Index out of range bug (1)

Error message:

customermessage:999999- System exception. exceptionid:ab4fde6a-d4a6-4ba0-8148-26e494ee8be3data:ttrackid>>  Better.Infrastructures.Log.TrackIDBetter.Infrastructures.Log.AppException: Split analysis anomaly--->  System.ArgumentOutOfRangeException: Index out of range. Must be non-negative and less than the collection size. Parameter name: Index   in System.ThrowHelper.ThrowArgumentOutOfRangeException ()   in System.Collections.Generic.List ' 1 . RemoveAt (Int32 index)   in System.Collections.Generic.List ' 1. Remove (T Item) in Better517Na.InterB2CFirstAnalyzePro.AnalysisProcess.MainProcess.TaskProcess (Object objtask) Location MainProcess.cs: Line number 118---the end of the inner exception stack trace---     

Following the code discovery is the phrase: Dealingtasklist is List<string>,taskid is a string.

Dealingtasklist.remove (TaskID);

There's no problem with it, but the result is a problem, so I'll change to the following

if null && dealingtasklist.exists (sa = sa = = TaskID)) {    dealingtasklist.remove (TaskID);}

The result or error, there is no way, had to remember the log to see if it appears in this place. But halfway I think of them as if it is a thread to do, will not be multi-threaded when there is a problem? So I changed the code to look like this. To prevent the case, I will keep a diary.

 lock   (Lockobj) { if  (dealingtasklist! = null  && dealingtasklist.exists (sa = SA == TaskID) {temp  + =  " [ex Enter]    + =  [ex removal succeeded"   " ;  else   {temp  + =  [ex does not meet the criteria"   " ; }}

So far, no such bug has occurred.

Index out of range bug (1)