Added opcode 8

src/Discord.Net/API/Messages.cs

@@ -125,6 +125,21 @@ namespace Discord.API
 	//Get
 	public sealed class GetMessagesResponse : List<MessageInfo> { }
 
+	//Commands
+	internal sealed class GetUsersCommand : WebSocketMessage<GetUsersCommand.Data>
+	{
+		public GetUsersCommand() : base(8) { }
+		public class Data
+		{
+			[JsonProperty("guild_id")]
+			public string ServerId;
+			[JsonProperty("query")]
+			public string Query;
+			[JsonProperty("limit")]
+			public int Limit;
+		}
+	}
+
 	//Events
 	internal sealed class MessageCreateEvent : MessageInfo { }
 	internal sealed class MessageUpdateEvent : MessageInfo { }

src/Discord.Net/DiscordClient.Users.cs

@@ -182,6 +182,14 @@ namespace Discord
 			return response.Pruned ?? 0;
 		}
 
+		/// <summary>When Config.UseLargeThreshold is enabled, running this command will request the Discord server to provide you with all offline users for a particular server.</summary>
+		public void RequestOfflineUsers(string serverId)
+		{
+			if (serverId == null) throw new ArgumentNullException(nameof(serverId));
+
+			_dataSocket.SendGetUsers(serverId);
+		}
+
 		public Task EditProfile(string currentPassword = "",
 			string username = null, string email = null, string password = null,
 			ImageType avatarType = ImageType.Png, byte[] avatar = null)

src/Discord.Net/Net/WebSockets/DataWebSocket.cs

@@ -141,5 +141,11 @@ namespace Discord.Net.WebSockets
 			leaveVoice.Payload.ServerId = serverId;
 			QueueMessage(leaveVoice);
 		}
+		public void SendGetUsers(string serverId, string query = "", int limit = 0)
+		{
+			var getOfflineUsers = new GetUsersCommand();
+			getOfflineUsers.Payload.ServerId = serverId;
+			QueueMessage(getOfflineUsers);
+		}
 	}
 }