TraceSourceLogger now takes exception into account(adds it to the log message) even if formatter is not null

Author: rizi

src/libraries/Microsoft.Extensions.Logging.TraceSource/src/TraceSourceLogger.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Diagnostics;
+using System.Globalization;
 using DiagnosticsTraceSource = System.Diagnostics.TraceSource;
 
 namespace Microsoft.Extensions.Logging.TraceSource
@@ -35,13 +36,20 @@ public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Except
                 }
                 if (exception != null)
                 {
-                    message += Environment.NewLine + exception;
+                    message += string.Format(CultureInfo.InvariantCulture, "{0}{1}", Environment.NewLine, exception);
                 }
             }
-            if (!string.IsNullOrEmpty(message))
+
+            if (string.IsNullOrEmpty(message) && exception == null)
+                return;
+
+            if (exception != null)
             {
-                _traceSource.TraceEvent(GetEventType(logLevel), eventId.Id, message);
+                string exceptionDelimiter = !string.IsNullOrEmpty(message) ? Environment.NewLine : string.Empty;
+                message += string.Format(CultureInfo.InvariantCulture, "{0}Error: {1}", exceptionDelimiter, exception);
             }
+
+            _traceSource.TraceEvent(GetEventType(logLevel), eventId.Id, message);
         }
 
         public bool IsEnabled(LogLevel logLevel)