ExporttoPDF()失败，提示“数据库登录失败”;错误

在示例控制台应用程序中，我将xml文件读入数据集，将其提供给Crystal Reports，并使用ExportToPDF()方法将报告导出为PDF。我的应用程序失败，出现"数据库登录失败"错误。在MSDN和SCN上发现的类似问题似乎不起作用。

我在日志中得到以下错误和堆栈跟踪:

ConsolePDF Exception: Database logon failed.
ConsolePDF Inner Exception: System.Runtime.InteropServices.COMException (0x8004100F): Database logon failed.
   at CrystalDecisions.ReportAppServer.Controllers.ReportSourceClass.Export(ExportOptions pExportOptions, RequestContext pRequestContext)
   at CrystalDecisions.ReportSource.EromReportSourceBase.ExportToStream(ExportRequestContext reqContext)
ConsolePDF Stack Trace:    at CrystalDecisions.ReportAppServer.ConvertDotNetToErom.ThrowDotNetException(Exception e)
   at CrystalDecisions.ReportSource.EromReportSourceBase.ExportToStream(ExportRequestContext reqContext)
   at CrystalDecisions.CrystalReports.Engine.FormatEngine.ExportToStream(ExportRequestContext reqContext)
   at CrystalDecisions.CrystalReports.Engine.FormatEngine.Export(ExportRequestContext reqContext)
   at CrystalDecisions.CrystalReports.Engine.ReportDocument.ExportToDisk(ExportFormatType formatType, String fileName)
   at ConsolePDF.Program.ConsolePDF() in D:'user'ConsolePDF2'ConsolePDF'Program.cs:line 519

在程序中，我正在读取XML文件，将其加载到数据集中并将其提供给Crystal的报告(.rpt)文件。在report.ExportToDisk(…):

引发异常

try
{
    DataSet ds = new DataSet();
    ds.ReadXml(fileName, XmlReadMode.ReadSchema);
    string pdfFileName = filename + ".pdf";
    ReportDocument report = new ReportDocument();
    String rptLoc = reportLocation.Replace(@"'/", @"'");
    report.Load(rptLoc);
    ds.WriteXml(@"C:'Temp'ReportPDFSOXML.xml", XmlWriteMode.WriteSchema);
    string fullName = fileDir + pdfFileName;
    report.SetDatabaseLogon("user","password","server","database");
    // Next line is 519 - where exception was raised
    report.ExportToDisk(ExportFormatType.PortableDocFormat, fullName);
    report.Close();
    report.Dispose();                               
}
catch (Exception ex)
{
    logger.Info(ex.Message, "ConsolePDF Exception");
    if (ex.InnerException != null)
    {
        logger.Info(ex.InnerException.ToString(), "ConsolePDF Inner Exception");
    }
    if (ex.StackTrace.ToString() != null)
    {
        logger.Info(ex.StackTrace.ToString(), "ConsolePDF Stack Trace");
    }
    connPool.Dispose();
    sessionConn.Dispose();
    Environment.Exit(0);  
}

我能做些什么来消除这个错误?

   //Your Line
   ds.WriteXml(@"C:'Temp'ReportPDFSOXML.xml", XmlWriteMode.WriteSchema);
   //Set the report datasource, using your ds
   report.SetDataSource(ds);