使用panel1，切换页面

 

定义变量

UserControl1 urs1_Control;
UserControl2 urs2_Control;
UserControl3 urs3_Control;
UserControl4 urs4_Control;
private void Form1_Load(object sender, EventArgs e)
{
urs1_Control = new UserControl1();  //UserControl1为新建子画面
urs2_Control = new UserControl2();
urs3_Control = new UserControl3();
urs4_Control = new UserControl4();

}

 

按钮中的内容

private void button1_Click(object sender, EventArgs e)
{

var userControl = urs1_Control;
if (panel1.Controls.Count > 0 && panel1.Controls[0] is UserControl1)
{
panel1.Controls[0].Focus();
return;
}

panel1.Controls.Clear();       //panel1为定义的panel
panel1.Controls.Add(userControl);
userControl.Dock = DockStyle.Fill;
userControl.Show();
}