create);
m_streams.Add(stream);
return stream;
}
private void Export(LocalReport report)
{
string deviceInfo =
"<DeviceInfo>" +
" <OutputFormat>EMF</OutputFormat>" +
" <PageWidth>8.5in</PageWidth>" +
" <PageHeight>11in</PageHeight>" +
" <MarginTop>0.25in</MarginTop>" +
" <MarginLeft>0.25in</MarginLeft>" +
" <MarginRight>0.25in</MarginRight>" +
" <MarginBottom>0.25in</MarginBottom>" +
"</DeviceInfo>";
Warning[] warnings;
m_streams = new List<Stream>();
report.Render("Image", deviceInfo, CreateStream, out warnings);
foreach (Stream stream in m_streams)
stream.Position = 0;
}
private void PrintPage(object sender, PrintPageEventArgs ev)
{
Metafile pageImage =
new Metafile(m_streams[m_currentPageIndex]);
ev.Graphics.DrawImage(pageImage, 0, 0);
m_currentPageIndex++;
ev.HasMorePages = (m_currentPageIndex < m_streams.Count);
}
private void Print()
{
const string printerName =
"Microsoft Office Document Image Writer";
if (m_streams == null || m_streams.Count == 0)
return;
PrintDocument printDoc = new PrintDocument();
printDoc.PrinterSettings.PrinterName = printerName;
if (!printDoc.PrinterSettings.IsValid)
{
string msg = String.Format("Can't find printer \"{0}\".",
printerName);
Debug.WriteLine(msg);
return;
}
printDoc.PrintPage += new PrintPageEventHandler(PrintPage);
printDoc.Print();
}
private void Run()
{
LocalReport report = new LocalReport();
report.ReportPath = "Report.rdlc";
report.DataSources.Add(new ReportDataSource("Sales", LoadSalesData()));
Export(report);
m_currentPageIndex = 0;
Print();
}
public void Dispose()
{
if (m_streams != null)
{
foreach (Stream stream in m_streams)
stream.Close();
m_streans = null;
}
}
public static int Main(string[] args)
{
using (Demo demo = new Demo())
{
demo.Run();
}
return 0;
}
}