LocalReport.Render Método (String, String, CreateStreamCallback, array<Warning %)

Procesa el informe y lo presenta en el formato especificado mediante una secuencia proporcionada por una función de devolución de llamada.

Espacio de nombres: Microsoft.Reporting.WebForms
Ensamblado: Microsoft.ReportViewer.WebForms (en Microsoft.ReportViewer.WebForms.dll)

Sintaxis

'Declaración
Public Sub Render ( _
    format As String, _
    deviceInfo As String, _
    createStream As CreateStreamCallback, _
    <OutAttribute> ByRef warnings As Warning() _
)
'Uso
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[]
)

Parámetros

format
Tipo: System.String
Formato en el que se presenta el informe. Este argumento se asigna a una extensión de presentación. Los formatos admitidos son Excel, PDF, Word e Image.
Para tener acceso a una lista de las extensiones de representación disponibles, utilice el método ListRenderingExtensions.

deviceInfo
Tipo: System.String
Cadena XML que incluye el contenido específico del dispositivo que necesita la extensión de presentación especificada en el parámetro de formato. Para obtener más información sobre parámetros de información de dispositivos para formatos de salida específicos, vea Device Information Settings en los Libros en pantalla de SQL Server.

createStream
Tipo: Microsoft.Reporting.WebForms.CreateStreamCallback
Una función delegada CreateStreamCallback que se utilizará para proporcionar un objeto Stream para la presentación.

warnings
Tipo: array<Microsoft.Reporting.WebForms.Warning[]%
[out] Matriz de objetos Warning que describe todas las advertencias ocurridas durante el procesamiento y la representación del informe.

Comentarios

Este método acepta una función delegada CreateStreamCallback en el argumento createStreamCallback para admitir el control personalizado de los flujos. Este método es útil para la impresión.

Ejemplos

El siguiente ejemplo de código muestra el uso del método Render con una función de devolución de llamada 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.WebForms

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.WebForms;

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;
    }
}

Vea también

Referencia

LocalReport Clase

Sobrecarga de Render

Espacio de nombres Microsoft.Reporting.WebForms

Last updated on 2011-05-09