How Do I Handle AccessViolationExceptions in .NET When Using COM Objects?

Addressing AccessViolationExceptions When Interacting with COM Objects in .NET

.NET applications utilizing COM objects may encounter AccessViolationExceptions. Even with try-catch blocks, these exceptions might not be caught, leading to debugger breaks during method calls. This behavior stems from .NET 4.0's Corrupted State Exceptions (CSE) mechanism. Microsoft's CLR team advises against attempting to handle CSEs in managed code, as they signify a compromised process state. AccessViolationException falls under the CSE category.

Here are several approaches to manage this situation:

1. Target .NET Framework 3.5: Recompile your application for the .NET Framework 3.5 and execute it within the .NET 4.0 environment.

2. Modify Application Configuration: Include the following entry in your application's configuration file (.config):

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

Setting enabled="true" enables the legacy behavior of catching these exceptions.

3. Employ the HandleProcessCorruptedStateExceptions Attribute: Annotate the methods susceptible to these exceptions with the HandleProcessCorruptedStateExceptions attribute:

<code class="language-csharp">[HandleProcessCorruptedStateExceptions]
public void MyComMethod() { ... }</code>

By implementing one of these solutions, you can effectively capture and handle AccessViolationExceptions arising from COM object interactions.

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