设置字体和颜色

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace 设置字体和颜色{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void 字体FToolStripMenuItem_Click(object sender, EventArgs e)        {            if (richTextBox1.SelectionFont == null) return;            else this.fontDialog1.Font = this.richTextBox1.SelectionFont;            DialogResult result = this.fontDialog1.ShowDialog();            if (result == DialogResult.OK)                this.richTextBox1.SelectionFont = this.fontDialog1.Font;        }        private void 颜色CToolStripMenuItem_Click(object sender, EventArgs e)        {            this.colorDialog1.Color = this.richTextBox1.SelectionColor;            DialogResult result = this.colorDialog1.ShowDialog();            if (result == DialogResult.OK)                this.richTextBox1.SelectionColor = this.colorDialog1.Color;        }    }}