Winform中实现仿XP系统的任务栏菜单效果（附代码下载）

场景

效果

注：

实现

新建一个Form窗体，设计页面布局如下

折叠效果的向上和向下按钮是PictureBox，从上往下依次的Tag标签为1,2,3

三个PictureBox都绑定同一个点击事件，在点击事件中根据传递的Tag标签的值在Switch-case中进行处理。

在Switch-case中分别将对应的一组PictureBox和Panel对象赋值给上面声明的静态的两个控件对象。

下面要隐藏的Panel对象的tag属性默认为0，在上面switch-case中获取一组对应的控件对象后进行判断，

如果Tag为0或者2则是将Panel隐藏，同时将Tag标签设置为1，表示隐藏。

如果是1，则表示已经处于隐藏状态，则会将其显示并将Tag设置为2。

关键代码

private static Panel Var_Panel = new Panel();
        private static PictureBox Var_Pict = new PictureBox();
        private static int Var_i = 0;
        private Font Var_Font = new Font("宋体", 9);

        private void pictureBox_1_Click(object sender, EventArgs e)
        {
            Var_i = Convert.ToInt16(((PictureBox)sender).Tag.ToString());
            switch (Var_i)
            {
                case 1:
                    {
                        Var_Panel = panel_Gut_1;
                        Var_Pict = pictureBox_1;
                        break;
                    }
                case 2:
                    {
                        Var_Panel = panel_Gut_2;
                        Var_Pict = pictureBox_2;
                        break;
                    }
                case 3:
                    {
                        Var_Panel = panel_Gut_3;
                        Var_Pict = pictureBox_3;
                        break;
                    }

            }
            if (Convert.ToInt16(Var_Panel.Tag.ToString()) == 0 || Convert.ToInt16(Var_Panel.Tag.ToString()) == 2)
            {
                Var_Panel.Tag = 1;//隐藏标识
                Var_Pict.Image = null;
                Var_Pict.Image = Properties.Resources.朝下按钮;
                Var_Panel.Visible = false;
            }
            else
            {
                if (Convert.ToInt16(Var_Panel.Tag.ToString()) == 1)
                {
                    Var_Panel.Tag = 2;//显示标识
                    Var_Pict.Image = null;
                    Var_Pict.Image = Properties.Resources.朝上按钮;
                    Var_Panel.Visible = true;
                }
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            pictureBox_1.Image = null;
            pictureBox_1.Image = Properties.Resources.朝上按钮;
            pictureBox_2.Image = null;
            pictureBox_2.Image = Properties.Resources.朝上按钮;
            pictureBox_3.Image = null;
            pictureBox_3.Image = Properties.Resources.朝上按钮;
            Var_Font = label_1.Font;
        }

        private void label_1_MouseEnter(object sender, EventArgs e)
        {
            ((Label)sender).ForeColor = Color.Gray;
            ((Label)sender).Font = new Font(Var_Font, Var_Font.Style | FontStyle.Underline);
        }

        private void label_1_MouseLeave(object sender, EventArgs e)
        {
            ((Label)sender).ForeColor = Color.Black;
            ((Label)sender).Font = new Font(Var_Font, Var_Font.Style);
        }