C# Event.BeginInvoke+;Quartz.NET+;FileSystemWatcher+;Task.runin循环=异常?
我看了这么多,找不到与我的独特问题相匹配的东西 问题是: 我一直在使用Quartz.NET和FileSystemWatcher处理一些代码,基本设置如下 Quartz.NET以15秒的间隔启动计时器。此触发器导致在特定目录中创建文件,文件名格式为*.csv(或*.xml,仅举一个例子)。FileSystemWatcher会注意到该文件并执行一些代码,而这些代码反过来会在同一目录中弹出一个*.csv。现在我知道这将重新触发观察者,它将陷入一个无限循环中——这是我第一次打算这么做 当此代码运行时,我在管理事件的处理程序代码中收到一个越界异常。值得注意的是,在处理Quartz作业和使用for循环时会导致此异常。foreach中不会发生异常 我意识到这段代码可能…很有趣,但有人能解释是什么导致for(范围越界异常)中的额外增量,以及迭代器为什么会成功吗 更新日期:美国东部时间2016年4月14日上午8:05 正如乔恩指出的,这只是一个简单的疏忽和睡眠不足。当任务执行时,i是共享资源C# Event.BeginInvoke+;Quartz.NET+;FileSystemWatcher+;Task.runin循环=异常?,c#,events,asynchronous,multitasking,C#,Events,Asynchronous,Multitasking,我看了这么多,找不到与我的独特问题相匹配的东西 问题是: 我一直在使用Quartz.NET和FileSystemWatcher处理一些代码,基本设置如下 Quartz.NET以15秒的间隔启动计时器。此触发器导致在特定目录中创建文件,文件名格式为*.csv(或*.xml,仅举一个例子)。FileSystemWatcher会注意到该文件并执行一些代码,而这些代码反过来会在同一目录中弹出一个*.csv。现在我知道这将重新触发观察者,它将陷入一个无限循环中——这是我第一次打算这么做 当此代码运行时,我
var tl = new Task[pdList.Count];
for (int i = 0; i < pdList.Count; i++)
{
int li = i; // i is shared...use local copy
// use foreach instead
tl[i] = Task.Factory.StartNew(() => { ExecuteProcess(pdList[li], hargs); }, TaskCreationOptions.LongRunning);
}
var tl=新任务[pdList.Count];
for(int i=0;i{ExecuteProcess(pdList[li],hargs);},TaskCreationOptions.longlunning);
}
更新日期:2016年4月14日美国东部时间上午7:09
根据Jon的指导,我将编写一段较小的代码,希望能够复制这个问题。同时,我添加了stacktrace和异常详细信息。整个项目在github上免费提供,网址为:
例外信息
索引超出范围。必须为非负数且小于
收藏。参数名称:索引
异常堆栈跟踪:
at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
at System.Collections.Generic.List`1.get_Item(Int32 index)
at ThatIntegrationEngine.Engine.<>c__DisplayClass25_1.<BeginProcessExecution>b__0() in Z:\src\ThatIntegrationEngine\ThatIntegrationEngine.Core\Hood\Engine.cs:line 265
at System.Threading.Tasks.Task.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
at System.ThrowHelper.throwargumentotofrangeexception(exception参数,exception资源)
位于System.Collections.Generic.List`1.get_项(Int32索引)
在Z:\src\ThatIntegrationEngine\ThatIntegrationEngine.Core\Hood\Engine.cs中的该IntegrationEngine.Engine.c_uu显示Class25_1.b_u0():第265行
在System.Threading.Tasks.Task.InnerInvoke()中
在System.Threading.Tasks.Task.Execute()中
任务线程内的Stacktrace调用:
at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo)
at System.Environment.get_StackTrace()
at ThatIntegrationEngine.Engine.<>c__DisplayClass25_1.<BeginProcessExecution>b__0() in Z:\src\ThatIntegrationEngine\ThatIntegrationEngine.Core\Hood\Engine.cs:line 263
at System.Threading.Tasks.Task.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
at System.Threading.Tasks.Task.ExecutionContextCallback(Object obj)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot)
at System.Threading.Tasks.Task.ExecuteEntry(Boolean bPreventDoubleExecution)
at System.Threading.Tasks.ThreadPoolTaskScheduler.LongRunningThreadWork(Object obj)
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart(Object obj)
at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo)
at System.Environment.get_StackTrace()
at ThatIntegrationEngine.Engine.<>c__DisplayClass25_1.<BeginProcessExecution>b__0() in Z:\src\ThatIntegrationEngine\ThatIntegrationEngine.Core\Hood\Engine.cs:line 263
