winform 记事本 剪切 粘贴 全选 撤销

private void 撤消UToolStripMenuItem_Click(object sender, EventArgs e)
        {
            textBox1.Undo();
        }

        private void 剪切TToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (textBox1.SelectionLength>0)
            {
                textBox1.Cut();
            }
        }

        private void 复制CToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (textBox1.SelectionLength > 0)
            {
                textBox1.Copy();
            }
        }

        private void 粘贴PToolStripMenuItem_Click(object sender, EventArgs e)
        {
            textBox1.Paste();
        }

        private void 全选AToolStripMenuItem_Click(object sender, EventArgs e)
        {
            textBox1.SelectAll();
        }