C# 根据Combobox控件来动态显示TabControl下的子元素

　　根据下来列表来动态显示TabControl下的元素

    需要准备两个控件：Combobox (命名为：cbPrjType)和 TabControl (命名为：tabPrjType)，TabControl下面有六个子元素分别是:tabPage1,tabPage2,tabPage3,tabPage4,tabPage5,tabPage6

　　我们可以想到加载界面的时候会给cbPrjType绑定元素，代码如下：

        private void InitProjectTypeDic()           //绑定下拉值
        {
            string strMsg = "";
            CorpProjectAddClass cpas = new CorpProjectAddClass();
            dsDic = cpas.GetDicDataSet(out strMsg);     //查询定义的字典表
            if (dsDic.Tables["XMBL_TbProjectTypeDic_SZ"] != null)
            {
                this.cbPrjType.Items.Clear();       //清空集合元素
                this.cbPrjType.Items.Add(new MyItem("", ""));       //为第一个option添加为空
                foreach (DataRow dr in dsDic.Tables["XMBL_TbProjectTypeDic_SZ"].Rows)
                {
                    this.cbPrjType.Items.Add(new MyItem(dr["ProjectTypeNum"].ToString(), dr["ProjectTypeName"].ToString())); 
                }
                this.cbPrjType.DisplayMember = "Name";      //显示的属性(显示)
                this.cbPrjType.ValueMember = "ID";          //选项中实际的值(隐藏)
                this.cbPrjType.SelectedIndex = 0;           //默认选中第一个
            }
        }

　　其次给cbPrjType添加改变下拉事件SelectedIndexChanged：

　　　　 private void cbPrjType_SelectedIndexChanged(object sender, EventArgs e)
        {
            string cbVal="";    //记录当前选中下拉的值 
            if (cbPrjType.SelectedItem != null && (cbPrjType.SelectedItem as MyItem).ID != "")  
                cbVal = (cbPrjType.SelectedItem as MyItem).Name;        //获取选中下拉的值
            else
                return; 

            this.tabPage1.Parent = null;        //指定tabPage1的父元素为空(可实现隐藏作用)
            this.tabPage2.Parent = null;
            this.tabPage3.Parent = null;
            this.tabPage4.Parent = null;
            this.tabPage5.Parent = null;
            this.tabPage6.Parent = null;

            JempType(cbVal);    //传入选中的值，从而判断显示哪个tabPage   
        }

　　根据选中元素的值来进行判断：

　　　　 private void JempType(string prjType)
        {
            switch (prjType)
            {
                case "城市道路工程":
                    this.tabPage1.Text = "城市道路工程";      //tabPage显示的名称
                    this.tabPage1.Parent = tabPrjType;        //给tabPage指定父元素
                    tabPrjType.Enabled = true;          
                    break;

                case "城市桥梁工程":
                    this.tabPage2.Text = "城市桥梁工程";
                    this.tabPage2.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;

                case "排水管道":
                    this.tabPage3.Text = "排水管道";
                    this.tabPage3.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;
                case "供水管道":
                    this.tabPage3.Text = "供水管道";
                    this.tabPage3.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;
                case "中水管道":
                    this.tabPage3.Text = "中水管道";
                    this.tabPage3.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;
                case "燃气管道":
                    this.tabPage3.Text = "燃气管道";
                    this.tabPage3.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;
                case "热力管道":
                    this.tabPage3.Text = "热力管道";
                    this.tabPage3.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;

                case "污水处理厂":
                    this.tabPage4.Text = "污水处理厂";
                    this.tabPage4.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;
                case "供水厂":
                    this.tabPage4.Text = "供水厂";
                    this.tabPage4.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;
                case "给水泵站":
                    this.tabPage4.Text = "给水泵站";
                    this.tabPage4.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;
                case "排水泵站":
                    this.tabPage4.Text = "排水泵站";
                    this.tabPage4.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;
                case "垃圾处理工程":
                    this.tabPage4.Text = "垃圾处理工程";
                    this.tabPage4.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;

                case "城市隧道工程":
                    this.tabPage5.Text = "城市隧道工程";
                    this.tabPage5.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;

                case "公共交通工程":
                    this.tabPage6.Text = "公共交通工程";
                    this.tabPage6.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;
                case "轨道交通工程":
                    this.tabPage6.Text = "轨道交通工程";
                    this.tabPage6.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;
                case "环节卫生工程":
                    this.tabPage6.Text = "环节卫生工程";
                    this.tabPage6.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;
                case "照明工程":
                    this.tabPage6.Text = "照明工程";
                    this.tabPage6.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;
                case "绿化工程":
                    this.tabPage6.Text = "绿化工程";
                    this.tabPage6.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;
                case "电力工程":
                    this.tabPage6.Text = "电力工程";
                    this.tabPage6.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;
                case "通信工程":
                    this.tabPage6.Text = "通信工程";
                    this.tabPage6.Parent = tabPrjType;
                    tabPrjType.Enabled = true;
                    break;
            } 
       
        }

　　如果想循环遍历TabContorl下所有的TextBox控件并赋值为空可以这么写：

    foreach (TabPage page in tabControl1.TabPages)
    {
        foreach (Control control in page.Controls)
        {
             if (control is TextBox)
             {
                 ((TextBox)control) = "";
             }
             if (control is ComboBox)
             {
                 ((ComboBox)control).SelectedIndex = -1;
             }
        }
    }　　

 　　获取选中下拉的问本值：

comboBox1.GetItemText(comboBox1.Items[comboBox1.SelectedIndex]);

　　实现效果如下：