How Can I Handle System.AccessViolationExceptions in .NET Applications?

System.AccessViolationException exception handling

System.AccessViolationException exceptions are often encountered when using COM objects in .NET applications. Typically, however, this exception is intercepted by the debugger, blocking program execution and preventing the implemented catch block from being executed.

This issue occurs because of the way .NET Framework 4.0 handles exceptions through Windows Structured Exception Handling (SEH). Certain exceptions, such as AccessViolationExceptions, are considered corrupted state exceptions (CSEs), and because they indicate state corruption, they cannot be caught by standard managed code.

Despite this limitation, there are some workarounds to enable CSE processing:

1. Downgrade to .NET 3.5: Recompile the application into a .NET 3.5 assembly and execute it in the .NET 4.0 runtime.

2. Modify the application configuration: Add the following line under the runtime element of the configuration file:

   <code class="language-xml"> <legacycorruptedstateexceptionspolicy enabled="true"></legacycorruptedstateexceptionspolicy></code>

3. Use attribute decoration: Use the HandleProcessCorruptedStateExceptions attribute to decorate the method in which you intend to catch CSE.

For more information about CSE, please see the following resources:

• CSE in .NET 4.0 Framework

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