c#的richtextbox左对齐、右对齐、居中（段落对齐）

1.左对齐
private void 左对齐ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            richTextBox1.SelectionAlignment=HorizontalAlignment.Left;
            //richtextbox选中段落的对齐方式=左对齐
        }
``

2.右对齐

 private void 右对齐ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            richTextBox1.SelectionAlignment = HorizontalAlignment.Right;
        }

3.居中

private void 居中ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            richTextBox1.SelectionAlignment = HorizontalAlignment.Center;
        }