C#图片格式（JPG，BMP，PNG，GIF）等转换为ICO图标

using System;

using System.Drawing;

using System.Windows.Forms;

using System.IO;

namespace ICOTest

{

    public partial class Form1 : Form

    {

        string FileName = "C:\\";

        public Form1()

        {

            InitializeComponent();

        }

        //核心代码

        private void button1_Click(object sender, EventArgs e)

        {

            Size size = new Size(32, 32);

            //获得原始图片文件

            using (Bitmap bm = new Bitmap(FileName))

            {

                //从现有图像缩小，为了得到合适的ICO文件

                using (Bitmap iconBm = new Bitmap(bm, size))

                {

                    //如果是windows调用，直接下面一行代码就可以了

                    //此代码不能在web程序中调用，会有安全异常抛出

                    using (Icon icon = Icon.FromHandle(iconBm.GetHicon()))

                    {

                        string Name_ = "C:\\ICO\\" + DateTime.Now.Ticks.ToString() + ".ico";

                        using (Stream stream = new System.IO.FileStream(Name_, System.IO.FileMode.Create))

                        {

                            icon.Save(stream);

                            MessageBox.Show("转换成功。路径是：" + Name_);

                        }

                    }

                }

            }

        }

        private void button2_Click(object sender, EventArgs e)

        {

            openFileDialog1.Filter = "JPG|*.jpg|BMP|*.bmp|PNG|*.png|GIF|*.gif";

            DialogResult D = openFileDialog1.ShowDialog();

            if (D == DialogResult.OK)

            {

                FileName = this.openFileDialog1.FileName.Trim();

                this.textBox1.Text = FileName;

            }

        }

    }

}

 原文地址:http://www.legalsoft.com.cn/docs/1046.html