form1.cs

[Visual C# 2005程序设计基础教程] 全部的源码！非常经典

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace ColorSetting
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ColorDialog colorDialog = new ColorDialog();   //实例化ColorDialog类对象
            colorDialog.AllowFullOpen = true;             //设置ColorDialog类对象相关属性
            colorDialog.FullOpen = true;
            colorDialog.ShowHelp = true;
            //初始化当前文本框中的字体颜色，当用户在ColorDialog对话框中点击"取消"按钮
            //恢复原来的值
            colorDialog.Color = Color.Black;
            colorDialog.ShowDialog();
            //获取当前选择的Color值，应用到RichTextBox控件中
            richTextBox1.SelectionColor = colorDialog.Color;　

        }
    }
}