private void Form1_Load(object sender, EventArgs e)

        {

            this.FormClosing += Form1_FormClosing;

        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)

        {

            if (e.CloseReason == CloseReason.UserClosing)

            {

                //是否取消close操作

                e.Cancel = true;

                this.WindowState = FormWindowState.Minimized;

            }

        }