Question

any generic way to trace/log values of all local variables when an exception occurs in a method? (in C# 3)

Answer 1

Answer: Using PostSharp (Policy Injection), XTraceMethodBoundary attribute, override OnException . this logs all the method input and return parameters types and values. I modified PostSharp to add a simple method to log parameters. not perfect but good enough

private static void TraceMethodArguments(MethodExecutionEventArgs eventArgs) {     object[] parameters = eventArgs.GetReadOnlyArgumentArray();      if (parameters != null)     {         string paramValue = null;         foreach (object p in parameters)         {             Type _type = p.GetType();             if (_type == typeof(string) || _type == typeof(int) || _type == typeof(double) || _type == typeof(decimal))             {                 paramValue = (string)p;             }             else if (_type == typeof(XmlDocument))             {                 paramValue = ((XmlDocument)p).OuterXml;             }             else             { //try to serialize                 try                 {                     XmlSerializer _serializer = new XmlSerializer(p.GetType());                     StringWriter _strWriter = new StringWriter();                      _serializer.Serialize(_strWriter, p);                     paramValue = _strWriter.ToString();                 }                 catch                 {                     paramValue = 'Unable to Serialize Parameter';                 }             }             Trace.TraceInformation('[' + Process.GetCurrentProcess().Id + '-' + Thread.CurrentThread.ManagedThreadId.ToString() + ']' + ' Parameter: ' + paramValue);         }     } }