Ajax continuation failures

AjaxContinuationExtensions.cs

public static AjaxContinuation SystemFailure(this AjaxContinuation continuation, Exception exception)
{
	continuation.Success = false;
	continuation[EXCEPTION] = new AjaxException
	{
		type = exception.GetType().Name,
		message = exception.Message,
		stacktrace = exception.StackTrace
	};
	return continuation;
}

AjaxException.cs

public class AjaxException
{
	public string type { get; set; }
	public string message { get; set; }
	public string stacktrace { get; set; }
}

ReportSystemFailure.cs

public class ReportSystemFailure : IActionBehavior
{
	private readonly IActionBehavior _inner;
	private readonly IJsonWriter _writer;
	private readonly ILogger _logger;

	public ReportSystemFailure(IActionBehavior inner, IJsonWriter writer, ILogger logger)
	{
		_inner = inner;
		_writer = writer;
		_logger = logger;
	}

	public void Invoke()
	{
		try
		{
			_inner.Invoke();
		}
		catch (Exception exc)
		{
			_logger.Error(exc.Message, exc);

			var continuation = new AjaxContinuation();
			continuation.SystemFailure(exc);

			_writer.Write(continuation.ToDictionary(), MimeType.Json.ToString());
		}
	}

	public void InvokePartial()
	{
		Invoke();
	}
}