Fixed bug #515

When include 2 standard columns SpanId and TraceId, AuditTo will throw an exception. The quick solution is adding ToString() for these columns.

Author: vui611

src/Serilog.Sinks.MSSqlServer/Sinks/MSSqlServer/Output/StandardColumnDataGenerator.cs

@@ -51,9 +51,9 @@ public KeyValuePair<string, object> GetStandardColumnNameAndValue(StandardColumn
                 case StandardColumn.Level:
                     return new KeyValuePair<string, object>(_columnOptions.Level.ColumnName, _columnOptions.Level.StoreAsEnum ? (object)logEvent.Level : logEvent.Level.ToString());
                 case StandardColumn.TraceId:
-                    return new KeyValuePair<string, object>(_columnOptions.TraceId.ColumnName, logEvent.TraceId);
+                    return new KeyValuePair<string, object>(_columnOptions.TraceId.ColumnName, logEvent.TraceId.ToString());
                 case StandardColumn.SpanId:
-                    return new KeyValuePair<string, object>(_columnOptions.SpanId.ColumnName, logEvent.SpanId);
+                    return new KeyValuePair<string, object>(_columnOptions.SpanId.ColumnName, logEvent.SpanId.ToString());
                 case StandardColumn.TimeStamp:
                     return GetTimeStampStandardColumnNameAndValue(logEvent);
                 case StandardColumn.Exception: