我在窗口服务中使用SharpMap。我正在使用该库生成一个地图，然后从中创建一个图像并将其添加到Excel文件中。代码在Quartz.net任务中运行。
当我调用SharpMap.Map.GetMap()并破坏我的服务时发生错误（请参阅下面的错误报告和堆栈调用）。
这种情况时不时发生（可能是数据问题？）。还要注意，我在处理地图时遇到了一些问题，所以在调用函数之前我就放了一些延迟（System.Threading.Thread.Sleep(5000);）。
我正在生成几个这样的图像，并且错误（上次发生）是在几次（~10次）迭代之后。为了不重新创建和格式化地图的“静态图层”（SharpMap.Map），每次我只添加和删除“动态”图层并在每次迭代中调整一些特征。
有没有办法找出错误的原因？
有没有办法优雅地处理这种异常？
应用程序：NePTune.WinService.exe
框架版本：v4.0.30319
描述：由于未处理的异常，该进程已终止。
异常信息：System.AccessViolationException
堆栈：
at System.Drawing.SafeNativeMethods+Gdip.GdipPathIterNextSubpathPath(System.Runtime.InteropServices.HandleRef, Int32 ByRef, System.Runtime.InteropServices.HandleRef, Boolean ByRef)
at System.Drawing.SafeNativeMethods+Gdip.GdipPathIterNextSubpathPath(System.Runtime.InteropServices.HandleRef, Int32 ByRef, System.Runtime.InteropServices.HandleRef, Boolean ByRef)
at System.Drawing.Drawing2D.GraphicsPathIterator.NextSubpath(System.Drawing.Drawing2D.GraphicsPath, Boolean ByRef)
at SharpMap.Rendering.Symbolizer.WarpPathToPath.Warp(System.Drawing.Drawing2D.GraphicsPath, System.Drawing.Drawing2D.GraphicsPath, Boolean, Single)
at SharpMap.Rendering.Symbolizer.WarpPathToPath.DrawString(System.Drawing.Graphics, System.Drawing.Pen, System.Drawing.Brush, System.String, System.Drawing.FontFamily, Int32, Single, System.Drawing.StringFormat, Boolean, System.Drawing.Drawing2D.GraphicsPath)
at SharpMap.Layers.LabelLayer.Render(System.Drawing.Graphics, SharpMap.Map)
at SharpMap.Map.RenderMap(System.Drawing.Graphics)
at SharpMap.Map.GetMap()
at NePTune.Logic.Algorithms.UlInterference.UlInterferenceReportWriter.CreateClusterMap(System.Collections.Generic.List1<NePTune.Data.SectorGeoDetails>, System.Collections.Generic.Dictionary2<Int32,Double>, Int32, System.Collections.Generic.IEnumerable1<NePTune.Data.SectorGeoDetails>, Boolean)
at NePTune.Logic.Algorithms.UlInterference.UlInterferenceReportWriter.CreateInterferenceClusterWorksheets(OfficeOpenXml.ExcelPackage, System.Collections.Generic.List1<NePTune.Logic.Algorithms.UlInterference.UlInterferenceCluster>, System.Collections.Generic.Dictionary2<Int32,NePTune.Data.SectorGeoDetails>, System.Collections.Generic.Dictionary2<Int32,NePTune.Logic.Algorithms.UlInterference.CellMeasurementList>)
at NePTune.Logic.Algorithms.UlInterference.UlInterferenceReportWriter.CreateReport(System.Collections.Generic.List1<NePTune.Logic.Algorithms.UlInterference.CellUlInterferenceResults>, System.Collections.Generic.List1<NePTune.Logic.Algorithms.UlInterference.UlInterferenceCluster>, System.Collections.Generic.Dictionary2<Int32,NePTune.Data.SectorGeoDetails>, System.Collections.Generic.Dictionary2<Int32,NePTune.Logic.Algorithms.UlInterference.CellMeasurementList>)
at NePTune.Logic.Algorithms.UlInterference.UlInterferenceDriver.Execute(NePTune.Common.Configuration.GlobalConfiguration, NePTune.Logic.Algorithms.UlInterference.UlInterferenceConfiguration)
at NePTune.Logic.Algorithms.AlgorithmJobs.UlInterferenceJob.Execute(NePTune.Common.Configuration.GlobalConfiguration, NePTune.Logic.Algorithms.Common.IAlgorithmConfiguration, System.String, System.String, System.String)
at NePTune.Logic.Algorithms.AlgorithmJobs.UlInterferenceJob.Execute(Quartz.IJobExecutionContext)
at Quartz.Core.JobRunShell.Run()
at Quartz.Simpl.SimpleThreadPool+WorkerThread.Run()
at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
at System.Threading.ThreadHelper.ThreadStart()
答案 0 :(得分：0)
我在CodePlex（https://sharpmap.codeplex.com/）的SharpMap项目页面上讨论过这个问题，然后他们建议在调用地图之前克隆地图。
在添加“动态图层”然后调用GetMap()之前，我稍微更改了代码以在每次迭代中克隆地图。
这可以防止访问冲突。