Crystal Reports 无法打开连接 - 在 ReportDocument.Load 阶段

我目前面临水晶报告的问题，我们不断收到此错误：

PDF error: Failed to open the connection. Failed to open the connection. 4250901051516FA90CB6FED9F270A2A7 11952_8824_{CD4A46B0-F17C-4675-94B3-5F200A267CCF}.rpt  InnerException: Failed to open the connection. Failed to open the connection. 4250901051516FA90CB6FED9F270A2A7 11952_8824_{CD4A46B0-F17C-4675-94B3-5F200A267CCF}.rpt

从本质上讲，我们已经创建了一个Windows任务计划程序运行的Crystal Reports处理器服务。此服务运行报表，将报表导出为 PDF，将报表作为电子邮件发送，并且还存储在中心位置。

此服务适用于某些报告 - 但是，该服务在调试模式下无法正常工作，并且不断给我们此错误。即使对于似乎正常工作的报告，也发生了此错误。

此异常始终发生在 Export(( 方法阶段结束时。但是，我注意到当 ReportDocument.HasRecords 属性指示内部异常时，此异常会在 ReportDocument.Load(thisCrystalDocument( 上抬起丑陋的头。

我的设置如下：VS2013 Professional、Crystal Reports 2011、Crystal Reports 2011 SP8 Update、SAP Crystal Reports runtime engine for .NET Framework 32 位 (v15( 和 SQL Server 2008 R2 32 位。这不是一个 ASP.NET 项目。

一些代码片段：

public CrystalReportGenerator(string reportLocation, string crystalParameters)
    {
      this.reportDocument = new ReportDocument();
      if (!File.Exists(reportLocation))
      {
        throw new Exception(String.Format("Report at '{0}' does not exist.", reportLocation));
      }
      // Cache report file
      var cacheFolder = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData) + CrystalReportGenerator.cacheSubfolder);
      if (!Directory.Exists(cacheFolder))
      {
        Directory.CreateDirectory(cacheFolder);
      }
      var cachedLocation = Path.Combine(cacheFolder, reportLocation.GetMd5Sum()) + ".rpt";
      if (!File.Exists(cachedLocation))
      {
        File.Copy(reportLocation, cachedLocation, false);
      }
      // Generate report
      this.reportDocument.Load(cachedLocation);
      this.SetParameters(crystalParameters);
      // Override existing database login for report
      this.reportDocument.SetDatabaseLogon(CrystalReportGenerator.sqlUser, CrystalReportGenerator.sqlPassword, CrystalReportGenerator.sqlHost, CrystalReportGenerator.sqlDatabase, false);
      // Override existing database login for subreport(s)
      if (this.reportDocument.Subreports.Count > 0)
      {
        for (int i = 0; i < this.reportDocument.Subreports.Count; i++)
        {
          this.reportDocument.Subreports[i].SetDatabaseLogon(CrystalReportGenerator.sqlUser, CrystalReportGenerator.sqlPassword, CrystalReportGenerator.sqlHost, CrystalReportGenerator.sqlDatabase, false);
        }
      }
    }
private static void GenerateReport(string reportLocation, string reportTitle, string reportParameters, string outputLocation = null, string outputFormat = null, MailMessage message = null)
    {
      var isTempFile = false;
      // Generate report
      using (var generator = new CrystalReportGenerator(reportLocation, reportParameters))
      {
        if (String.IsNullOrWhiteSpace(outputLocation))
        {
          outputLocation = Path.GetTempFileName();
          isTempFile = true;
        }
        else
          outputLocation = outputLocation.ConvertDateTimeReference();
        generator.Export(outputLocation, outputFormat);
        // Send mail message
        if (message != null)
        {
          using (var attachment = new Attachment(outputLocation)
          {
            Name = String.Format("{0}.{1}", reportTitle.ConvertDateTimeReference(), outputFormat.Replace("-DATA", "").ToLower())
          })
          {
            message.Attachments.Add(attachment);
            Emailer.SendMailMessage(message);
          }
        }
        // Clean up temp file
        if (isTempFile && File.Exists(outputLocation))
        {
          File.Delete(outputLocation);
        }
      }
    }
private void Export(string outputLocation, string outputFormat)
    {
      ExportOptions exportOptions = this.reportDocument.ExportOptions;
      exportOptions.ExportDestinationType = ExportDestinationType.DiskFile;
      exportOptions.DestinationOptions = new DiskFileDestinationOptions
      {
        DiskFileName = outputLocation
      };
      switch (outputFormat.ToUpper())
      {
        case "XLS-DATA":
          {
            exportOptions.ExportFormatType = ExportFormatType.ExcelRecord;
            exportOptions.FormatOptions = new ExcelFormatOptions();
            break;
          }
        case "XLS":
        case "XLSX":
          {
            exportOptions.ExportFormatType = ExportFormatType.ExcelWorkbook;
            exportOptions.FormatOptions = new ExcelFormatOptions();
            break;
          }
        case "PDF":
        default:
          {
            exportOptions.ExportFormatType = ExportFormatType.PortableDocFormat;
            exportOptions.FormatOptions = new PdfRtfWordFormatOptions();
            break;
          }
      }
      this.reportDocument.Export();
    }

除此之外，我注意到的另一件事是ReportDocument.HasRecords总是抛出异常。

如果这个问题听起来有点愚蠢，我提前道歉。这是我第一次尝试水晶报告，我非常感谢那些在这方面比我更有经验的人的智慧。谢谢。