Visual Studio 2022：在单个Crystal Reports查看器/文件中展示多报表

我希望在单个Crystal Reports查看器中显示多份报表，或生成包含多份报表的单个文件，但不清楚具体实现方法。

目前我已实现单份报表在Crystal Reports查看器中的显示功能，代码如下：

private void btnDisplayInViewer_Click(object sender, EventArgs e)
{
    String Application_Path = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
    cryRpt = new ReportDocument();            
    cryRpt.Load(Application_Path + "\Order_Report.rpt");
    (cryRpt.ReportDefinition.ReportObjects["tOrder_Ref_Display"] as TextObject).Text = "1";
    crystalReportViewer1.ReportSource = cryRpt;
    crystalReportViewer1.Refresh();
}

同时也实现了将单份报表输出到文件的功能，代码如下：

private void btnToPrinter_Click(object sender, EventArgs e)
{
    String Application_Path = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
    cryRpt = new ReportDocument();
    cryRpt.Load(Application_Path + "\Order_Report.rpt");
    (cryRpt.ReportDefinition.ReportObjects["tOrder_Ref_Display"] as TextObject).Text = "1";
    cryRpt.PrintToPrinter(1/*Copies*/, true/*collated*/, 0/*Start Page*/, 0/*End Page*/);
}

请问有无示例代码可实现上述任一场景的多报表合并，以在单个查看器/文件中展示？

我使用PDFSharp组件实现了多份Crystal Report合并为单个PDF文件的需求，具体操作如下：

1. 安装PDFSharp #

通过Visual Studio的工具 > NuGet包管理器 > 管理解决方案的NuGet包搜索并安装PDFSharp组件。

2. 添加引用与using指令 #

确保项目已添加PDFSharp相关引用，并在代码文件顶部添加以下using指令：

using PdfSharp;
using PdfSharp.Pdf.IO;
using PdfSharp.Pdf;
using PdfSharp.Drawing;
using System.Diagnostics;
using System.IO;//File.Delete

3. 示例代码 #

以下代码可循环生成多份报表，导出为临时PDF后合并成单个文档：

private void btnExport_Multiple_PDFs_Click(object sender, EventArgs e)
{
    String Destination_File_Location_Name = "c:\\Temp\\";
    String PDF_File_Extension = ".pdf";
    String Report_Name = "Report.rpt";

    #region Nested method to add pages.
    void CopyPages(PdfDocument from, PdfDocument to)
    {
        for (int i = 0; i < from.PageCount; i++)
        {
            to.AddPage(from.Pages[i]);
        }
    }
    #endregion Nested method to add pages.

    ExportOptions CrExportOptions;
    DiskFileDestinationOptions CrDiskFileDestinationOptions = new DiskFileDestinationOptions();
    PdfRtfWordFormatOptions CrFormatTypeOptions = new PdfRtfWordFormatOptions();
    String Application_Path = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);

    PdfDocument outPdf = new PdfDocument();

    #region Loop through a number of times to generate multiple reports.
    for (int m = 1; m < 4; m++)
    {
        CrDiskFileDestinationOptions.DiskFileName = Destination_File_Location_Name + m.ToString() + PDF_File_Extension;

        cryRpt = new ReportDocument();
        cryRpt.Load(Application_Path + "\\" + Report_Name);
        (cryRpt.ReportDefinition.ReportObjects["tOrder_Ref_Display"] as TextObject).Text = m.ToString();
        CrExportOptions = cryRpt.ExportOptions;
        {
            CrExportOptions.ExportDestinationType = ExportDestinationType.DiskFile;
            CrExportOptions.ExportFormatType = ExportFormatType.PortableDocFormat;
            CrExportOptions.DestinationOptions = CrDiskFileDestinationOptions;
            CrExportOptions.FormatOptions = CrFormatTypeOptions;
        }
        cryRpt.Export();

        PdfDocument one = PdfReader.Open(CrDiskFileDestinationOptions.DiskFileName, PdfDocumentOpenMode.Import);
        CopyPages(one, outPdf);
        // Remove the Crystal Report File thats been exported
        File.Delete(CrDiskFileDestinationOptions.DiskFileName);
    }
    #endregion Loop through a number of times to generate multiple reports.

    #region Check Temp Directory Exists. If not the create. 
    if (!Directory.Exists(Destination_File_Location_Name))
    {
        Directory.CreateDirectory(Destination_File_Location_Name);
    }
    #endregion Check Temp Directory Exists. If not the create.            

    // Save the Output PDF to file
    outPdf.Save(Destination_File_Location_Name + PDF_File_Extension);
    // Preview the PDF
    Process.Start(Destination_File_Location_Name + PDF_File_Extension);
}

功能说明 #

代码通过循环生成多份Crystal Report，将每份报表导出为临时PDF文件，再通过PDFSharp将临时PDF的页面合并到一个最终PDF中，最后自动删除临时文件并打开合并后的PDF文档。

内容的提问来源于stack exchange，提问作者Yuppski