打印到本地打印機時出現錯誤

Question

我的用戶希望能夠直接打印我在VS 2010中設計的報告，而不是通過預覽報告的過程。我在VS 2010中設計了報告，使用那裏的報告設計器創建了一個.rdlc文件。我用下面的MSDN演練作爲一個例子，我的代碼：

http://msdn.microsoft.com/en-us/library/ms252091(v=VS.80).aspx

在我的情況，而不是數據在XML文件之中，我從一個SQL Server數據庫中檢索數據，並我有一個.xsd文件等。另外，我將參數傳遞給報告。將傳遞的數據集和ReportParameters分配給報表似乎沒問題。下面的代碼的片段，最後一行是發生錯誤行：

string deviceInfo =
"<DeviceInfo>" +
" <OutputFormat>EMF</OutputFormat>" +
" <PageWidth>8.5in</PageWidth>" +
" <PageHeight>11in</PageHeight>" +
" <MarginTop>0.4in</MarginTop>" +
" <MarginLeft>0.5in</MarginLeft>" +
" <MarginRight>0.5in</MarginRight>" +
" <MarginBottom>0.4in</MarginBottom>" +
"</DeviceInfo>";
Warning[] warnings;
m_streams = new List<Stream>();
report.Render("Image", deviceInfo, CreateStream, out warnings);