at System.Threading.Tasks.Task.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
at System.Threading.Tasks.Task.ExecutionContextCallback(Object obj)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot)
at System.Threading.Tasks.Task.ExecuteEntry(Boolean bPreventDoubleExecution)
at System.Threading.Tasks.ThreadPoolTaskScheduler.LongRunningThreadWork(Object obj)
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart(Object obj)
Exception thrown: 'System.ArgumentOutOfRangeException' in mscorlib.dll
位于System.Environment.GetStackTrace(异常e,布尔needFileInfo)
在System.Environment.get_StackTrace()中
在Z:\src\ThatIntegrationEngine\ThatIntegrationEngine.Core\Hood\Engine.cs中的该IntegrationEngine.Engine.c\u显示Class25\u 1.b\u 0():第263行
在System.Threading.Tasks.Task.InnerInvoke()中
在System.Threading.Tasks.Task.Execute()中
位于System.Threading.Tasks.Task.ExecutionContextCallback(对象obj)
位于System.Threading.ExecutionContext.RunInternal(ExecutionContext ExecutionContext、ContextCallback回调、对象状态、布尔值preserveSyncCtx)
在System.Threading.ExecutionContext.Run(ExecutionContext ExecutionContext,ContextCallback回调,对象状态,布尔保存SyncCTX)
位于System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task和currentTaskSlot)
在System.Threading.Tasks.Task.ExecuteEntry(布尔bPreventDoubleExecution)
位于System.Threading.Tasks.ThreadPoolTaskScheduler.LongRunningThreadWork(对象obj)
位于System.Threading.ThreadHelper.ThreadStart\u上下文(对象状态)
位于System.Threading.ExecutionContext.RunInternal(ExecutionContext ExecutionContext、ContextCallback回调、对象状态、布尔值preserveSyncCtx)
在System.Threading.ExecutionContext.Run(ExecutionContext ExecutionContext,ContextCallback回调,对象状态,布尔保存SyncCTX)
在System.Threading.ExecutionContext.Run(ExecutionContext ExecutionContext,ContextCallback回调,对象状态)
位于System.Threading.ThreadHelper.ThreadStart(对象obj)
位于System.Environment.GetStackTrace(异常e,布尔needFileInfo)
在System.Environment.get_StackTrace()中
在Z:\src\ThatIntegrationEngine\ThatIntegrationEngine.Core\Hood\Engine.cs中的该IntegrationEngine.Engine.c\u显示Class25\u 1.b\u 0():第263行
在System.Threading.Tasks.Task.InnerInvoke()中
在System.Threading.Tasks.Task.Execute()中
位于System.Threading.Tasks.Task.ExecutionContextCallback(对象obj)
位于System.Threading.ExecutionContext.RunInternal(ExecutionContext ExecutionContext、ContextCallback回调、对象状态、布尔值preserveSyncCtx)
在System.Threading.ExecutionContext.Run(ExecutionContext ExecutionContext,ContextCallback回调,对象状态,布尔保存SyncCTX)
位于System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task和currentTaskSlot)
在System.Threading.Tasks.Task.ExecuteEntry(布尔bPreventDoubleExecution)
位于System.Threading.Tasks.ThreadPoolTaskScheduler.LongRunningThreadWork(对象obj)
位于System.Threading.ThreadHelper.ThreadStart\u上下文(对象状态)
位于System.Threading.ExecutionContext.RunInternal(ExecutionContext ExecutionContext、ContextCallback回调、对象状态、布尔值preserveSyncCtx)
在System.Threading.ExecutionContext.Run(ExecutionContext ExecutionContext,ContextCallback回调,对象状态,布尔保存SyncCTX)
在System.Threading.ExecutionContext.Run(ExecutionContext ExecutionContext,ContextCallback回调,对象状态)
