Fixed some race conditions

src/Discord.Net/DiscordClient.cs

@@ -346,8 +346,8 @@ namespace Discord
         private Channel AddPrivateChannel(ulong id, ulong recipientId)
         {
             Channel channel;
-            if (_privateChannels.TryGetOrAdd(recipientId, x => new Channel(this, id, new User(this, x, null)), out channel))
-                AddChannel(channel);
+            if (_channels.TryGetOrAdd(id, x => new Channel(this, x, new User(this, recipientId, null)), out channel))
+                _privateChannels[recipientId] = channel;
             return channel;
         }
         internal Channel GetPrivateChannel(ulong recipientId)

src/Discord.Net/Extensions.cs

@@ -48,7 +48,21 @@ namespace Discord
                 }
             }
         }
-        
+        public static bool TryGetOrAdd<TKey, TValue>(this ConcurrentDictionary<TKey, TValue> d,
+            TKey key, TValue value, out TValue result)
+        {
+            while (true)
+            {
+                if (d.TryGetValue(key, out result))
+                    return false;
+                if (d.TryAdd(key, value))
+                {
+                    result = value;
+                    return true;
+                }
+            }
+        }
+
         public static IEnumerable<Channel> Find(this IEnumerable<Channel> channels, string name, ChannelType type = null, bool exactMatch = false)
         {
             //Search by name

src/Discord.Net/Models/Server.cs

@@ -205,8 +205,8 @@ namespace Discord
         internal Channel AddChannel(ulong id)
         {
             var channel = new Channel(Client, id, this);
-            channel = _channels.GetOrAdd(id, x => channel);
             Client.AddChannel(channel);
+            channel = _channels.GetOrAdd(id, x => channel);
             return channel;
         }
         internal Channel RemoveChannel(ulong id)
@@ -389,18 +389,19 @@ namespace Discord
         #region Users
         internal User AddUser(ulong id)
         {
-            Member user;
-            if (_users.TryGetOrAdd(id, x => new Member(new User(Client, x, this)), out user))
+            Member member = new Member(new User(Client, id, this));
+            if (id == Client.CurrentUser.Id)
+            {
+                member.User.CurrentGame = Client.CurrentGame;
+                member.User.Status = Client.Status;
+            }
+            
+            if (_users.TryGetOrAdd(id, member, out member))
             {
                 foreach (var channel in AllChannels)
-                    channel.AddUser(user.User);
-                if (id == Client.CurrentUser.Id)
-                {
-                    user.User.CurrentGame = Client.CurrentGame;
-                    user.User.Status = Client.Status;
-                }
+                    channel.AddUser(member.User);
             }
-            return user.User;
+            return member.User;
         }
         internal User RemoveUser(ulong id)
         {