Summary of the use of ashx files

  This article mainly introduces the use of ashx files. Need friends can come to the reference, I hope to help you.

When it comes to ashx files, we think of HTTP Handler and picture loading (which we typically do with aspx or WebService), as follows:   HANDLER.ASHX:   Code as follows: <%@ WebHandler language= "C #" class= "Handler"%> using System; Using System.IO; Using System.Web; public class Handler:ihttphandler {  public bool IsReusable {  Get {   return true;  }} PU Blic void ProcessRequest (HttpContext context) {  context. Response.ContentType = "Image/jpeg";   context. Response.Cache.SetCacheability (Httpcacheability.public);   context. Response.bufferoutput = false;   Photosize size;   Switch (context. request.querystring["Size"] {   case "S":     Size = Photosize.small     break;   &N Bsp;case "M":     size = Photosize.medium;     break;    case "L":     size = Photosize.large;     break;    default:     size = photosize.original;     break;  }    Int32 id =-1; &nbsP Stream stream = null;   if (context. request.querystring["PhotoID"]!= null && context. request.querystring["PhotoID"]!= "") {   id = Convert.ToInt32 (context. request.querystring["PhotoID"]);    stream = Photomanager.getphoto (id, size);  } else {   id = Convert.ToInt32 (context. request.querystring["albumID"]);    stream = Photomanager.getfirstphoto (id, size);  }   if (stream = null) stream = Photomanager.getphoto (size);   CONST INT buffersize = 1024 * 16;   byte[] buffer = new Byte[buffersize];   int count = stream. Read (buffer, 0, buffersize);   while (Count > 0) {   context. Response.OutputStream.Write (buffer, 0, count);    count = stream. Read (buffer, 0, buffersize);  }}     *.aspx: <img src= "myhttphander.ashx?id=123" width= "" height= "/>  " we modify the following to find that in fact except Can output a picture, but also output text: handler.ashx:     Code as follows: <%@ WebHandler language= "C #"lass= "Handler"%> using System; Using System.Web; public class Handler:ihttphandler {      public void ProcessRequest (HttpContext context) {  &NBSP ;     Context. Response.ContentType = "Text/plain";         context. Response.Write ("Alert (' Hi ')");    }       public bool IsReusable {        get {      &NBSP ;     return false;        }    } {    *.aspx: Pop-up alert <script src= "Handler.ashx" ></script > can also take. ashx as a CSS file <link href= "css/handler.ashx" rel= "stylesheet" type= "Text/css" >   XML File Orderdoc.load ("Handler.ashx");   can also embed text: handler.ashx:   Code as follows: <%@ WebHandler language= "C #" class= "Testhandler"%> using System; Using System.Web; public class Testhandler:ihttphandler {      public void ProcessRequest (HttpContext context) {  & nbsp     Context. RespOnse. ContentType = "Text/plain";         context. Response.Write ("document.write (" Hello World); ");    }           public bool IsReusable {        get {  &NBSP ;         return false;        }    } {    *.aspx: <script type= "Text/javascript src=" Testhandler.a Shx "/>   When you want to access your session from ASHX or HttpHandler, you must implement the Ireadonlysessionstate interface.   Code:   Code is as follows: using System; Using System.Web; Using System.Web.SessionState;   public class Downloadhandler:ihttphandler, ireadonlysessionstate {   public bool IsReusable {get {RE Turn true; }      public void ProcessRequest (HttpContext ctx)    {       CTX. Response.Write (CTX. Session["Fred"]);   &NBSP}}     In fact, the idea of learning should not be like this, in addition to the picture, we have to use the partial, why use the biased, because the software is simple, practical, we just think of the above as a technology without putting it to the status of the software to consider: For specific purposes, we can refer to Rewirte.dll(This DLL, which enables the server to support pseudo static)