位于System.Threading.ThreadHelper.ThreadStart(对象obj)
引发异常:mscorlib.dll中的“System.ArgumentOutOfRangeException”
代码流:
石英触发器触发时引发的事件:
protected virtual void OnTimedActionAsync(object s, CronSchedulerEventArgs e)
{
EventHandler<CronSchedulerEventArgs> handler = TimedActionAsync;
handler?.BeginInvoke(this, e, cs =>
{
var delg = (EventHandler<CronSchedulerEventArgs>)cs.AsyncState;
delg.EndInvoke(cs);
},
handler);
}
受保护的虚拟void OnTimedActionAsync(对象s、CronSchedulerEventArgs e)
{
EventHandler=TimedActionAsync;
处理程序?.BeginInvoke(此,e,c
protected virtual void OnCreatedAsync(object sender, FileSystemEventArgs args)
{
EventHandler<DirWatcherEventArgs> handler = FileArrivedAsync;
handler?.BeginInvoke(this, new DirWatcherEventArgs(args.FullPath, WatcherChangeTypes.Created, Id, Name)
, cs =>
{
var delg = (EventHandler<DirWatcherEventArgs>)cs.AsyncState;
delg.EndInvoke(cs);
}
, handler);
}
private void HandleScheduledActionAsync(object sender, CronSchedulerEventArgs csarg)
{
var scheduler = sender as ICronScheduler;
if (scheduler != null)
{
// load process type based on trigger (sender) id
// dynamically create instance of the process and pass
// all expected information
BeginProcessExecution(csarg);
}
}
private void HandleFileArrivalAsync(object sender, DirWatcherEventArgs dwargs)
{
var watcher = sender as IDirectoryWatcher;
if (watcher != null)
{
// load process type based on trigger (sender) id
// dynamically create instance of the process and pass
// all expected information
BeginProcessExecution(dwargs);
}
}
private void BeginProcessExecution(HandlerEventArgs hargs)
{
IList<IProcessDetails> pdList = null;
if (this._processHandlerRelation.TryGetValue(hargs.TriggerId, out pdList))
{
if (pdList.Count > 1)
{
try
{
//!!! FAILURE !!!
//this fails with out of range exception
var tl = new Task[pdList.Count];
for(int i = 0; i < pdList.Count; i++)
{
//!!! EXCEPTION !!!
// this causes an out of range exception
// at exec task is attempting to read final value of i
// is i accessed by ref? -- no it's a shared resource
tl[i] = Task.Factory.StartNew(() => ExecuteProcess(pdList[i], hargs), TaskCreationOptions.LongRunning);
}
//this does not cause an exception
//var tl = new List<Task>();
//foreach (var pd in pdList)
//{
// tl.Add(Task.Factory.StartNew(() => ExecuteProcess(pd, hargs), TaskCreationOptions.LongRunning));
//}
Task.WaitAll(tl);
// this does not cause an exception
//Parallel.ForEach(pdList, pd => ExecuteProcess(pd, hargs));
}
catch (Exception e)
{
// log exception
}
}
else
{// avoid parallelization if only one process is expected
// to be executed
// execute on calling thread
ExecuteProcess(pdList[0], hargs);
}
}
}
var tl = new Task[pdList.Count];
for (int i = 0; i < pdList.Count; i++)
{
int li = i; // i is shared...use local copy
// use foreach instead
tl[i] = Task.Factory.StartNew(() => ExecuteProcess(pdList[li], hargs), TaskCreationOptions.LongRunning);
}
int pi = 0;
var plist = new Task[pdList.Count];
foreach(var pd in pdList)
{
plist[pi++] = Task.Factory.StartNew(() => ExecuteProcess(pd, hargs), TaskCreationOptions.LongRunning);
}
Task.WaitAll(plist);