EventLog WriteEntry() argumentException error with .net 4.5

Question

since I have migrated my code to .net 4.5, I get errors when I try to write eventLog with eventID > 65535

here is my code where iID is > 65535:

 System.Diagnostics.EventLog appLog = new System.Diagnostics.EventLog();
 appLog.Source = "my source";
 appLog.WriteEntry(sMsg, EventLogEntryType.Error, iID);

based on the definition the eventID is well a int32 so I don't understand why I get error there.

here the stack trace:

   at System.Diagnostics.EventLogInternal.WriteEntry(String message, EventLogEntryType type, Int32 eventID, Int16 category, Byte[] rawData)
   at System.Diagnostics.EventLog.WriteEntry(String message, EventLogEntryType type, Int32 eventID)
   at WSeProcFilesHandler.EventLog_AddEntry(String sMsg, Int32 iID) in d:\Liox\TFS\Eprocurement\Main\Dev\Eprocurement\Services\WAeProcFilesHandler\WSeProcFilesHandler.cs:line 567

any help will be welcomed. thanks

Raphaël Althaus · Accepted Answer · 2014-01-08 13:51:39Z

1

Well, that's stated in msdn

ArgumentException

or - eventID is less than zero or greater than UInt16.MaxValue.

No explanation why an Int32 parameter is limited to an UInt16, to be honest...

A way to manage this would be to use eventlogs categories (see this overload). So you might have 65536 ids for each category.

By the way, that's a lot of distinct eventlog ids, no ?

edited Jan 8, 2014 at 13:51

answered Jan 8, 2014 at 13:15

Raphaël Althaus

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4 Comments

Denfer06 Over a year ago

it's what I saw but like you I don't understand why it's limited to UInt16.MaxValue. Is there any way to increase this size ?

Denfer06 Over a year ago

I will use a fix eventID and move the iID intto the sMsg string. thanks for your help

Raphaël Althaus Over a year ago

@Denfer06 yes, the eventID should be something like a "type of event", not a sort of autoincremental number.

TilleyTech Over a year ago

Hi thanks yes I'd followed a tutorial on creating a service and have a method called GetEventId() that was just incrementing. This just caught me out too (weird as this is an x64 app?!). Anyway, as you say, high amount of distinct IDs and I can just assign an ID for each module that calls to write an update to the log.

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