#16 inner details

.gitignore

@@ -154,3 +154,4 @@ $RECYCLE.BIN/
 
 # Mac desktop service store files
 .DS_Store
+.vs/

Log4Slack/SlackAppender.cs

@@ -62,6 +62,11 @@ public class SlackAppender : AppenderSkeleton {
         /// </summary>
         public bool AddExceptionTraceField { get; set; }
 
+        /// <summary>
+        /// Indicates whether or not to include the inner exception in the message.
+        /// </summary>
+        public bool AddInnerException { get; set; }
+
         /// <summary>
         /// Indicates whether or not to append the logger name to the Stack username.
         /// </summary>
@@ -120,17 +125,38 @@ protected override void Append(log4net.Core.LoggingEvent loggingEvent) {
                 var exception = loggingEvent.ExceptionObject;
                 if (exception != null) {
                     theAttachment.Fields.Insert(0, new Field("Exception Type", Value: exception.GetType().Name, Short: true));
-                    if (AddExceptionTraceField && !string.IsNullOrWhiteSpace(exception.StackTrace)) {
-                        var parts = exception.StackTrace.SplitOn(1990).ToArray(); // Split call stack into consecutive fields of ~2k characters
+                    if (AddExceptionTraceField && !string.IsNullOrWhiteSpace(exception.StackTrace))
+                    {
+                        var parts = SlackMessageHelper.SplitIntoChunksOf2kChars(exception.StackTrace);
+
                         for (int idx = parts.Length - 1; idx >= 0; idx--) {
                             var name = "Exception Trace" + (idx > 0 ? string.Format(" {0}", idx + 1) : null);
-                            theAttachment.Fields.Insert(0, new Field(name, Value: "```" + parts[idx].Replace("```", "'''") + "```"));
+                            theAttachment.Fields.Insert(0, new Field(name, Value: SlackMessageHelper.FormatAsPre(parts[idx])));
                         }
                     }
 
                     theAttachment.Fields.Insert(0, new Field("Exception Message", Value: exception.Message));
                 }
 
+                if (AddInnerException && exception != null && exception.InnerException != null)
+                {
+                    theAttachment.Fields.Add(new Field("---- Inner Exception ----", Value: string.Empty, Short: false));
+                    theAttachment.Fields.Add(new Field("Inner Exception Type", Value: exception.InnerException.GetType().Name, Short: true));
+                    theAttachment.Fields.Add(new Field("Inner Exception Message", Value: exception.InnerException.Message));
+
+                    if (AddExceptionTraceField && !string.IsNullOrWhiteSpace(exception.InnerException.StackTrace))
+                    {
+
+                        var parts = SlackMessageHelper.SplitIntoChunksOf2kChars(exception.InnerException.StackTrace);
+                        for (int idx = parts.Length - 1; idx >= 0; idx--)
+                        {
+                            var name = "Inner exception Trace" + (idx > 0 ? string.Format(" {0}", idx + 1) : null);
+                            theAttachment.Fields.Add(new Field(name, Value: SlackMessageHelper.FormatAsPre(parts[idx])));
+                        }
+                    }
+
+                }
+
                 attachments.Add(theAttachment);
             }
 
@@ -140,6 +166,20 @@ protected override void Append(log4net.Core.LoggingEvent loggingEvent) {
         }
     }
 
+    internal static class SlackMessageHelper
+    {
+        public static string FormatAsPre(string content)
+        {
+            return $"```{content.Replace("```", "'''")}```";
+        }
+
+        public static string[] SplitIntoChunksOf2kChars(string content)
+        {
+            return content.SplitOn(1990).ToArray();
+        }
+
+    }
+
     internal static class Extensions {
         public static string Expand(this string text) {
             return text != null ? Environment.ExpandEnvironmentVariables(text) : null;

Log4SlackTesting/App.config

@@ -34,6 +34,7 @@
       <IconEmoji value=":ghost:" />
       <AddAttachment value="true" />
       <AddExceptionTraceField value="true" />
+      <AddInnerException value="true" />
       <UsernameAppendLoggerName value="true"/>
       <layout type="log4net.Layout.PatternLayout">
         <conversionPattern value="[TEST] %-5level %logger - %message" />