c#记事本文本文档

记事本 private void 新建ToolStripMenuItem_Click(object sender, EventArgs e) { if (b == true ||richTextBox1.Text != "") { if (s == false) { string sr; sr = MessageBox.Show("文件还没有保存,是否保存", "记事本,操作提示", MessageBoxButtons.YesNoCancel).ToString(); switch (sr) { case "Yes": if (b == true) { richTextBox1.SaveFile(openFileDialog1.FileName, RichTextBoxStreamType.PlainText); } else if (saveFileDialog1.ShowDialog() == DialogResult.OK) { richTextBox1.SaveFile(openFileDialog1.FileName, RichTextBoxStreamType.PlainText); } s = true; break; case "No": b = false; richTextBox1.Text = ""; break; default: break; } } else { b = false; richTextBox1.Clear(); } } }