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Can string manipulation function produce a CLR issue ?

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Posted on by Teevo

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Hi all,

I wondering whether some string function, for example strRFix() can cause a CLR error in D365 FO ?

Reason is my F&O currently crashing and have this error /

/An exception occurred when invoking the operation - Common Language Runtime detected an invalid program.

And the least I can remember of some changes in my code is I'm adding this kind of statement in my code ->

System.DateTime localDateTime = DateTimeUtil::applyTimeZoneOffset(System.DateTime::Now, DateTimeUtil::getUserPreferredTimeZone());
TimeInMS timeMS = System.DateTimeOffset::Now.Millisecond;

myString = strFmt(/%1%2/,localDateTime.ToString('yyyyMMdd_HHmmss'), strRFix(int2str(timeMS), 4, /0/))

Thanks

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Layan Jwei 8,165 Super User 2026 Season 1 on at

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Hi Teevo,

On what line is it failing, did u debug?

And in general you can use this to catch most of exceptions

system.Exception ex;

Try

{

}

catch(ex)

{

}

Also what version is your Visual studio?

Thanks,

Layan Jweihan

Please mark this answer as "Verified" if it solved your issue. In order to help others who will face a similar issue in the future

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Teevo 403 on at

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Hi Layan,

This is actually relate to my other post about custom API failing. https://community.dynamics.com/forums/thread/details/?threadid=7e89dfde-0206-ef11-9f89-0022482005ec

So basically, I have the mentioned error and what I did was add those lines in my custom API.

However I'm not too sure that this statement is the cause, because I tried this code in my local DevBox, as well as changing the DB to UAT and it is fine.

My Visual Studio is 2019 version. I debug this and found no issue actually. but since the error message not giving me any clue what is the error, I tried to think from many aspect and thinking whether the CLR error because of my addition.

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Waed Ayyad 9,066 Super User 2026 Season 1 on at

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Hi,

Try to add this code and debug it. Also add it to your API and try to call it.

System.Exception e; InteropPermission interopPermission; try { interopPermission = new InteropPermission(InteropKind::ComInterop); interopPermission.assert(); //Your code here } catch (Exception::CLRError) { e = CLRInterop::getLastException(); if (e != null) { e = e.InnerException; throw error(e.ToString()); //…or whatever you want to do with that error text } else { throw error("null CLR error"); } } catch { //other error handling } finally { CodeAccessPermission::revertAssert(); }

Thanks,
Waed Ayyad

If this helped, please mark it as "Verified" for others facing the same issue

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Teevo 403 on at

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Hi,

I can confirm now, the strRFix() function is the root cause of my CLR error.

And this only happened in my custom API running in Multitier environment.

Anyone know why this string function cannot run in Multitier ?

Thanks

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Martin Dráb 238,751 Most Valuable Professional on at

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What values did you pass to strRFix() and what exception did you get?

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Teevo 403 on at

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Hi Martin,

The strRFix is in this code :

System.DateTime localDateTime = DateTimeUtil::applyTimeZoneOffset(System.DateTime::Now, DateTimeUtil::getUserPreferredTimeZone());
TimeInMS timeMS = System.DateTimeOffset::Now.Millisecond;

myString = strFmt(/%1%2/,localDateTime.ToString('yyyyMMdd_HHmmss'), strRFix(int2str(timeMS), 4, /0/))

So when I remove that strRFix, the error is gone.

As mentioned, this only happened when I run it against my Tier-2 environment. It does not happen in my DevBox.

