[原创]C#仿QQ聊天程序(点对点无服务端, P2P)

/// <summary>
/// 用户在线列表接口
/// </summary>
public interface IConnectionList
{
   /// <summary>
   /// 批量添加用户列表。
   /// </summary>
   /// <param name="connList"></param>
   void AddConnection(IList connList);
   
   /// <summary>
   /// 添加一个用户连接
   /// </summary>
   /// <param name="conn"></param>
   void AddConnection(ChatConnection conn);
   
   /// <summary>
   /// 在指定位置插入用户连接
   /// </summary>
   /// <param name="position"></param>
   /// <param name="conn"></param>
   void AddConnection(int position, ChatConnection conn);
   
   /// <summary>
   /// 删除一个用户连接
   /// </summary>
   /// <param name="account"></param>
   void RemoveConnection(string account);
   
   /// <summary>
   /// 检查该用户是否在用户列表之中
   /// </summary>
   /// <param name="account"></param>
   /// <returns></returns>
   bool IsConnectionExists(string account);
   
   /// <summary>
   /// 设置指定用户状态
   /// </summary>
   /// <param name="account"></param>
   /// <param name="state"></param>
   void SetConnectionState(string account, ChatState state);
   
   /// <summary>
   /// 当用户接受到消息，用户图标自动闪烁(如QQ那样跳动)
   /// </summary>
   /// <param name="account"></param>
   void FlashConnection(string account);
   
   /// <summary>
   /// 停止跳动
   /// </summary>
   /// <param name="account"></param>
   void StopFlash(string account);
   
   /// <summary>
   /// 关闭所有用户
   /// </summary>
   void CloseAll();
   void CloseAll(bool removeUser);
   
   /// <summary>
   /// 增加接收到的消息，加入到聊天记录文件。
   /// </summary>
   /// <param name="sender"></param>
   /// <param name="message"></param>
   /// <returns></returns>
   int AddReceivedMessage(string sender, string message);
   
   /// <summary>
   /// 返回所有连接
   /// </summary>
   /// <returns></returns>
   IList GetConnections();
   
   /// <summary>
   /// 返回选中的用户
   /// </summary>
   /// <returns></returns>
   ChatConnection GetSelectedConnection();
   
   /// <summary>
   /// 返回指定的用户连接 
   /// </summary>
   /// <param name="account"></param>
   /// <returns></returns>
   ChatConnection GetConnection(string account);
   
   /// <summary>
   /// 显示用户类型(按部门或显示所有用户)
   /// </summary>
   ShowUser ShowUserType { get; set; }
}

/// <summary>
/// 发送消息对话框接口
/// </summary>
public interface ISendMsgProxy
{
   /// <summary>
   /// 给发送消息窗体设置发送人和接收人
   /// </summary>
   /// <param name="from"></param>
   /// <param name="to"></param>
   void SetConnection(ChatConnection from, ChatConnection to);
   
   /// <summary>
   /// 发送消息
   /// </summary>
   /// <param name="msg"></param>
   void SendMessage(string msg);
   
   /// <summary>
   /// 接收人
   /// </summary>
   ChatConnection TargetConnection { get; }
   
   /// <summary>
   /// 发送人
   /// </summary>
   ChatConnection SenderConnection { get; }
   
   /// <summary>
   /// 显示消息
   /// </summary>
   /// <param name="type"></param>
   /// <param name="msg"></param>
   void ShowMessage(ShowMessageType type, string msg);
   void ShowMessage(ShowMessageType type, ArrayList msgList);
   
   /// <summary>
   /// 显示窗体
   /// </summary>
   void ShowMe();
}

/// <summary>
/// 用户资料及用户连线状态信息
/// </summary>
public class ChatConnection
{
   private string _DisplayName = string.Empty; //DisplayName
   private string _Account = string.Empty; //Account
   private string _IP = string.Empty; //联系人地址
   private int _Port = -1;
   private Image _PhotoIcon = null; //头像
   private ChatState _State = ChatState.None;
   private ArrayList _receivedMsg = new ArrayList(); //收到的消息
   private string _FactoryCode = string.Empty;

