如何测试 AccessViolationException 的处理 [英] How to test handling of AccessViolationException

问题描述

我需要编写一个测试来验证我的代码是否可以处理 AccessViolationException(或任何其他 WIN32 损坏状态异常 - CSE)，该异常发生在不安全的上下文中，通常是通过调用 3rd 方库.这一切都应该在 .net 4.0 上使用 C# 完成.

I need to write a test which verifies that my code can handle an AccessViolationException (or any other WIN32 Corrupted State Exception - CSE), which occours in an unsafe context, typically by calling a 3rd party lib. This should all be done using C# on .net 4.0.

我发现了这个相关问题如何处理 AccessViolationException 和这篇相关文章 http://dotnetslackers.com/articles/net/All-about-Corrupted-State-Exceptions-in-NET4.aspx，解释了如何捕捉这些 CSE 及其背景.

I found this related question How to handle AccessViolationException and this related article http://dotnetslackers.com/articles/net/All-about-Corrupted-State-Exceptions-in-NET4.aspx, which explains how to catch these CSE's and their background.

所以我想在测试中激发一个 WIN32 CSE，以确保在我的应用程序中正确处理.类似的东西:

So i would like to provoke a WIN32 CSE in a test, to ensure correct handling in my application. Something like:

一些要测试的示例类:

public class MyExceptionHandler
{
    [HandleProcessCorruptedStateExceptions]
    public void HandleCorruptedStateException()
    {
        try
        {
             //Force genuine unsafe AccessViolationException
             //not just a throw new AccessViolationException
        }
        catch(Exception e)
        {
             //Log/cleanup/other
        }
    }

    public void DoesNotHandleCorruptedStateException()
    {
        try
        {
             //Force genuine unsafe AccessViolationException
             //not just a throw new AccessViolationException
        }
        catch (Exception e)
        {
            //Log/cleanup/other
        }
    }
}

测试:

class MyTest
{
    [Test]
    public void ShouldVerifyThatAnAccessViolationExceptionIsHandledCorrectly()
    {
        var handler = new MyExceptionHandler();

        Assert.DoesNotThrow(() => handler.HandleCorruptedStateException());
    }

    [Test]
    public void ShouldVerifyThatAnAccessViolationExceptionIsNotHandledCorrectly()
    {
        var handler = new MyExceptionHandler();

        Assert.Throws<AccessViolationException>(() => handler.DoesNotHandleCorruptedStateException());
    }
}

有没有人建议如何在不做太多工作的情况下实现这一目标(例如，编写导致此异常的不安全库).

Does anyone have a suggestion of how to achive this without to much work (ex. writting a unsafe lib which causes this exception).

亲切的问候

更新:为了匹配我的最终解决方案，感谢 JaredPar.

UPDATED: To match my final solution, thanks to JaredPar.

public class MyExceptionHandler
{
    [HandleProcessCorruptedStateExceptions]
    public void HandleCorruptedStateException()
    {
        try
        {
            var ptr = new IntPtr(42);
            Marshal.StructureToPtr(42, ptr, true);
        }
        catch(Exception e)
        {
             //Log/cleanup/other
        }
    }

    public void DoesNotHandleCorruptedStateException()
    {
        try
        {
            var ptr = new IntPtr(42);
            Marshal.StructureToPtr(42, ptr, true);
        }
        catch (Exception e)
        {
            //Log/cleanup/other
        }
    }
}

提示:要手动验证这一点，请使用一个简单的控制台应用程序，从命令行:

TIP: To verify this manually use a simple console app, from the commandline:

class Program
{
    static void Main(string[] args)
    {
        var handler = new MyExceptionHandler();

        if (args.Length > 1)
        {
            handler.HandleCorruptedStateException();
        }
        else
        {
            handler.DoesNotHandleCorruptedStateException();
        }
    }
}

推荐答案

试试下面的

var ptr = new IntPtr(42);
Marshal.StructureToPtr(42, ptr, true);

CLI 规范不保证这会抛出 AccessViolationException，但它会在我知道的每个平台上

This isn't guaranteed to throw an AccessViolationException by the CLI spec but it will on every platform I'm aware of

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