Compare channels by their names

- Talking in #ircdocs, a channel name is unique when server case mapping is applied.
- In short, #abc == #abc, #Abc != #abc

ChatSharp/Handlers/ChannelHandlers.cs

@@ -10,8 +10,8 @@ namespace ChatSharp.Handlers
     {
         public static void HandleJoin(IrcClient client, IrcMessage message)
         {
-            var channel = client.Channels.GetOrAdd(message.Parameters[0]);
             var user = client.Users.GetOrAdd(message.Prefix);
+            var channel = client.Channels.GetOrAdd(message.Parameters[0]);
 
             if (channel != null)
             {

ChatSharp/IrcChannel.cs

@@ -107,5 +107,34 @@ namespace ChatSharp
         {
             Client.ChangeMode(Name, change);
         }
+
+        /// <summary>
+        /// True if this channel is equal to another (compares names).
+        /// </summary>
+        /// <returns></returns>
+        public bool Equals(IrcChannel other)
+        {
+            return other.Name == Name;
+        }
+
+        /// <summary>
+        /// True if this channel is equal to another (compares names).
+        /// </summary>
+        /// <returns></returns>
+        public override bool Equals(object obj)
+        {
+            if (obj is IrcChannel)
+                return Equals((IrcChannel)obj);
+            return false;
+        }
+
+        /// <summary>
+        /// Returns the hash code of the channel's name.
+        /// </summary>
+        /// <returns></returns>
+        public override int GetHashCode()
+        {
+            return Name.GetHashCode();
+        }
     }
 }