Question

I have the following code snippets.

protected IEnumerable<string> GetErrorsFromModelState()
{
    var errors =  ModelState.SelectMany(x => x.Value.Errors
            .Select(error => error.ErrorMessage));
    return errors;
}

protected IEnumerable<string> GetErrorsFromModelState()
{
    var exceptions = ModelState.SelectMany(x => x.Value.Errors
            .Select(error => error.Exception));
    return exceptions;
}

Is there a way that I could combine these two so that GetErrorsFromModelState will return all the ErrorMessage and Exception values?

Answer 1

Sure – use the Enumerable.Union extension method

protected IEnumerable<string> GetErrorsAndExceptionsFromModelState()
{
    var errors = ModelState
                    .SelectMany(x => x.Value.Errors.Select(error => error.ErrorMessage)
                    .Union(x.Value.Errors.Select(error => error.Exception.Message)));
    return errors;
}