   /// <summary>
   /// 接受的信息
   /// </summary>
   public ArrayList ReceivedMessage { get { return _receivedMsg; } }
   
   public ChatConnection() { }
   public ChatConnection(string displayName, string account, string factoryCode, string ip, int port, ChatState state)
   {
      _Account = account;
      _DisplayName = displayName;
      _IP = ip;
      _Port = port;
      _State = state;
      _FactoryCode = factoryCode;
   }
   
   /// <summary>
   /// 用户头像
   /// </summary>
   public Image PhotoIcon
   {
      get { return _PhotoIcon; }
      set { _PhotoIcon = value; }
   }
   
   /// <summary>
   /// 连线状态
   /// </summary>
   public ChatState ConnectionState
   {
      get { return _State; }
      set { _State = value; }
   }
   
   /// <summary>
   /// 端口
   /// </summary>
   public int Port
   {
      get { return _Port; }
      set { _Port = value; }
   }
   
   /// <summary>
   /// 显示名称
   /// </summary>
   public string DisplayName
   {
      get { return _DisplayName; }
      set { _DisplayName = value; }
   }
   
   /// <summary>
   /// 用户帐号
   /// </summary>
   public string Account
   {
      get { return _Account; }
      set { _Account = value; }
   }
   
   public string FactoryCode
   {
      get { return _FactoryCode; }
      set { _FactoryCode = value; }
   }
   
   /// <summary>
   /// 用户IP地址
   /// </summary>
   public string IP
   {
      get { return _IP; }
      set { _IP = value; }
   }
   
   public override string ToString()
   {
      return _DisplayName;
   }
   
   /// <summary>
   /// 更新连线资料
   /// </summary>
   /// <param name="conn"></param>
   public void Update(ChatConnection conn)
   {
      this.Account = conn.Account;
      this.ConnectionState = conn.ConnectionState;
      this.DisplayName = conn.DisplayName;
      this.IP = conn.IP;
      this.PhotoIcon = conn.PhotoIcon;
      this.Port = conn.Port;
   }
}

/// <summary>
/// 消息定义基类
/// </summary>
[Serializable]
public class cmdBase { }

//通知好友上线
[Serializable]
public class cmdNotifyOnline : cmdBase
{
   private string _sender = string.Empty;
   public string Sender { get { return _sender; } }
   
   private int _Port = -1;
   public int Port { get { return _Port; } }
   
   private string _IP = string.Empty;
   public string IP { get { return _IP; } }
   
   private string _FactoryCode = string.Empty;
   public string FactoryCode { get { return _FactoryCode; } }
   
   private string _NickName = string.Empty;
   public string NickName { get { return _NickName; } }
   
   public cmdNotifyOnline(string sender, string ip, int port, string factory, string nickName)
   {
      _sender = sender;
      _Port = port;
      _IP = ip;
      _FactoryCode = factory;
      _NickName = nickName;
   }
}

/// <summary>
/// 用户登出时通知所有用户删除连接
/// </summary>
[Serializable]
public class cmdExit : cmdBase
{
   private string _sender = string.Empty;
   public string Sender { get { return _sender; } }
   
   public cmdExit(string sender)
   {
      _sender = sender;
   }
}

/// <summary>
/// 普通消息
/// </summary>
[Serializable]
public class cmdMessage : cmdBase
{
   private string _Content = string.Empty;//消息内容
   private string _Sender = string.Empty;//发送人
   
   public string Content { get { return _Content; } }
   public string Sender { get { return _Sender; } }
   
   public cmdMessage(string sender, string msg)
   {
      _Sender = sender;
      _Content = msg;
   }
}

SQL连接配置：

修改debug\SystemSettings.xml 文件的ConnectionString