C# フォーム並べて追随させる

あまり使い道はないが、たまにこういう挙動を見かけることもある。

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 Test
{
    public partial class Form1 : Form
    {
        Form f = null;

        public Form1()
        {
            InitializeComponent();

            f = new Form2();
            
            f.FormClosed += new FormClosedEventHandler((object sender,FormClosedEventArgs e)=> { this.Close(); });
            f.Shown += new EventHandler((object sender, EventArgs e) => {
                f.Left = this.Left + this.Width;
                f.Top = this.Top;
                f.Height = this.Height;
                f.Width = this.Width;
            });
            f.Show();

        }
        private void Form1_ResizeEnd(object sender, EventArgs e)
        {
            f.Left = this.Left + this.Width;
            f.Top = this.Top;
            f.Height = this.Height;
            f.Width = this.Width;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ((Button)f.Controls["button1"]).Text = "hello world";
        }
    }
}

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 Test

{

public partial class Form1 : Form

{

Form f = null;

public Form1()

{

InitializeComponent();

f = new Form2();

f.FormClosed += new FormClosedEventHandler((object sender,FormClosedEventArgs e)=> { this.Close(); });

f.Shown += new EventHandler((object sender, EventArgs e) => {

f.Left = this.Left + this.Width;

f.Top = this.Top;

f.Height = this.Height;

f.Width = this.Width;

});

f.Show();

}

private void Form1_ResizeEnd(object sender, EventArgs e)

{

f.Left = this.Left + this.Width;

f.Top = this.Top;

f.Height = this.Height;

f.Width = this.Width;

}

private void button1_Click(object sender, EventArgs e)

{

((Button)f.Controls["button1"]).Text = "hello world";

}