public Form1()        {            InitializeComponent();        }        private void 剪切TToolStripMenuItem_Click(object sender, EventArgs e)        {            richTextBox1.Cut();        }        private void 复制CToolStripMenuItem_Click(object sender, EventArgs e)        {            richTextBox1.Copy();        }        private void 粘贴PToolStripMenuItem_Click(object sender, EventArgs e)        {            richTextBox1.Paste();        }        private void 撤消UToolStripMenuItem_Click(object sender, EventArgs e)        {            richTextBox1.Undo();        }        private void 重复RToolStripMenuItem_Click(object sender, EventArgs e)        {            richTextBox1.Redo();        }        private void 全选AToolStripMenuItem_Click(object sender, EventArgs e)        {            richTextBox1.SelectAll();        }        private void toolStripStatusLabel2_Click(object sender, EventArgs e)        {                    }        private void 自动换行ToolStripMenuItem_Click(object sender, EventArgs e)        {            if (richTextBox1.WordWrap)            {                自动换行ToolStripMenuItem.Checked = false;                richTextBox1.WordWrap = false;                toolStripStatusLabel4.Text = "1";                toolStripStatusLabel6.Text = richTextBox1.TextLength.ToString();            }            else            {                自动换行ToolStripMenuItem.Checked = true;                richTextBox1.WordWrap = true;            }        }        private void richTextBox1_TextChanged(object sender, EventArgs e)        {            toolStripStatusLabel2.Text = richTextBox1.TextLength.ToString();//字符数            toolStripStatusLabel4.Text = richTextBox1.Lines.Length.ToString();//行号                       toolStripStatusLabel6.Text = (richTextBox1.SelectionStart - richTextBox1.GetFirstCharIndexOfCurrentLine()).ToString();//焦点所在列数        }        private void richTextBox1_Click(object sender, EventArgs e)        {            toolStripStatusLabel6.Text = (richTextBox1.SelectionStart - richTextBox1.GetFirstCharIndexOfCurrentLine()).ToString();//焦点所在列数                        int index = richTextBox1.GetFirstCharIndexOfCurrentLine();//GetFirstCharIndexOfCurrentLine()当前行第一个字符的索引            //GetLineFromCharIndex(index)指定位置的索引行号            toolStripStatusLabel4.Text = (richTextBox1.GetLineFromCharIndex(index) + 1).ToString();//焦点所在行号        }