Question

I am using the following code to get exceptions from my MVC Model State:

        IEnumerable<string> exceptions = ModelState (x => x.Value.Errors
                .Where(error => (error != null) &&
                                (error.Exception != null) &&
                                (error.Exception.Message != null))
                .Select(error => error.Exception.Message));

For try-catch block exceptions how could I code a way to take the exception e and make it so my exception and inner exception messages were also put into an IEnumerable like I am doing above?

My problem is that I am not sure how to handle the fact that there could be multiple levels of exceptions.

Not sure if this helps but here’s the code I was using before to put exceptions into a string:

    public static string GetFormattedErrorMessage(this Exception e)
    {
        var exError = "";
        if ( 1 == 1) {
            if (e == null)
            {
                throw new ArgumentNullException("e");
            }

            exError = e.Message;
            if (e.InnerException != null)
            {
                exError += "<br>" + e.InnerException.Message;
                exError += "<br>" + e.StackTrace;
                if (e.InnerException.InnerException != null)
                {
                    exError += "<br>" + e.InnerException.InnerException.Message;
                }
            }
        } else {
            exError = "System error";
        }
        return exError;
    }

Answer 1

You could traverse down the inner exceptions e.g.

public IEnumerable<string> GetErrors(Exception ex)
{
    ...

    var results = new List<string>() { ex.Message };
    var innerEx = ex.InnerException;
    while (innerEx != null) 
    {
        results.Add(innerEx.Message);
        innerEx = innerEx.InnerException;
    }
    return results;
}