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The author:(作者)delv
published in(发表于) 2014/1/16 9:29:11
asp.net生成缩略图及给原始图加水印_[Asp.Net教程]

　　using System.IO;
　　using System.Drawing.Imaging;
　　private void Button1_ServerClick(object sender, System.EventArgs e)
　　{
　　Graphics g=null;
　　System.Drawing.Image upimage=null;
　　System.Drawing.Image thumimg=null;
　　System.Drawing.Image simage=null;
　　Bitmap outputfile=null;
　　try
　　{
　　string extension = Path.GetExtension(File1.PostedFile.FileName).ToUpper();
　　string filename = DateTime.Now.ToString("yyyyMMddhhmmss");
　　string smallpath = Server.MapPath(".")+"/smallimg/";
　　string bigpath = Server.MapPath(".")+"/bigimg/";
　　int width,height,newwidth,newheight;
　　System.Drawing.Image.GetThumbnailImageAbort callb =new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
　　if(!Directory.Exists(smallpath))
　　Directory.CreateDirectory(smallpath);
　　if(!Directory.Exists(bigpath))
　　Directory.CreateDirectory(bigpath);
　　Stream upimgfile = File1.PostedFile.InputStream;
　　string simagefile = Server.MapPath("a8logo.jpg"); //要加水印的文件
　　simage=System.Drawing.Image.FromFile(simagefile);
　　upimage= System.Drawing.Image.FromStream(upimgfile); //上传的图片
　　width = upimage.Width;
　　height = upimage.Height;
　　if(width>height)
　　{
　　newwidth=200;
　　newheight =(int)((double)height/(double)width * (double)newwidth);
　　}
　　else
　　{
　　newheight=200;
　　newwidth=(int)((double)width/(double)height * (double)newheight);
　　}
　　thumimg = upimage.GetThumbnailImage(newwidth,newheight,callb,IntPtr.Zero);
　　outputfile=new Bitmap(upimage);
　　g=Graphics.FromImage(outputfile);
　　g.DrawImage(simage,new Rectangle(upimage.Width-simage.Width,upimage.Height-simage.Height,upimage.Width,upimage.Height),0,0,upimage.Width,upimage.Height,GraphicsUnit.Pixel);
　　string newpath = bigpath + filename + extension; //原始图路径
　　string thumpath = smallpath + filename + extension; //缩略图路径
　　outputfile.Save(newpath);
　　thumimg.Save(thumpath);
　　outputfile.Dispose();
　　}
　　catch(Exception ex)
　　{
　　throw ex;
　　}
　　finally
　　{
　　if(g!=null)
　　g.Dispose();
　　if(thumimg!=null)
　　thumimg.Dispose();
　　if(upimage!=null)
　　upimage.Dispose();
　　if(simage!=null)
　　simage.Dispose();
　　}
　　}
　　public bool ThumbnailCallback()
　　{
　　return false;
　　}

来源:网络

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