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Dynamics 365 Community / Forums / Microsoft Dynamics AX (Archived) / Get thrown .NET object...
Microsoft Dynamics AX (Archived)
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Get thrown .NET object on error

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Posted on by Luke Shuttlewood 175

Hi,

When catching a CLR error, is it possible to get the .NET object that is thrown?

For example "System.Net.HttpWebRequest" throws "System.Net.WebException" when the HTTP status not 200.

How can I get the System.Net.WebException object in X++?

In C# it would be as simple as this: https://stackoverflow.com/questions/3614034/system-net-webexception-http-status-code.

By that syntax does not exist in X++.

Any ideas?

Luke

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  • Verified answer
    Martin Dráb Profile Picture
    Martin Dráb 239,747 Most Valuable Professional on at

    Yes, it is. The first step is calling CLRInterop::getLastException() to get the exception. But one more step is needed. Because .NET Interop from X++ uses reflection to call .NET code, the original exception is wrapped in a TargetInvocationException. You need to get its inner exception.

    try
{
    ...
}
catch (Exception::CLRError)
{
    invocationException = CLRInterop::getLastException();
    invocationException.get_InnerException(); // this will give you the original exception
}
  • Community Member Profile Picture
    Community Member on at

    Hi Martin,

    It won't help, I tested in AX 2012 environment, there's no exception thrown. The class exited at the line I expected an exception

    your method works with other .net class but not this System.Net.WebException.

    I tried to replicate the class in C# and received System.Net.WebException: 'The remote server returned an error: (404) Not Found.'

    but there's nothing in AX

  • Martin Dráb Profile Picture
    Martin Dráb 239,747 Most Valuable Professional on at

    I don't believe that. I don't see any reason why WebException would behave differently.

    Make sure that you're testing it in the right context. I guess that you code runs inside a transaction, therefore you catch statement is completely ignored.

  • Community Member Profile Picture
    Community Member on at

    hi Martin,

    there's a similar case

    community.dynamics.com/.../753199

    hope that you believe now!

  • Martin Dráb Profile Picture
    Martin Dráb 239,747 Most Valuable Professional on at

    The verified answer of the other tread says that it indeed was caused by a transaction. So you either have your answer, or your case isn't the same.

  • Community Member Profile Picture
    Community Member on at

    hi Martin,

    there's no transaction (no ttsbegin) in my code.

    I finally found that the error was caused by calling webrequest in an environment that requires webproxy.

  • Martin Dráb Profile Picture
    Martin Dráb 239,747 Most Valuable Professional on at

    I wasn't talking about ttsBegin in your code. Most likely your complete code was executed inside a transaction started at a higher level.

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