如何避免添加Tabsages我一次又一次点击按钮

问题描述

我有两个按钮，每个按钮都会显示一个带有用户控件的标签页...



一切正常...但是当我点击一个按钮标签页面正在显示，如果我再次按下该按钮，则显示另一个标签页...就像明智的那么多，...我们点击按钮多少次...多次显示标签页面....

i希望控制许多标签页的出现.....我想显示当我点击按钮时已经显示的相同标签...

the我写的代码是

i have two buttons, each of them will display a tab page with an user control...

all are working ok.. but when i click a button the tab page is displaying and if i press that button again another tab page is displaying... like wise so many,.. how many times we click the button... that many times the tab pages are displaying....
i want to control the occurrence of many tab pages..... i want to display the same tab that already displayed when ever i click the button ...
the code i written is

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace ttr
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            tabControl1.Visible = false;

        }

        private void button1_Click(object sender, EventArgs e)
        {
            tabControl1.Visible = true;
            var contentControl = new tta();
            contentControl.Dock = DockStyle.Fill;

            var page = new TabPage("Languages");
            page.Controls.Add(contentControl);
            //tabControl1.TabPages.Clear();
            tabControl1.TabPages.Add(page);
            tabControl1.SelectedTab = page;
            button1.Visible = true;
            button2.Visible = true;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            tabControl1.Visible = true;
            var contentControl = new hhh();
            contentControl.Dock = DockStyle.Fill;

            var page = new TabPage("Education");
            page.Controls.Add(contentControl);
            tabControl1.SelectedTab = page;
            //tabControl1.TabPages.Clear();
            tabControl1.TabPages.Add(page);

            button1.Visible = true;
            button2.Visible = true;




        }
    }
}

推荐答案

//Declare at class level.
TabPage languagesPage = null;
TabPage educationPage = null;

//Put this check before initializing the object. Do the same for other tab too.
if(educationPage == null)
{
    educationPage  = new TabPage("Education");
    page.Controls.Add(contentControl);
    tabControl1.TabPages.Add(page);
}
tabControl1.SelectedTab = educationPage  ;

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