3种方法实现WindowsForm切换窗口

Home home = new Home();
home.Show();

Home home = new Home();
home.ShowDialog();

Home home = new Home();
home.Show();
//home.ShowDialog();
Debug.WriteLine("弹出Home窗口");//使用Show方法时，程序显示窗口后会继续执行输出代码，而ShowDialog只有将显示的窗口关闭后才会继续执行

// 加载登录窗口
private void Form_Container_Load(object sender, EventArgs e)
{
 Login login = new Login();
 login.MdiParent = this;
 login.Show();
}

// 登录实现
private void button1_Click(object sender, EventArgs e)
{
 // 账号密码验证
 // ...
 Home home = new Home();
 home.MdiParent = this.MdiParent;
 home.Show();
}

private void Login_Load(object sender, EventArgs e)
{
 this.FormBorderStyle = FormBorderStyle.None;//将窗口设置无边框模式，即去掉边框和最大化等按钮
 this.WindowState = FormWindowState.Maximized;//将子窗口设置为最大化，即在父容器中起到居中的效果
}

static Form_Container instance;

public static Form_Container Instance
{
 get
 {
  if (instance == null)
  {
   instance = new Form_Container();
  }
  return instance;
 }
}

public void LoadChildPage(Form form)
{
 // 每次加载子窗口的时候关闭其他窗口
 foreach (var item in instance.MdiChildren)
 {
  item.Close();
 }
 form.MdiParent = instance;
 form.Show();
}

Form_Container.Instance.LoadChildPage(new Login());

Form_Container.Instance.LoadChildPage(new Home());

public partial class Form_Container : Form
{
 public Form_Container()
 {
  InitializeComponent();
 }

 static Form_Container instance;

 public static Form_Container Instance
 {
  get
  {
   if (instance == null)
   {
    instance = new Form_Container();
   }
   return instance;
  }
 }

 public Panel PnlContainer
 {
  get { return pnlContainer; }
  set { pnlContainer = value; }
 }

 public void LoadChildPage(Control control)
 {
  PnlContainer.Controls.Clear();
  PnlContainer.Controls.Add(control);
 }

 private void Form_Container_Load(object sender, EventArgs e)
 {
  Form_Container.Instance.LoadChildPage(new UC_Login());
 }
}