c#父子窗体的传值

1，父窗体传值到子窗体：通过子窗体的构造函数；

FORM1：

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        Form2 frm;

        private void Form1_Load(object sender, EventArgs e)
        {
              frm = new Form2();
              //frm.receive += new EventHandler(f2_accept); 

              //
              frm.receive += new EventHandler(
                  (sender1, e1) =>
                  {
                      textBox1.Text = frm.Form2Value;
                  }
                  );

        }

        private void button1_Click(object sender, EventArgs e)
        {
            //Form2 frm = new Form2(textBox1.Text);
            //if (frm.ShowDialog() == DialogResult.OK)
            //{
            //    textBox1.Text = frm.TextBoxValue;
            //    frm.Close();
            //}

            
            frm.Show ( );

        }

        void f2_accept(object sender, EventArgs e)
        {
            //事件的接收者通过一个简单的类型转换得到Form2的引用
            //Form2 f2 = sender as Form2;
            if (frm != null)
            //接收到Form2的textBox1.Text
                this.textBox1.Text = frm.Form2Value;
        }
    }

FORM2：

public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        public Form2(string value)
        {
            InitializeComponent();
            TextBoxValue = value;
        }

        private string textBoxvalue;
        public string TextBoxValue
        {
            //get { return textBox1.Text; }
            //set { textBox1.Text = value; }
            get { return textBoxvalue; }
            set { textBoxvalue = value; }
            //get;
            //set;
        }

        private void Form2_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            //this.DialogResult = DialogResult.OK;
            //textBoxvalue = textBox1.Text;
            //if ( accept != null )
            //{
            //    accept (this , EventArgs.Empty ); //当窗体触发事件，传递自身引用
            //}

            if (receive != null)
            {
                receive(this, EventArgs.Empty);
            }
        }

        public string Form2Value
        {
            get
            {
                return this.textBox1.Text;
            }
            set
            {
                this.textBox1.Text = value;
            }
        }

        public event EventHandler accept;
        public event EventHandler receive;

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            receive(this, EventArgs.Empty);
        }
    }