演练：在不预览的情况下打印本地报表

项目
08/22/2008

本演练演示如何使用 LocalReport 对象和 CreateStreamCallback 回调函数以编程方式在不查看的情况下打印报表。

系统必备

您必须具有访问示例报表和数据源的权限。有关更多信息，请参见用于打印演练的示例数据和报表。

执行下列步骤可创建 Microsoft Visual Studio 控制台应用程序项目。

创建新的控制台应用程序项目

在**“文件”菜单上，指向“新建”，然后选择“项目”**。
在**“项目类型”窗格中，选择“Visual C#”或“Visual Basic”和“Windows”**。
在**“模板”窗格中，选择“控制台应用程序”**以创建 Microsoft 控制台应用程序。
在**“名称”框中，键入项目的名称：“打印本地报表”**。
在**“位置”框中，输入要保存项目的目录，或者单击“浏览”以导航到该目录。随即将打开项目，并在“代码”窗口中显示“Program”**代码文件。

添加引用

从**“项目”菜单中，选择“添加引用”。将显示“添加引用”**对话框。
从“.NET”选项卡上显示的列表框中，选择 System.Drawing、System.Windows.Forms 和 Microsoft.Reporting.Winforms。

添加现有的 report.rdlc 和 data.xml 文件

从**“项目”菜单中选择“添加现有项”。随即将显示“添加现有项”**对话框。
定位到保存 report.rdlc 和 data.xml 的文件夹。然后选择这两个文件。
单击**“添加”**。这两个文件将作为项目的一部分显示在解决方案资源管理器中。

添加代码

Program 代码文件应该已经打开并处于待编辑状态。如果该文件尚未打开，请在**“解决方案资源管理器”窗口中双击“Program.cs”或“Module1.vb”**文件。

根据您的编程语言选择下面的代码，并用其替换**“Program”**文件中的现有代码。

对于 Visual C#，请使用下面的代码。

using System;
using System.IO;
using System.Data;
using System.Text;
using System.Drawing.Imaging;
using System.Drawing.Printing;
using System.Collections.Generic;
using System.Windows.Forms;
using Microsoft.Reporting.WinForms;

public class Demo : IDisposable
{
    private int m_currentPageIndex;
    private IList<Stream> m_streams;

    private DataTable LoadSalesData()
    {
        // Create a new DataSet and read sales data file 
        //    data.xml into the first DataTable.
        DataSet dataSet = new DataSet();
        dataSet.ReadXml(@"..\..\data.xml");
        return dataSet.Tables[0];
    }
    // Routine to provide to the report renderer, in order to
    //    save an image for each page of the report.
    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;
    }
    // Export the given report as an EMF (Enhanced Metafile) file.
    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;
    }
    // Handler for PrintPageEvents
    private void PrintPage(object sender, PrintPageEventArgs ev)
    {
        Metafile pageImage = new
           Metafile(m_streams[m_currentPageIndex]);
        ev.Graphics.DrawImage(pageImage, ev.PageBounds);
        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);
            MessageBox.Show(msg, "Print Error");
            return;
        }
        printDoc.PrintPage += new PrintPageEventHandler(PrintPage);
        printDoc.Print();
    }
    // Create a local report for Report.rdlc, load the data,
    //    export the report to an .emf file, and print it.
    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_streams = null;
        }
    }

    public static void Main(string[] args)
    {
        using (Demo demo = new Demo())
        {
            demo.Run();
        }
    }
}

对于 Visual Basic，请使用下面的代码。

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(ByVal name As String, _
       ByVal fileNameExtension As String, _
       ByVal encoding As Encoding, ByVal mimeType As String, _
       ByVal 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(ByVal 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(ByVal sender As Object, _
    ByVal 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)
            Console.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(ByVal args As String())
        Using demo As Demo = New Demo()
            demo.Run()
        End Using
    End Sub
End Class

编译和运行应用程序

在**“生成”菜单上单击“生成解决方案”以生成应用程序。在生成过程中，会编译报表并将发现的所有错误（例如报表中所用的表达式中的语法错误）都添加到“任务列表”**中。
按**“F5”**运行应用程序。

另请参见

参考

LocalReport
Microsoft.Reporting.WinForms.CreateStreamCallback
Microsoft.Reporting.WebForms.CreateStreamCallback

其他资源

示例和演练

通过

演练：在不预览的情况下打印本地报表

系统必备

创建新的控制台应用程序项目

添加引用

添加现有的 report.rdlc 和 data.xml 文件

添加代码

编译和运行应用程序

另请参见

参考

其他资源

其他资源