和這裏的錯誤消息我得到：

 
Microsoft.Reporting.WinForms.LocalProcessingException was unhandled 
    Message=An error occurred during local report processing. 
    Source=Microsoft.ReportViewer.WinForms 
    StackTrace: 
     at Microsoft.Reporting.WinForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, PageCountMode pageCountMode, CreateAndRegisterStream createStreamCallback, Warning[]& warnings) 
     at Microsoft.Reporting.WinForms.LocalReport.Render(String format, String deviceInfo, PageCountMode pageCountMode, CreateStreamCallback createStream, Warning[]& warnings) 
     at Microsoft.Reporting.WinForms.LocalReport.Render(String format, String deviceInfo, CreateStreamCallback createStream, Warning[]& warnings) 
     at SimpleWinForms.PrintRfsDirectly.Export(LocalReport report) in C:\Users\Rodf\Documents\Visual Studio 2010\Projects\SimpleWinForms\SimpleWinForms\PrintRfsDirectly.cs:line 62 
     at SimpleWinForms.PrintRfsDirectly..ctor(spRequestForServicesReport2DataTable RfsTable, ReportParameter AmciName, ReportParameter ClientNumberParameter, ReportParameter CaseNumberParameter, ReportParameter ClientNameParameter, String RdlcFileName) in C:\Users\Rodf\Documents\Visual Studio 2010\Projects\SimpleWinForms\SimpleWinForms\PrintRfsDirectly.cs:line 35 
     at SimpleWinForms.ShowReport.ShowReport_Load(Object sender, EventArgs e) in C:\Users\Rodf\Documents\Visual Studio 2010\Projects\SimpleWinForms\SimpleWinForms\ShowReport.cs:line 54 
     at System.Windows.Forms.Form.OnLoad(EventArgs e) 
     at System.Windows.Forms.Form.OnCreateControl() 
     at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible) 
     at System.Windows.Forms.Control.CreateControl() 
     at System.Windows.Forms.Control.WmShowWindow(Message& m) 
     at System.Windows.Forms.Control.WndProc(Message& m) 
     at System.Windows.Forms.ScrollableControl.WndProc(Message& m) 
     at System.Windows.Forms.Form.WmShowWindow(Message& m) 
     at System.Windows.Forms.Form.WndProc(Message& m) 
     at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) 
     at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) 
     at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) 
     at System.Windows.Forms.SafeNativeMethods.ShowWindow(HandleRef hWnd, Int32 nCmdShow) 
     at System.Windows.Forms.Control.SetVisibleCore(Boolean value) 
     at System.Windows.Forms.Form.SetVisibleCore(Boolean value) 
     at System.Windows.Forms.Control.Show() 
     at SimpleWinForms.Form1.btnPrintRFS_Click(Object sender, EventArgs e) in C:\Users\Rodf\Documents\Visual Studio 2010\Projects\SimpleWinForms\SimpleWinForms\Form1.cs:line 55 
     at System.Windows.Forms.Control.OnClick(EventArgs e) 
     at System.Windows.Forms.Button.OnClick(EventArgs e) 
     at System.Windows.Forms.Button.PerformClick() 
     at System.Windows.Forms.Form.ProcessDialogKey(Keys keyData) 
     at System.Windows.Forms.Control.ProcessDialogKey(Keys keyData) 
     at System.Windows.Forms.Control.PreProcessMessage(Message& msg) 
     at System.Windows.Forms.Control.PreProcessControlMessageInternal(Control target, Message& msg) 
     at System.Windows.Forms.Application.ThreadContext.PreTranslateMessage(MSG& msg) 
     at System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FPreTranslateMessage(MSG& msg) 
     at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData) 
     at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) 
     at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) 
     at System.Windows.Forms.Application.Run(Form mainForm) 
     at SimpleWinForms.Program.Main() in c:\users\rodf\documents\visual studio 2010\Projects\SimpleWinForms\SimpleWinForms\Program.cs:line 18 
     at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) 
     at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) 
     at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() 
     at System.Threading.ThreadHelper.ThreadStart_Context(Object state) 
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) 
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) 
     at System.Threading.ThreadHelper.ThreadStart() 
    InnerException: Microsoft.ReportingServices.ReportProcessing.ProcessingAbortedException 
     Message=An error has occurred during report processing. 
     Source=Microsoft.ReportViewer.Common 
     ExceptionLevelHelpLink=http://go.microsoft.com/fwlink/?LinkId=20476&EvtSrc=Microsoft.ReportingServices.Diagnostics.Utilities.ErrorStrings&EvtID=rsProcessingAborted&ProdName=Microsoft%20SQL%20Server%20Reporting%20Services&ProdVer=1.0 
     SkipTopLevelMessage=false 
     StackTrace: 
      at Microsoft.ReportingServices.OnDemandProcessing.OnDemandProcessingContext.AbortHelper.ThrowAbortException(String reportUniqueName) 
      at Microsoft.ReportingServices.OnDemandProcessing.OnDemandProcessingContext.CheckAndThrowIfAborted() 
      at Microsoft.ReportingServices.OnDemandProcessing.RetrievalManager.FetchData(Boolean mergeTran) 
      at Microsoft.ReportingServices.OnDemandProcessing.RetrievalManager.PrefetchData(ReportInstance reportInstance, ParameterInfoCollection parameters, Boolean mergeTran) 
      at Microsoft.ReportingServices.OnDemandProcessing.Merge.FetchData(ReportInstance reportInstance, Boolean mergeTransaction) 
      at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.ProcessOdpReport(Report report, OnDemandMetadata odpMetadataFromSnapshot, ProcessingContext pc, Boolean snapshotProcessing, Boolean reprocessSnapshot, Boolean processUserSortFilterEvent, Boolean processWithCachedData, ErrorContext errorContext, DateTime executionTime, IChunkFactory cacheDataChunkFactory, StoreServerParameters storeServerParameters, GlobalIDOwnerCollection globalIDOwnerCollection, SortFilterEventInfoMap oldUserSortInformation, EventInformation newUserSortInformation, String oldUserSortEventSourceUniqueName, ExecutionLogContext executionLogContext, OnDemandProcessingContext& odpContext) 
      at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RenderReport(IRenderingExtension newRenderer, DateTime executionTimeStamp, ProcessingContext pc, RenderingContext rc, IChunkFactory cacheDataChunkFactory, IChunkFactory yukonCompiledDefinition, Boolean& dataCached) 
      at Microsoft.Reporting.LocalService.CreateSnapshotAndRender(CatalogItemContextBase itemContext, ReportProcessing repProc, IRenderingExtension renderer, ProcessingContext pc, RenderingContext rc, SubreportCallbackHandler subreportHandler, ParameterInfoCollection parameters, DatasourceCredentialsCollection credentials) 
      at Microsoft.Reporting.LocalService.Render(CatalogItemContextBase itemContext, Boolean allowInternalRenderers, ParameterInfoCollection reportParameters, IEnumerable dataSources, DatasourceCredentialsCollection credentials, CreateAndRegisterStream createStreamCallback, ReportRuntimeSetup runtimeSetup) 
      at Microsoft.Reporting.WinForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, PageCountMode pageCountMode, CreateAndRegisterStream createStreamCallback, Warning[]& warnings) 
     InnerException: Microsoft.ReportingServices.ReportProcessing.ReportProcessingException 
      Message=RfsDataSet 
      Source=Microsoft.ReportViewer.Common 
      ExceptionLevelHelpLink=http://go.microsoft.com/fwlink/?LinkId=20476&EvtSrc=Microsoft.ReportingServices.Diagnostics.Utilities.ErrorStrings&EvtID=rsErrorCreatingDataReader&ProdName=Microsoft%20SQL%20Server%20Reporting%20Services&ProdVer=1.0 
      SkipTopLevelMessage=false 
      StackTrace: 
       at Microsoft.ReportingServices.OnDemandProcessing.RuntimeDataSet.RunDataSetQuery() 
       at Microsoft.ReportingServices.OnDemandProcessing.TablixProcessing.RuntimeOnDemandDataSet.Process() 
       at Microsoft.ReportingServices.OnDemandProcessing.RuntimeDataSet.ProcessConcurrent(Object threadSet) 
      InnerException: 

Answer 1

我碰到這個錯誤之際，並且在運行render方法時最終將它追蹤到在CreateStream回調中創建文件流的權限問題。在創建文件流時，會引發訪問異常。簡單地用一個唯一的臨時名稱替換靜態文件名以解決問題：

// Routine to provide to the report renderer, in order to save an image for each page of the report. 
    private Stream CreateStream(string name, string fileNameExtension, Encoding encoding, 
     string mimeType, bool willSeek) 
    {    
     Stream stream = new FileStream(Path.GetTempFileName(), FileMode.Create);    
     m_streams.Add(stream); 
     return stream; 
    }