c#生成自定义图片方法代码实例

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();      }    }   }}

/// <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();     }   }