[英]Crystal Reports failed to open connection - at ReportDocument.Load stage.
我目前在Crystal Reports方面遇到问题,因此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
本质上,我们已经创建了Windows Task Scheduler运行的Crystal Reports处理器服务。 该服务运行报告,将报告导出为PDF,将PDF报告发送为电子邮件,并存储在中央位置。
该服务对于某些报告可以正常工作-但是,该服务在调试模式下不能很好地工作,并不断向我们显示此错误。 即使对于似乎正常工作的报告,也会发生此错误。
此异常总是发生在Export()方法阶段的末尾。 但是,我注意到,当ReportDocument.HasRecords属性指示内部异常时,此异常将在ReportDocument.Load(thisCrystalDocument)处引起丑陋的印象。
我的设置如下:VS2013 Professional,Crystal Reports 2011,Crystal Reports 2011 SP8更新,用于32位.NET Framework(v15)的SAP Crystal Reports运行时引擎和32位SQL Server 2008 R2。 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总是引发异常。
如果这个问题听起来有点愚蠢,我事先表示歉意。 这是我第一次进行Crystal Reports尝试,我非常感谢那些在这方面比我经验丰富的人的智慧。 谢谢。
在对每个MyReportToRun.rpt文件进行进一步检查之后,我重置了数据库连接字符串并刷新了每个报告,然后再次运行我的应用程序。 事实证明,这很有用,因为它在以后工作了很多。
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