/// <summary>
/// 获得缩微图
/// </summary>
/// <returns></returns>
public bool GetThumbImg() {
try {
string imgpath;
//原始路径 if(imgsourceurl.IndexOf("\",0)<0)
//使用的是相对路径
{ imgpath = HttpContext.Current.Server.MapPath(imgsourceurl);
//转化为物理路径
} else { imgpath=imgsourceurl; }
System.Drawing.Image sourceImage = System.Drawing.Image.FromFile(imgpath);
int width = sourceImage.Width;
int height = sourceImage.Height;
if(thumbwidth <= 0) { thumbwidth = 120; }
if(thumbwidth >= width) { return false; }
else { (thumbwidth,thHeight*thumbwidth/thWidth,null,IntPtr.Zero);
Image imgThumb=new System.Drawing.Bitmap(thumbwidth,height*thumbwidth/width); System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(imgThumb); g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; g.DrawImage(sourceImage, new Rectangle(0, 0, thumbwidth,height*thumbwidth/width), 0, 0, width, height, GraphicsUnit.Pixel);
string thumbpath="";
sourceImage.Dispose();
if(thumburl=="") { thumbpath=imgpath; }
if(thumbpath.IndexOf("\",0)<0)
//使用的是相对路径
{ thumbpath=HttpContext.Current.Server.MapPath(thumburl);//转化为物理路径
}
imgThumb.Save(thumbpath,ImageFormat.Jpeg);
imgThumb.Dispose();
return true; }
}