private void Main_FormClosed(object sender, FormClosedEventArgs e)

        {

            if(baocun==false)

            {

                if(richTextBox1.Text!="")

                {

                    string msg = "当前文本内容不为空，是否保存";



                    if (baocun == false && filepath != "")

                        msg = "内容已经发生变化，是否保存";



                    switch (MessageBox.Show(msg,"警告",MessageBoxButtons.YesNoCancel))

                    {

                        case DialogResult.Yes:

                            if(SaveFile())

                            {

                                Application.Exit();

                            }

                            break;

                        case DialogResult.No:

                            e.Cancel = false;

                            break;

                        case DialogResult.Cancel:

                            e.Cancel = true;

                            break;



                    }

                }

&n