Updates async logging to a newer format

src/Umbraco.Core/Logging/LoggingEventHelper.cs

@@ -0,0 +1,31 @@
+using System;
+using log4net.Core;
+
+namespace Umbraco.Core.Logging
+{
+    /// <remarks>
+    /// Based on https://github.com/cjbhaines/Log4Net.Async
+    /// </remarks>
+    internal class LoggingEventHelper
+    {
+        // needs to be a seperate class so that location is determined correctly by log4net when required
+
+        private static readonly Type HelperType = typeof(LoggingEventHelper);
+        private readonly string loggerName;
+
+        public FixFlags Fix { get; set; }
+
+        public LoggingEventHelper(string loggerName, FixFlags fix)
+        {
+            this.loggerName = loggerName;
+            Fix = fix;
+        }
+
+        public LoggingEvent CreateLoggingEvent(Level level, string message, Exception exception)
+        {
+            var loggingEvent = new LoggingEvent(HelperType, null, loggerName, level, message, exception);
+            loggingEvent.Fix = Fix;
+            return loggingEvent;
+        }
+    }
+}