大家好，又见面了，我是你们的朋友全栈君。
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();
}
发布者：全栈程序员-站长，转载请注明出处：https://javaforall.net/155665.html原文链接：https://javaforall.net
![SpringBoot❤SpringClould常用注解史诗级汇总[通俗易懂]](https://javaforall.net/wp-content/uploads/2020/11/2020110817443450-480x300.jpg)
