请问在GDI中用C#绘图的时候该怎么通过comboBox控件（如图）改变画笔的颜色？

Question

通过选择不同的颜色，使得线条的颜色发生改变或者用其他的菜单选项来改变画笔的颜色

Answer 1

一个简单例子

using System;using System.Windows.Forms;using System.Drawing; namespace WindowsFormsApplication1{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();            // 添加颜色            comboBox1.DropDownStyle = ComboBoxStyle.DropDownList;            comboBox1.Items.Add(new ColorName() { Color = Color.Red, Name = "红色" });            comboBox1.Items.Add(new ColorName() { Color = Color.Green, Name = "绿色" });            comboBox1.Items.Add(new ColorName() { Color = Color.Blue, Name = "蓝色" });            comboBox1.SelectedIndex = 0;        }         private void Form1_Paint(object sender, PaintEventArgs e)        {            Graphics g = e.Graphics;            // 用指定颜色做直线            ColorName colorName =(ColorName)comboBox1.SelectedItem;            Brush brush = new SolidBrush(colorName.Color);            Pen pen = new Pen(brush, 3);            g.DrawLine(pen, new Point(10, 60), new Point(200, 60));        }         private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)        {            this.Refresh();        }    }              //颜色--名称类，用于ComboBox表示颜色    class ColorName    {        public Color Color;        public string Name;                 public override string ToString()        {            return Name;        }    }}