//属于命令SendMessageCommand
private void SendMessage(object obj)
{
selectedChat.ChatLogs.Add(new ChatLog(DateTime.Now, dataService.UserName, textEntered));
if (selectedChat is PrivateChat)
{
string receiver = (selectedChat as PrivateChat).RemoteUser.UserName;
Message msg = new Message(MessageType.PRIV, dataService.UserName, receiver, textEntered);
dataService.SendChatMessage(msg);
}
else
{
string groupNumber = (selectedChat as GroupChat).ChatNumber.ToString();
Message msg = new Message(MessageType.GROUP, dataService.UserName, groupNumber, textEntered);
dataService.SendChatMessage(msg);
}
TextEntered = string.Empty;
}