欢迎您访问我爱IT技术网，今天小编为你分享的编程技术是：【asp.net图片加水印】，下面是详细的分享！
asp.net图片加水印
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;
}
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