I tried to add Try..Catch() and put the error in my log table, however it looks like it won't catch as well, so not sure whether it is CLR error, although postman says so.

try { System.DateTime localDateTime = DateTimeUtil::applyTimeZoneOffset(System.DateTime::Now, DateTimeUtil::getUserPreferredTimeZone()); TimeInMS timeMS = System.DateTimeOffset::Now.Millisecond; ttsbegin; logTable.clear(); logTable.ID = strFmt("%1%2",localDateTime.ToString('yyyyMMdd_HHmmss'), strRFix(int2str(timeMS), 4, "0")); str logId = logTable.ID; . . logTable.insert(); ttscommit; } catch (Exception::CLRError) { System.Exception e; e = CLRInterop::getLastException(); if (e != null) { e = e.InnerException; ttsbegin; logTable.clear(); logTable.ID = strFmt("%1%2",systemDateGet(), "0000"); logTable.Response = e.ToString(); logTable.insert(); ttscommit; }

Hope my explanation is clear.

Thanks.

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Martin Dráb 238,751 Most Valuable Professional on at

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The fact that you're getting an exception when using strRFix() doesn't necessarily mean that it's thrown by strRFix(). You do many things at the single line and then it's not clear where exactly it failed.

Instead of trying to identify the exact reason (without having enough information about the exception and the data), let me suggest more sensible code:

System.DateTime utcTimeNow = System.DateTime::Now; System.DateTime localDateTime = DateTimeUtil::applyTimeZoneOffset(utcTimeNow, DateTimeUtil::getUserPreferredTimeZone()); int timeMS = utcTimeNow.Millisecond; localDateTime.AddMilliseconds(timeMS); myString = localDateTime.ToString('yyyyMMdd_HHmmssffff');

By the way, there is an easier way of catching CLR exceptions:

System.Exception ex; try { ... } catch (ex) { ... }

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Teevo 403 on at

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Hi Martin,

Actually that strRFix() is a new addition. Before this addition, the code is already running well, like this ->

myString = strFmt(/%1%2/,localDateTime.ToString('yyyyMMdd_HHmmss'), timeMS)

It is only that I don't need the full timeMS which if I remembered correctly it is 7 digit, so I cut into 4, but I want it to be aligned.

Come to think maybe I try it in separation first.

But if there is some more suggestion, I'm happy to know.

Thanks.

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Martin Dráb 238,751 Most Valuable Professional on at

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My suggestion is in my previous reply. Instead of formatting the date time by one way and the milliseconds in another way, I simply added milliseconds to the string format (yyyyMMdd_HHmmssffff instead of yyyyMMdd_HHmmss). It's more straightforward and it doesn't use any int2str() and strRFix() at all.

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Teevo 403 on at

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Hi Martin,

If I remember correctly that format yyyyMMdd_HHmmssffff is not working. Someone also mentioned that D365 function DateTimeUtil is not support until millisecond.

Let me try again. Since the splitting is not working.

May I know also how exactly the catch, because I follow what stated here, just a few modification because I want to catch the error in log table.

Here is the code:

System.Exception ex; try { System.DateTime localDateTime = DateTimeUtil::applyTimeZoneOffset(System.DateTime::Now, DateTimeUtil::getUserPreferredTimeZone()); TimeInMS timeMS = System.DateTimeOffset::Now.Millisecond; ttsbegin; logTable.clear(); str s1_timeMS = int2Str(timeMS); str s2_timeMS = subStr(s1_timeMS,strLen(s1_timeMS)-4, strLen(s1_timeMS)); str s3_timeMS = strRFix(s2_timeMS, 4, "0"); logTable.ID = strFmt("%1%2",localDateTime.ToString('yyyyMMdd_HHmmss'), s3_timeMS); logTable.insert(); ttscommit; } catch(ex) { str exMessage = ex.Message; ttsbegin; logTable.clear(); logTable.ID = strFmt("%1%2",systemDateGet(), "0000"); logTable.Response = exMessage; logTable.insert(); ttscommit; }

May I know how exactly to catch this error in multi-tier ?

Because with that code, turns out it is not catch (not insert into my log)

Actually the intention here is I want to have ID, and to eliminate the chance to have duplicate ID, I would like to have that numbers up to millisecond, because this is a batchjob, can be fast so if the ID only up to second, there is chance to have same ID.

Thanks

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