1 foreach (ReportDataSource rds in rdss)
 2 {
 3     MyReportViewer.LocalReport.DataSources.Add(rds);
 4 }
 5 MyReportViewer.LocalReport.SetParameters(rpList);
 6 MyReportViewer.LocalReport.Refresh();
 7 
 8 Warning[] warnings;
 9  string[] streamids;
10  string mimeType;
11  string encoding;
12 string extension;
13 
14 byte[] bytes = MyReportViewer.LocalReport.Render(
15     "Excel", null, out mimeType, out encoding, out extension,
16     out streamids, out warnings);
17 System.IO.Directory.CreateDirectory(excelPath + "\\" + DateTime.Now.ToString("yyyyMMdd"));
18 FileStream fs =
19     new FileStream(excelPath + "\\" + DateTime.Now.ToString("yyyyMMdd") + "\\" + Category + ".xls",
20                    FileMode.Create);
21 fs.Write(bytes, 0, bytes.Length);
22 fs.Close();

An error occurred during local report processing.
Microsoft.Reporting.WebForms.LocalProcessingException: An error occurred during local report processing. ---> Microsoft.ReportingServices.ReportProcessing.ProcessingAbortedException: An error has occurred during report processing. ---> System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at System.Collections.Generic.List`1.Add(T item)
   at Microsoft.ReportingServices.Library.MemoryReportSnapshot.CreateReportChunk(String name, ReportChunkTypes type, String mimeType)
   at Microsoft.ReportingServices.ReportProcessing.ChunkManager.DataChunkWriter.Flush()
   at Microsoft.ReportingServices.ReportProcessing.ChunkManager.DataChunkWriter.FinalFlush()
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RuntimeReportDataSetNode.FirstPassCleanup(Boolean flushData)
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RuntimeDataSetNode.FirstPass()
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RuntimeDataSetNode.FirstPassProcess(Boolean& closeConnWhenFinish)
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RuntimeReportDataSetNode.Process()
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RuntimeDataSetNode.ProcessConcurrent(Object threadSet)
   --- End of inner exception stack trace ---
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.ProcessingContext.AbortHelper.ThrowAbortException(Int32 reportUniqueName)
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.ProcessingContext.CheckAndThrowIfAborted()
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.Merge.Process(ParameterInfoCollection parameters, Boolean mergeTran)
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.ProcessReport(Report report, ProcessingContext pc, ProcessingContext context)
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.ProcessReport(Report report, ProcessingContext pc, Boolean snapshotProcessing, Boolean processWithCachedData, GetReportChunk getChunkCallback, ErrorContext errorContext, DateTime executionTime, CreateReportChunk cacheDataCallback, ProcessingContext& context)
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RenderReport(IRenderingExtension renderer, DateTime executionTimeStamp, GetReportChunk getCompiledDefinitionCallback, ProcessingContext pc, RenderingContext rc, CreateReportChunk cacheDataCallback, Boolean& dataCached)
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RenderReport(IRenderingExtension renderer, DateTime executionTimeStamp, GetReportChunk getCompiledDefinitionCallback, ProcessingContext pc, RenderingContext rc)
   at Microsoft.Reporting.LocalService.RenderWithDataCache(PreviewItemContext itemContext, ParameterInfoCollection reportParameters, IEnumerable dataSources, DatasourceCredentialsCollection credentials, IRenderingExtension renderer, ReportProcessing repProc, CreateAndRegisterStream createStreamCallback, ReportRuntimeSetup runtimeSetup)
   at Microsoft.Reporting.LocalService.Render(PreviewItemContext itemContext, Boolean allowInternalRenderers, ParameterInfoCollection reportParameters, IEnumerable dataSources, DatasourceCredentialsCollection credentials, CreateAndRegisterStream createStreamCallback, ReportRuntimeSetup runtimeSetup, ProcessingMessageList& warnings)
   at Microsoft.Reporting.WebForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, CreateAndRegisterStream createStreamCallback, Warning[]& warnings)
   --- End of inner exception stack trace ---
   at Microsoft.Reporting.WebForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, CreateAndRegisterStream createStreamCallback, Warning[]& warnings)
   at Microsoft.Reporting.WebForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, String& mimeType, String& encoding, String& fileNameExtension, String[]& streams, Warning[]& warnings)
   at Microsoft.Reporting.WebForms.LocalReport.Render(String format, String deviceInfo, String& mimeType, String& encoding, String& fileNameExtension, String[]& streams, Warning[]& warnings)
   at TimeTask.Service.ReportManager.AnalyzedService.AnalyzedToExcel(String excelPath, String beginDate, String endDate) in E:\TimeTask\TimeTask.Service\ReportManager\AnalyzedService.cs:line 399