GDI生成图片

    //引入命名空间

     //using System.Drawing;
     //using System.Drawing.Drawing2D;
     //using System.Drawing.Imaging;

     

      //实例化Bitmap
        Bitmap image = new Bitmap(300, 50);
        //从bitmap实例创建Graphics实例
        Graphics graphics = Graphics.FromImage(image);
        //以黑色填充图片
        graphics.Clear(Color.Black);
        //定义绘制文字的字体和大小
        Font font = new Font("宋体", 16);
        //定义绘制文字的颜色
        Brush brush = new SolidBrush(Color.White);
        //绘制文字
        graphics.DrawString("励志工作室", font, brush, 0, 0);
        //释放Graphics对象
        graphics.Dispose();
        Response.Clear();
        Response.ContentType = "image/pjpeg";
        //将图片保存到Response的输出流中
        image.Save(Response.OutputStream, ImageFormat.Jpeg);
           //写入到Response输出流中
        image.Dispose();
        Response.End();