使用handler"不落地"返回图片信息

<% @ WebHandler Language = " C# "  Class = " Handler "   %>

using  System;
using  System.IO;
using  System.Web;

public   class  Handler : IHttpHandler  {

    public bool IsReusable {
        get {
            return true;
        }
    }
    
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "image/jpeg";
        context.Response.Cache.SetCacheability(HttpCacheability.Public);
        context.Response.BufferOutput = false;
        
        try
        {
            string sno = context.Request.QueryString["sno"];

            byte[] buffer = GetPhoto(sno);

            if (buffer != null)
            {
                context.Response.OutputStream.Write(buffer, 0, buffer.Length);
            }
            else
            {
                context.Response.WriteFile("Images/nophoto.jpg");
            }
        }
        catch (Exception ex){
            context.Response.Write(ex);
        }
    }
}