Asp.net(C#)给图片加上水印效果 (转)

转贴自:http://www.cnblogs.com/index/archive/2004/10/20/54498.aspx


private void Btn_Upload_Click(object sender, System.EventArgs e)






{


if(UploadFile.PostedFile.FileName.Trim()!="")






{


//上传文件


string extension = Path.GetExtension(UploadFile.PostedFile.FileName).ToUpper();


string fileName = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString();


string path = Server.MapPath(".") + "/UploadFile/" + fileName + extension;


UploadFile.PostedFile.SaveAs(path);




//加文字水印，注意，这里的代码和以下加图片水印的代码不能共存


System.Drawing.Image image = System.Drawing.Image.FromFile(path);


Graphics g = Graphics.FromImage(image);


g.DrawImage(image, 0, 0, image.Width, image.Height);


Font f = new Font("Verdana", 32);


Brush b = new SolidBrush(Color.White);


string addText = AddText.Value.Trim();


g.DrawString(addText, f, b, 10, 10);


g.Dispose();




//加图片水印


System.Drawing.Image image = System.Drawing.Image.FromFile(path);


System.Drawing.Image copyImage = System.Drawing.Image.FromFile( Server.MapPath(".") + "/Alex.gif");


Graphics g = Graphics.FromImage(image);


g.DrawImage(copyImage, new Rectangle(image.Width-copyImage.Width, image.Height-copyImage.Height, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);


g.Dispose();




//保存加水印过后的图片,删除原始图片


string newPath = Server.MapPath(".") + "/UploadFile/" + fileName + "_new" + extension;


image.Save(newPath);


image.Dispose();


if(File.Exists(path))






{


File.Delete(path);


}




Response.Redirect(newPath);


}


}