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Resolved Limitation with .NET exception handling and LDAP in Appeon PowerBuilder 2022 R3 (classic type).
  1. New
  2. Issue
  3.  .NET Assembly
  4.  .NET Core Framework
  5.  .NET Std Framework
  6.  32-bit
  7.  Architecture
  8.  Authentication
  9.  External Functions
  10.  PB.NET
  11.  PowerBuilder (Appeon)
  12.  PowerBuilder Runtime
0 Votes
  1. Shashank S
  2. PowerBuilder
  3. Tuesday, 10 March 2026 09:10 AM UTC

While reviewing some of the available documentation, I could not find clear guidance on the following scenario, so I am reaching out here for clarification.

We are migrating an application from PowerBuilder WinForms target (Sybase IDE – 12.5.2) to Appeon PowerBuilder 2022 R3 (Classic).

The application calls a .NET DLL built with .NET Framework 4.8.

  • Issue 1 – Exception handling

In Sybase PowerBuilder 12.5.2 we were able to catch exceptions thrown from the .NET DLL:

TRY
   // call external DLL
CATCH (System.Exception ex)
   MessageBox("Error", ex.Message)
END TRY

In Appeon Classic, System.Exception does not appear to be supported.

If the DLL throws an exception (even for business validation), we only get:

“Runtime exception error calling external function”

The original exception message is not available.

Question:
What is the recommended way to return error messages from a .NET DLL to PowerBuilder in Appeon Classic?

 

  • Issue 2 – LDAP authentication

The same DLL contains LDAP authentication code using:

System.DirectoryServices.Protocols

When this code runs from Appeon, we get:

“System.DirectoryServices.Protocols is not supported on this platform.”
(This message was captured from within the .NET DLL by adding logging inside the called dll function.)

Question:
Is System.DirectoryServices.Protocols supported when calling a .NET Framework4.8 DLL from Appeon Classic? If not, what is the recommended approach for LDAP authentication?


Thanks in advance 

Regards.

Export to Excel12 in PB2025, file not created Recommendations to upgrade PB2025 GA
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