From cc72e99a240fc8846540a71dc0b4ef0a241a51f0 Mon Sep 17 00:00:00 2001
From: Oleg Shevchenko <oleg.shevchenko@vmedia.ca>
Date: Fri, 11 May 2018 19:35:41 +0300
Subject: [PATCH] Fix post message with new workspace token

---
 SlackAPI/SlackClient.cs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/SlackAPI/SlackClient.cs b/SlackAPI/SlackClient.cs
index c38eba1..0b128d1 100644
--- a/SlackAPI/SlackClient.cs
+++ b/SlackAPI/SlackClient.cs
@@ -598,7 +598,7 @@ public void PostMessage(
             bool unfurl_links = false,
             string icon_url = null,
             string icon_emoji = null,
-            bool as_user = false,
+            bool? as_user = null,
 	    string thread_ts = null)
         {
             List<Tuple<string,string>> parameters = new List<Tuple<string,string>>();
@@ -632,7 +632,8 @@ public void PostMessage(
             if (!string.IsNullOrEmpty(icon_emoji))
                 parameters.Add(new Tuple<string, string>("icon_emoji", icon_emoji));
 
-            parameters.Add(new Tuple<string, string>("as_user", as_user.ToString()));
+            if (as_user.HasValue)
+                parameters.Add(new Tuple<string, string>("as_user", as_user.ToString()));
 		
             if (!string.IsNullOrEmpty(thread_ts))
                 parameters.Add(new Tuple<string, string>("thread_ts", thread_ts));