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5 changes: 3 additions & 2 deletions SlackAPI/SlackClient.cs
Original file line number Diff line number Diff line change
Expand Up @@ -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>>();
Expand Down Expand Up @@ -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));
Expand Down