上位机开发中，经常会需要将子窗体嵌入到主窗体。

运行结果

核心实现：

        private void button2_Click(object sender, EventArgs e)
        {
            Form3 childForm = new Form3();
            //判断容器中是否已经打开子窗体，如果打开现将其关闭
            foreach (Control item in this.splitContainer1.Panel2.Controls)
            {
                if (item is Form)
                {
                    ((Form)item).Close();
                    Console.WriteLine("找到以前的窗体并关闭");
                }
            }
            childForm.TopLevel = false;//将子窗体设置成非顶级控件
            childForm.FormBorderStyle = FormBorderStyle.None;//如果是带边框的窗体，需要去掉窗体边框；
            childForm.Parent = this.splitContainer1.Panel2;
            childForm.Dock = DockStyle.Fill;//设置随着容器的大小自动调整窗体大小；
            childForm.Show();
        }

代码提炼优化为通用方法

public void OpenForm(Form childForm)//按钮事件调用通用方法
{
    if (childForm == null)
    {
        return;
    }

    //Form2 childForm = new Form2();
    //判断容器中是否已经打开子窗体，如果打开现将其关闭
    foreach (Control item in this.splitContainer1.Panel2.Controls)
    {
        if (item is Form)
        {
            ((Form)item).Close();
            Console.WriteLine("找到以前的窗体并关闭");
        }
    }
    childForm.TopLevel = false;//将子窗体设置成非顶级控件
    childForm.FormBorderStyle = FormBorderStyle.None;//如果是带边框的窗体，需要去掉窗体边框；
    childForm.Parent = this.splitContainer1.Panel2;
    childForm.Dock = DockStyle.Fill;//设置随着容器的大小自动调整窗体大小；
    childForm.Show();
}

调用方法

private void button3_Click(object sender, EventArgs e)
{
    OpenForm(new Form2());
}

 完整

代码如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {

        }
        private void button1_Click(object sender, EventArgs e)
        {
            Form2 childForm = new Form2();
            //判断容器中是否已经打开子窗体，如果打开现将其关闭
            foreach (Control item in this.splitContainer1.Panel2.Controls)
            {
                if (item is Form)
                {
                    ((Form)item).Close();
                    Console.WriteLine("找到以前的窗体并关闭");
                }
            }
            childForm.TopLevel = false;//将子窗体设置成非顶级控件
            childForm.FormBorderStyle = FormBorderStyle.None;//如果是带边框的窗体，需要去掉窗体边框；
            childForm.Parent = this.splitContainer1.Panel2;
            childForm.Dock = DockStyle.Fill;//设置随着容器的大小自动调整窗体大小；
            childForm.Show();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Form3 childForm = new Form3();
            //判断容器中是否已经打开子窗体，如果打开现将其关闭
            foreach (Control item in this.splitContainer1.Panel2.Controls)
            {
                if (item is Form)
                {
                    ((Form)item).Close();
                    Console.WriteLine("找到以前的窗体并关闭");
                }
            }
            childForm.TopLevel = false;//将子窗体设置成非顶级控件
            childForm.FormBorderStyle = FormBorderStyle.None;//如果是带边框的窗体，需要去掉窗体边框；
            childForm.Parent = this.splitContainer1.Panel2;
            childForm.Dock = DockStyle.Fill;//设置随着容器的大小自动调整窗体大小；
            childForm.Show();
        }

        
        public void OpenForm(Form childForm)//按钮事件调用通用方法
        {
            if (childForm == null)
            {
                return;
            }

            //Form2 childForm = new Form2();
            //判断容器中是否已经打开子窗体，如果打开现将其关闭
            foreach (Control item in this.splitContainer1.Panel2.Controls)
            {
                if (item is Form)
                {
                    ((Form)item).Close();
                    Console.WriteLine("找到以前的窗体并关闭");
                }
            }
            childForm.TopLevel = false;//将子窗体设置成非顶级控件
            childForm.FormBorderStyle = FormBorderStyle.None;//如果是带边框的窗体，需要去掉窗体边框；
            childForm.Parent = this.splitContainer1.Panel2;
            childForm.Dock = DockStyle.Fill;//设置随着容器的大小自动调整窗体大小；
            childForm.Show();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            OpenForm(new Form2());
        }

        private void button4_Click(object sender, EventArgs e)
        {
            OpenForm(new Form3());
        }

        private void button5_Click(object sender, EventArgs e)
        {
            Form2 fm2 = new Form2();
            OpenForm(fm2);
        }
        
        private void button6_Click(object sender, EventArgs e)
        {
            Form3 fm3 = new Form3();
            OpenForm(fm3);
        }
    }
}

代码下载：

【免费】C#中在主窗体的某个容器中打开子窗体的方法资源-CSDN文库https://download.csdn.net/download/anlog/89363912

参考链接：

C#知识|上位机子窗体嵌入主窗体方法（实例） (qq.com)https://mp.weixin.qq.com/s?__biz=MzU4MzgyMDEzOA==&mid=2247486750&idx=1&sn=c6eb7c358c4034c03bb9e768aef70413&chksm=fda27b1bcad5f20d15abae895e50b336366bf58fe0a0350126cbaf3409350bac7845407e1bef&mpshare=1&scene=1&srcid=05262aK0RkJdJaBcUxjNEd5Z&sharer_shareinfo=214d0d5572caabea801daa11554170a3&sharer_shareinfo_first=5c9166718e80955786a42b0207e83e1f#rd

C# WinForm:无法访问已释放的对象 - asdyzh - 博客园 (cnblogs.com)https://www.cnblogs.com/asdyzh/p/9902520.html 

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anlog

2024年5月27日