winform切换页面

布局效果如下图：

•  首先在主窗体后台代码声明需要打开的窗体变量，代码如下：

    public partial class Form1 : Form
    {
        Button btnShadow;//作为中间寄存button，用于显示
        Home home;
        Setting setting;
        Record record;
        Query query;
        Statistics statistics;

• 主窗台构造函数内对实例化需要打开的窗体，并进行熟属性设置，代码如下：

        public Form1()
        {
            InitializeComponent();
            //Region = System.Drawing.Region.FromHrgn(CreateRoundRectRgn(0, 0, Width, Height, 25, 25));

            //初始化各窗口
            home = new Home() { TopLevel = false, TopMost = true, Dock = DockStyle.Fill };
            setting = new Setting() { TopLevel = false, TopMost = true, Dock = DockStyle.Fill };
            record = new Record() { TopLevel = false, TopMost = true, Dock = DockStyle.Fill };
            query = new Query() { TopLevel = false, TopMost = true, Dock = DockStyle.Fill };
            statistics = new Statistics() { TopLevel = false, TopMost = true, Dock = DockStyle.Fill };

            //默认进入为主页和主按钮
            LoadWindow(home);
            SelectBarAndBtnShadow(this.button1);
        }

• 创建加载窗体公共方法LoadWindow，具体代码如下：

        private void LoadWindow(Form form)
        {

            this.panel3.Controls.Clear();
            form.FormBorderStyle = FormBorderStyle.None;
            this.panel3.Controls.Add(form);
            form.Show();
        }

• Statistics按钮切换页面的后台代码如下：

        private void button2_Click(object sender, EventArgs e)
        {
            this.lblTitle.Text = "Statistics";
            SelectBarAndBtnShadow(sender);
            LoadWindow(statistics);

        }

• 选中侧边栏菜单是，显示选中状态的效果的代码如下：

        private void SelectBarAndBtnShadow(object btn)
        {
            if (btnShadow != null)
            {
                btnShadow.BackColor = Color.FromArgb(24, 30, 54);
            }

            Button button = (Button)btn;
            this.leftPanel.Height = button.Height;
            this.leftPanel.Top = button.Top;
            this.leftPanel.Left = button.Left;


            btnShadow = button;
            btnShadow.BackColor = Color.FromArgb(46, 51, 73);

        }