c#生成自定义图片方法代码实例

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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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