在Asp.net中为图像加入版权信息

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;

}

//还需要判断文件类型是否为图像类型，这里就不赘述了

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; //字体大小

float textWidth = text.Length*fontSize; //文本的长度

//下面定义一个矩形区域，以后在这个矩形里画上白底黑字

float rectX = 0;

float rectY = 0;

float rectWidth = text.Length*(fontSize+8);

float rectHeight = fontSize+8;

//声明矩形域

RectangleF textArea = new RectangleF(rectX,rectY,rectWidth,rectHeight);

Font font = new Font("宋体",fontSize); //定义字体

Brush whiteBrush = new SolidBrush(Color.White); //白笔刷，画文字用

Brush blackBrush = new SolidBrush(Color.Black); //黑笔刷，画背景用

g.FillRectangle(blackBrush,rectX,rectY,rectWidth,rectHeight);

g.DrawString(text,font,whiteBrush,textArea);

MemoryStream ms = new MemoryStream( );

//保存为Jpg类型

bitmap.Save(ms,ImageFormat.Jpeg);

//输出处理后的图像，这里为了演示方便，我将图片显示在页面中了

Response.Clear();

Response.ContentType = "image/jpeg";

Response.BinaryWrite( ms.ToArray() );

g.Dispose();

bitmap.Dispose();

image.Dispose();

}

调用时很简单，

AddTextToImg("me.jpg","小李");

一切OK了，感觉.net确实好强大，这些功能在Asp中可是奢侈品了，而在.Net环境中却能轻而易举的完成！