Add copyright information to the image in Asp.net

Abstract: http://dev.csdn.net/author/starchenzhi/506a6b59aaa04542ae1df3c007184a36.html

Using system. drawing;
Using system. IO;
Using system. Drawing. imaging;

Private void addtexttoimg (string filename, string text)
{
If (! File. exists (mappath (filename )))
{
Throw new filenotfoundexception ("the file don't exist! ");
}

If (text = string. Empty)
{
Return;
}
// You also need to determine whether the file type is of the image type. I will not go into details here.

System. Drawing. Image image = system. Drawing. image. fromfile (mappath (filename ));
Bitmap bitmap = new Bitmap (image, image. Width, image. Height );
Graphics G = graphics. fromimage (Bitmap );

Float fontsize = 12.0f; // font size
Float textwidth = text. length * fontsize; // the length of the text.
// The following defines a rectangle area, and then draws black characters on the rectangle.
Float rectx = 0;
Float recty = 0;
Float rectwidth = text. length * (fontsize + 8 );
Float rectheight = fontsize + 8;
// Declare the rectangular Field
Rectanglef textarea = new rectanglef (rectx, recty, rectwidth, rectheight );

Font font = new font ("", fontsize); // define the font
Brush whitebrush = new solidbrush (color. White); // white brush, used to draw text
Brush blackbrush = new solidbrush (color. Black); // black brush for background painting

G. fillrectangle (blackbrush, rectx, recty, rectwidth, rectheight );

G. drawstring (text, Font, whitebrush, textarea );
Memorystream MS = new memorystream ();
// Save as JPG
Bitmap. Save (MS, imageformat. JPEG );

// Output the processed image. For demonstration convenience, I will display the image on the page
Response. Clear ();
Response. contenttype = "image/JPEG ";
Response. binarywrite (Ms. toarray ());

G. Dispose ();
Bitmap. Dispose ();
Image. Dispose ();
}

It's easy to call,
Addtexttoimg ("me.jpg", "Xiaozhi ");