制作一个具有私聊功能的聊天室

制作一个具有私聊功能的聊天室

例6.10  在聊天室中，几个网友一起聊天时，总会有一些话题不想被同一聊天室内别的聊友看见，因此聊天室必须设置私聊的功能，如图6.12所示。

（点击查看大图）图6.12  具有私聊功能聊天室

在6.3.4节中已经制作了一个简单的聊天室，在此基础上设计一个具有私聊功能的聊天室。程序实现的主要步骤：（实例位置：光盘\TM\Instances\06\ch10）

（1）在显示聊天信息页Bottom.aspx中，再添加一个TextBox控件，用来显示私聊信息；在Default.aspx中，再添加一个CheckBox控件，用来区分聊天信息为私聊还是群聊。

（2）主要程序代码如下。

为了实现私聊功能，需要修改Global.axax文件，在文件中加入如下代码。

void Application_Start(object sender, EventArgs e)
   {
      //在应用程序启动时运行的代码
      //建立用户列表
      string user="";//用户列表
      Application["user"] = user;
      Application["userNum"] = 0;
      string chats = "";//聊天记录
      Application["chats"] = chats;
      //当前的聊天记录数
      Application["current"] = 0;
      string receive = "";//接受列表
      Application["receive"] = receive;
      string Owner = "";//发送列表
      Application["Owner"] = Owner;
      string chat = "";//私聊内容列表
      Application["chat"] = chat;
      Application["chatnum"] = 0; //私聊内容的当前记录数
      string chattime = "";//私聊信息发送时间
      Application["chattime"] = chattime;
   }

（3）进入添加聊天信息页面Bottom.aspx，当用户输入聊天信息并选中"私聊"复选框后，单击"我要发言"按钮，在"我要发言"按钮的Click事件下将发送者、接收者、发送时间、聊天内容这4项信息保存在Application对象中，其代码如下。

protected void  Button1_Click(object sender, EventArgs e)
     {
        Application.Lock( );
        string strTxt = TextBox2.Text.ToString( );
        int intintChatNum = int.Parse(Application["chatnum"].ToString ( ));
        if (CheckBox1.Checked)
        {
          //处理私聊内容
          if (intChatNum == 0 || intChatNum > 40)
          {
            intChatNum = 0;
            Application["chat"] = strTxt.ToString( );
            Application["Owner"] = Session["user"];
            Application["chattime"] = DateTime.Now;
            Application["receive"] = DropDownList1.SelectedValue.ToString( );
          }
          else
          {
            Application["chat"] = Application["chat"] + "," + strTxt.ToString( );
            Application["Owner"] = Application["Owner"] + "," + Session["user"];
            Application["chattime"] = Application["chattime"] + "," + DateTime.Now;
            Application["receive"] = Application["receive"] + "," + DropDownList1.SelectedValue.ToString( );
            }
            intChatNum += 1;
            object obj = intChatNum;
            Application["chatnum"] = obj;
        }
        else
        {
           //处理公共聊天内容
           int intintcurrent = int.Parse(Application["current"].ToString( ));
           if (intcurrent == 0 || intcurrent >40)
           {
              intcurrent = 0;
                Application["chats"] =Session["user"].ToString( ) + "对" + DropDownList1.SelectedValue.ToString( ) + "说：" + strTxt.T oString( )+"("+ DateTime.Now.ToString( )+")" ;
            }
            else
            {
                 Application["chats"] = Application["chats"].ToString( ) + "," + Session["user"].ToString( ) + "对" +DropDownList 1.SelectedValue.ToString( ) + "说：" + strTxt.ToString( ) + "(" + DateTime.Now.ToString( ) + ")";

            }
            intcurrent +=1;
            object obj = intcurrent;
            Application["current"] = obj;
         }
         Application.UnLock( );
         //刷新聊天页面
         Response.Write("<script language=javascript>");
         Response.Write("this.parent.right.location.reload( )");
         Response.Write("</script>");
     }

（4）进入显示聊天信息页面right.aspx，当页面加载时，从Application对象中读取保存聊天信息，将所有的聊天记录显示在页面中，代码如下。

protected void Page_Load(object sender, EventArgs e)
   {
      Application.Lock( );
      string OwnerName=Session["user"].ToString( );
      if (!IsPostBack)
      {
         //私聊、发送、接收
         string Owner = Application["Owner"].ToString( );
         string[] Ownsers = Owner.Split(',');
         string receive = Application["receive"].ToString( );
         string[] receivereceives = receive.Split(',');
         string chat=Application["chat"].ToString( );
         string [] chatchats=chat.Split(',');
         string chattime=Application["chattime"].ToString( );
         string[] chattimechattimes=chattime.Split(',');
         for (int i = (Ownsers.Length - 1); i>=0 ; i--)
         {
            if (OwnerName.Trim( ) == Ownsers[i].Trim( ))
            {
              //发送
              TextBox2TextBox2.Text = TextBox2.Text + "\n" + "您悄悄地对" + receives[i].ToString( ) + "说：" + chats[i].ToString( ) + "("+chattimes[i].ToString( )+")";
            }
            else
            {
              if (OwnerName.Trim( ) == receives[i].Trim( ))
              {
                //接收
                  TextBox2TextBox2.Text = TextBox2.Text + "\n"  + Ownsers[i].ToString( ) + "悄悄地对您说：" + chats[i].ToString( ) + "(" + chattimes[i].ToString( ) + ")";

               }
            }

         }
         //公聊
         int intintcurrent = int.Parse(Application["current"].ToString( ));
         string strchat = Application["chats"].ToString( );
         string[] strchatstrchats = strchat.Split(',');
         for (int i = (strchats.Length - 1); i >= 0; i--)
         {
            if (intcurrent == 0)
            {
              TextBox1.Text =strchats[i].ToString( );
            }
            else
            {
              TextBox1TextBox1.Text = TextBox1.Text + "\n" + strchats[i].ToString( );
            }

         }

      }
      Application.UnLock( );
   }