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C# 上传生成新图片代码|C#生成图片代码

2010-07-07 15:01 393 查看
public void MakeSmallPic(string oldfile, string newfile,int width,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 = width; 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 { }

}
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