added Channel.MainUsername helper | simplified GetAllChats example

Examples/Program_GetAllChats.cs

@@ -34,10 +34,10 @@ namespace WTelegramClientTest
 			foreach (var (id, chat) in chats.chats)
 				switch (chat)
 				{
-					case Chat smallgroup when (smallgroup.flags & Chat.Flags.deactivated) == 0:
+					case Chat smallgroup when smallgroup.IsActive:
 						Console.WriteLine($"{id}:  Small group: {smallgroup.title} with {smallgroup.participants_count} members");
 						break;
-					case Channel channel when (channel.flags & Channel.Flags.broadcast) != 0:
+					case Channel channel when channel.IsChannel:
 						Console.WriteLine($"{id}: Channel {channel.username}: {channel.title}");
 						//Console.WriteLine($"              → access_hash = {channel.access_hash:X}");
 						break;

README.md

@@ -129,18 +129,8 @@ using TL;
 var chats = await client.Messages_GetAllChats();
 Console.WriteLine("This user has joined the following:");
 foreach (var (id, chat) in chats.chats)
-    switch (chat) // example of downcasting to their real classes:
+    if (chat.IsActive)
-    {
+        Console.WriteLine($"{id,10}: {chat}");
-        case Chat basicChat when basicChat.IsActive:
-            Console.WriteLine($"{id}:  Basic chat: {basicChat.title}");
-            break;
-        case Channel group when group.IsGroup:
-            Console.WriteLine($"{id}: Group {group.username}: {group.title}");
-            break;
-        case Channel channel:
-            Console.WriteLine($"{id}: Channel {channel.username}: {channel.title}");
-            break;
-    }
 Console.Write("Type a chat ID to send a message: ");
 long chatId = long.Parse(Console.ReadLine());
 var target = chats.chats[chatId];
@@ -149,7 +139,7 @@ await client.SendMessageAsync(target, "Hello, World");
 ```
 
 ➡️ You can find lots of useful code snippets in [EXAMPLES](https://wiz0u.github.io/WTelegramClient/EXAMPLES)
-and in the [Examples subdirectory](https://github.com/wiz0u/WTelegramClient/tree/master/Examples).  
+and more detailed programs in the [Examples subdirectory](https://github.com/wiz0u/WTelegramClient/tree/master/Examples).  
 ➡️ Check [the FAQ](https://wiz0u.github.io/WTelegramClient/FAQ#compile) if example codes don't compile correctly on your machine, or other troubleshooting.
 
 <a name="terminology"></a>

src/TL.Helpers.cs

@@ -216,6 +216,7 @@ namespace TL
 	partial class Channel
 	{
 		public override bool IsActive => (flags & Flags.left) == 0;
+		public string MainUsername => username ?? usernames?.FirstOrDefault(u => u.flags.HasFlag(Username.Flags.active))?.username;
 		public override ChatPhoto Photo => photo;
 		public override bool IsBanned(ChatBannedRights.Flags flags = 0) => ((banned_rights?.flags ?? 0) & flags) != 0 || ((default_banned_rights?.flags ?? 0) & flags) != 0;
 		public override InputPeer ToInputPeer() => new InputPeerChannel(id, access_hash);