---
title: "Codeunit 1291 DotNet Exception Handler"
author: "Jonas Paprotka"
url: https://jonas-paprotka.de/ref/codeunit/1291-dotnet-exception-handler/
type: codeunit
id: 1291
name: "DotNet Exception Handler"
app: "Base Application"
namespace: System.Utilities
versions: "17-28"
build: 28.5.54151.54365
source: "https://jonas-paprotka.de/ref/codeunit/1291-dotnet-exception-handler/source/29/"
checked: 2026-09-20
subject: "Microsoft Dynamics 365 Business Central"
license: "Content © 2026 Jonas Paprotka. Quote freely with attribution and a link."
---

# Codeunit 1291 DotNet Exception Handler

Jonas Paprotka, https://jonas-paprotka.de/ref/codeunit/1291-dotnet-exception-handler/

| | |
| --- | --- |
| App | Base Application |
| Namespace | System.Utilities |
| Versions | 17-28 |
| Source file | Modules/System/ExceptionHandling/DotNetExceptionHandler.Codeunit.al |

## Procedures

| Name | Parameters | Returns | Access | Versions | Obsolete | Reason |
| --- | --- | --- | --- | --- | --- | --- |
| Catch | (var DotNet Exception, DotNet Type) | - | public | 17-28 | - | - |
| Collect | () | - | public | 17-28 | - | - |
| TryCastToType | (DotNet Type) | Boolean | public | 17-28 | - | - |
| CastToType | (var DotNet Exception, DotNet Type) | Boolean | public | 17-28 | - | - |
| GetMessage | () | Text | public | 17-28 | - | - |
| Rethrow | () | - | public | 17-28 | - | - |

## Source

Symbols: Microsoft.BaseApplication.symbols.437dbf0e-84ff-417a-965d-ed2bb9650972, https://dynamicssmb2.pkgs.visualstudio.com/DynamicsBCPublicFeeds/_packaging/MSSymbols/nuget/v3/index.json, highest build per major on 2026-09-20.
AL source 29: https://github.com/microsoft/BCApps, MIT, releases/29.x at a66254c3b8b5bb1cea290dc8f9d097aec4381153.

Jonas Paprotka, 2026-09-20.