c# 如何生成自定义图片？c# 生成自定义图片方法

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using System.Drawing;using System.IO;using System.Drawing.Imaging;using System;namespace treads{    /// <summary>    /// 生成略缩图    /// </summary>    public class Class2    {        private Image srcImage;        private string srcFileName= @"X";//获取图片的路径        private string srcFileName1 = @"x";//要保持图片的新路径        /// <summary>        /// 回调        /// </summary>        /// <returns></returns>        public bool ThumbnailCallback()        {            return false;        }        /// <summary>        /// 保存缩略图        /// </summary>        /// <param name="Width"></param>        /// <param name="Height"></param>        public void SaveThumbnailImage(int Width, int Height)        {            switch (Path.GetExtension(srcFileName).ToLower())            {                case ".png":                    SaveImage(Width, Height, ImageFormat.Png);                    break;                case ".gif":                    SaveImage(Width, Height, ImageFormat.Gif);                    break;                default:                    SaveImage(Width, Height, ImageFormat.Jpeg);                    break;            }        }        /// <summary>        /// 生成缩略图并保存        /// </summary>        /// <param name="Width">缩略图的宽度</param>        /// <param name="Height">缩略图的高度</param>        /// <param name="imgformat">保存的图像格式</param>        /// <returns>缩略图的Image对象</returns>        public void SaveImage(int Width, int Height, ImageFormat imgformat)        {            srcImage = Image.FromFile(srcFileName);            if (imgformat != ImageFormat.Gif && (srcImage.Width > Width) || (srcImage.Height > Height))            {                Image img;                Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);                img = srcImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero);                srcImage.Dispose();                img.Save(srcFileName1, imgformat);                img.Dispose();            }        }    }}

制作网络下载的略缩图

  /// <summary>        /// 制作远程缩略图        /// </summary>        /// <param name="url">图片URL</param>        /// <param name="newFileName">新图路径</param>        /// <param name="maxWidth">最大宽度</param>        /// <param name="maxHeight">最大高度</param>        public static void MakeRemoteThumbnailImage(string url, string newFileName, int maxWidth, int maxHeight)        {            Stream stream = GetRemoteImage(url);            if (stream == null)                return;            Image original = Image.FromStream(stream);            stream.Close();            MakeThumbnailImage(original, newFileName, maxWidth, maxHeight);        }   /// <summary>        /// 获取图片流        /// </summary>        /// <param name="url">图片URL</param>        /// <returns></returns>        private static Stream GetRemoteImage(string url)        {            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);            request.Method = "GET";            request.ContentLength = 0;            request.Timeout = 20000;            HttpWebResponse response = null;            try            {                response = (HttpWebResponse)request.GetResponse();                return response.GetResponseStream();            }            catch            {                return null;            }        } /// <summary>        /// 裁剪图片并保存        /// </summary>        /// <param name="fileName">源图路径（绝对路径）</param>        /// <param name="newFileName">缩略图路径（绝对路径）</param>        /// <param name="maxWidth">缩略图宽度</param>        /// <param name="maxHeight">缩略图高度</param>        /// <param name="cropWidth">裁剪宽度</param>        /// <param name="cropHeight">裁剪高度</param>        /// <param name="X">X轴</param>        /// <param name="Y">Y轴</param>        public static bool MakeThumbnailImage(string fileName, string newFileName, int maxWidth, int maxHeight, int cropWidth, int cropHeight, int X, int Y)        {            byte[] imageBytes = File.ReadAllBytes(fileName);            Image originalImage = Image.FromStream(new System.IO.MemoryStream(imageBytes));            Bitmap b = new Bitmap(cropWidth, cropHeight);            try            {                using (Graphics g = Graphics.FromImage(b))                {                    //设置高质量插值法                    g.InterpolationMode = InterpolationMode.HighQualityBicubic;                    //设置高质量,低速度呈现平滑程度                    g.SmoothingMode = SmoothingMode.AntiAlias;                    g.PixelOffsetMode = PixelOffsetMode.HighQuality;                    //清空画布并以透明背景色填充                    g.Clear(Color.Transparent);                    //在指定位置并且按指定大小绘制原图片的指定部分                    g.DrawImage(originalImage, new Rectangle(0, 0, cropWidth, cropHeight), X, Y, cropWidth, cropHeight, GraphicsUnit.Pixel);                    Image displayImage = new Bitmap(b, maxWidth, maxHeight);                    SaveImage(displayImage, newFileName, GetCodecInfo("image/" + GetFormat(newFileName).ToString().ToLower()));                    return true;                }            }            catch (System.Exception e)            {                throw e;            }            finally            {                originalImage.Dispose();                b.Dispose();            }        }

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