.Net_简单的图片防盗链

public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "image/jpeg";
        
        //判断当前你上页面 url和当前网站的地址是否是一个域名和端口

        var refUrl = context.Request.UrlReferrer;
        var reuqestUrl = context.Request.Url;
        // http://www.baidu.com/a.aspx
        //http://www.baidu.com/b/a.jpeg;

        if(Uri.Compare(refUrl, reuqestUrl, UriComponents.HostAndPort, UriFormat.SafeUnescaped,
                    StringComparison.CurrentCulture)==0)
        {
            // 当前网站访问我们的图片
            context.Response.WriteFile("DSC_0067-bak.jpg");
        }
        else
        {
            //如果不是
            
            System.Drawing.Bitmap bitmap = new Bitmap(200,200);
            using (Graphics graphics = Graphics.FromImage(bitmap))
            {
                graphics.DrawString("shit",new Font(new FontFamily("黑体"),30 ),new HatchBrush(HatchStyle.Wave, Color.Red),2,2  );
                
                bitmap.Save(context.Response.OutputStream,System.Drawing.Imaging.ImageFormat.Jpeg);
            }
        }
                    
                  
    }