Removed System.Windows.Forms dependancy from Common. Almost done removing NLog dependancy.

MediaBrowser.Logging.NLog/LogHelper.cs

@@ -0,0 +1,90 @@
+using System;
+using System.Text;
+
+namespace MediaBrowser.Logging.Nlog
+{
+    /// <summary>
+    /// Class LogHelper
+    /// </summary>
+    public static class LogHelper
+    {
+        /// <summary>
+        /// Gets the log message.
+        /// </summary>
+        /// <param name="exception">The exception.</param>
+        /// <returns>StringBuilder.</returns>
+        public static StringBuilder GetLogMessage(Exception exception)
+        {
+            var messageText = new StringBuilder();
+
+            messageText.AppendLine(exception.Message);
+
+            messageText.AppendLine(exception.GetType().FullName);
+
+            LogExceptionData(messageText, exception);
+
+            messageText.AppendLine(exception.StackTrace ?? "No Stack Trace Available");
+
+            // Log the InnerExceptions, if any
+            AppendInnerExceptions(messageText, exception);
+
+            messageText.AppendLine(string.Empty);
+
+            return messageText;
+        }
+
+        /// <summary>
+        /// Appends the inner exceptions.
+        /// </summary>
+        /// <param name="messageText">The message text.</param>
+        /// <param name="e">The e.</param>
+        private static void AppendInnerExceptions(StringBuilder messageText, Exception e)
+        {
+            var aggregate = e as AggregateException;
+
+            if (aggregate != null && aggregate.InnerExceptions != null)
+            {
+                foreach (var ex in aggregate.InnerExceptions)
+                {
+                    AppendInnerException(messageText, ex);
+                }
+            }
+
+            else if (e.InnerException != null)
+            {
+                AppendInnerException(messageText, e.InnerException);
+            }
+        }
+
+        /// <summary>
+        /// Appends the inner exception.
+        /// </summary>
+        /// <param name="messageText">The message text.</param>
+        /// <param name="e">The e.</param>
+        private static void AppendInnerException(StringBuilder messageText, Exception e)
+        {
+            messageText.AppendLine("InnerException: " + e.GetType().FullName);
+            messageText.AppendLine(e.Message);
+
+            LogExceptionData(messageText, e);
+
+            if (e.StackTrace != null)
+            {
+                messageText.AppendLine(e.StackTrace);
+            }
+        }
+
+        /// <summary>
+        /// Logs the exception data.
+        /// </summary>
+        /// <param name="messageText">The message text.</param>
+        /// <param name="e">The e.</param>
+        private static void LogExceptionData(StringBuilder messageText, Exception e)
+        {
+            foreach (var key in e.Data.Keys)
+            {
+                messageText.AppendLine(key + ": " + e.Data[key]);
+            }
+        }
+    }
+}