委托：Winform实现窗体间的传值

/// <summary>
        /// 打开发送窗体
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnOpen_Click(object sender, EventArgs e)
        {
            Form2 f2 = new Form2();
            f2.getValueDelegate = GetValue;//将方法赋给委托
            f2.ShowDialog();
        }
        /// <summary>
        /// 值传给窗体的文本框
        /// </summary>
        /// <param name="str"></param>
        void GetValue(string str)
        {
            txtValue.Text = str;
        }

public delegate void GetValueDelegate(string str);//声明委托
        public GetValueDelegate getValueDelegate;//定义委托
        private void btnSend_Click(object sender, EventArgs e)
        {
            if(getValueDelegate!=null)
            {
                getValueDelegate(txtValue.Text);
            }
        }