图片处理类

Code

   
     using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
/// <summary>
/// ImageClass 的摘要说明
/// </summary>
namespace ImageClass
{
 public class ImageClass
 {
 public bool ThumbnailCallback()
 {
 return false;
 }
 public void ShowThumbnail(string oldfile, string newfile,int white,int height)
 {
 System.Drawing.Image image = System.Drawing.Image.FromFile(oldfile);
 //获取原图高度和宽度
 int oldh = image.Height;
 int oldw = image.Width;
 int neww, newh;
 neww = white; newh = height; //直接设定新图的高宽,,

 try
 {
 System.Drawing.Image.GetThumbnailImageAbort callb = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
 System.Drawing.Image bt = new System.Drawing.Bitmap(neww, newh);
 System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bt);
 gr.Clear(Color.White);
 gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
 gr.DrawImage(image, new Rectangle(0, 0, neww, newh), 0, 0, oldw, oldh, GraphicsUnit.Pixel);
 switch (oldfile.Substring(oldfile.Length - 3).ToUpper())
 {
 case "JPG":
 bt.Save(newfile, ImageFormat.Jpeg);
 break;
 case "GIF":
 bt.Save(newfile, ImageFormat.Gif);
 break;
 case "PNG":
 bt.Save(newfile, ImageFormat.Png);
 break;
 default:
 bt.Save(newfile, ImageFormat.Jpeg);
 break;
 }
 gr.Dispose();
 bt.Dispose();
 image.Dispose();
 }
 catch { }

 }
 }
}

 

用的时候类似：

  //生成小图
                ImageClass.ImageClass imageClass = new ImageClass.ImageClass();
                imageClass.ShowThumbnail(savePath, savePath1,200,153);