我对Form.Close（）感到困惑

Question

所以我将Form2中的委托从Form2链接到This_Hide（）函数，然后我将Form3中的委托链接到Form2中的委托（正如我所说的那样链接到Form1中的函数）但我感到困惑的是，尽管Form2处于CLOSED状态仍然有效当我创建Form3的实例时。如果Form.Close（）方法关闭Form2并处理它，Form3中的委托仍然可以从Form2调用函数（委托）..？

    namespace TestingMachine
    {
        public delegate void FxDelegate();

        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 fr2 = new Form2();
                fr2.Delegate_Father_Hide = new FxDelegate(This_Hide);
                fr2.Show();
            }

            public void This_Hide()
            {
                this.Hide();
            }
        }
    }

    namespace TestingMachine
    {
        public partial class Form2 : Form
        {
            public FxDelegate Delegate_Father_Hide;

            public Form2()
            {
                InitializeComponent();
            }

            private void Form2_Load(object sender, EventArgs e)
            {


            }

            private void button1_Click(object sender, EventArgs e)
            {
                Form3 fr3 = new Form3();
                fr3.Delegate_Hide_Grandfather = new FxDelegate(Hide_Grandfather);
                fr3.Show();
                this.Close();

            }

            public void Hide_Grandfather()
            {
                Delegate_Father_Hide();
            }
        }
    }

    namespace TestingMachine
    {
        public partial class Form3 : Form
        {
            public FxDelegate Delegate_Hide_Grandfather;

            public Form3()
            {
                InitializeComponent();
            }

            private void button1_Click(object sender, EventArgs e)
            {
                Delegate_Hide_Grandfather();
            }
        }
    }